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Патент США №	10749270
Автор(ы)	Behdad и др.
Дата выдачи	18 августа 2020 г.

Polarization rotating phased array element

"Элемент фазированной решетки с вращающейся поляризацией"

РЕФЕРАТ

A phase shifter includes a first dielectric layer, a switch mounted to the first dielectric layer, a conductive layer mounted to the first dielectric layer, a second dielectric layer mounted to the conductive layer, a conducting pattern layer mounted to the second dielectric layer, and a plurality of vias. The switch is switchable between a first conducting position and a second conducting position. Each via is connected between a first or a second throw arm of the switch and a conductor of the conducting pattern layer. When an electromagnetic wave incident on the phase shifter is reflected, an electric polarization of the reflected electromagnetic wave is rotated by .+-.90 degrees compared to an electric polarization of the incident electromagnetic wave based on a conducting position of the switch. The phase shifter can be used as one-bit spatial phase shifter to provide either 0.degree. or 180.degree. phase shift over wide bandwidths.

Автор(ы):

Nader Behdad (Oregon, WI), Zhe Yang (Madison, WI), John H. Booske (McFarland, WI), Hung Thanh Luyen (Madison, WI)

Заявитель:

Наименование	Город	Штат	Страна	Тип
Wisconsin Alumni Research Foundation	Madison	WI	US

Патентообладатель:

Wisconsin Alumni Research Foundation (Madison, WI)

Идентификатор семейства:

68464255

Номер заявки:

15/977,130

Приоритет:

11 мая 2018 г.

Данные о предшествующей публикации


	Идентификатор патента	Дата публикации
	US 20190348768 A1	Nov 14, 2019

Действующий класс US:	1/1
Действующий класс СПК:	H01Q15/14; H01Q3/36; H01Q15/248; H01Q21/0006; H01Q3/46; H01Q19/10; H01Q21/22
Действующий класс МПК:	H01Q21/22; H01Q21/00; H01Q3/36; H01Q15/14
Область поиска:	;342/368

ПРОЦИТИРОВАННЫЕ ССЫЛКИ [НА КОТОРЫЕ ССЫЛАЮТСЯ]

ПАТЕНТНЫЕ ДОКУМЕНТЫ США


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ИНОСТРАННЫЕ ПАТЕНТЫ


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Primary Examiner: Liu; Harry K
Attorney, Agent or Firm: Bell & Manning, LLC

ГОСУДАРСТВЕННЫЕ ИНТЕРЕСЫ

ССЫЛКА НА ПРАВА ГОСУДАРСТВА

This invention was made with government support under N00014-16-1-2308 awarded by the US Navy/ONR. The government has certain rights in the invention.

ФОРМУЛА ИЗОБРЕТЕНИЯ

What is claimed is:

1. A phase shifter comprising: a first dielectric layer including a top, first dielectric surface and a bottom, first dielectric surface, wherein the top, first dielectric surface is on an opposite side of the first dielectric layer relative to the bottom, first dielectric surface, wherein the first dielectric layer is formed of a dielectric material; a switch mounted to the bottom, first dielectric surface, the switch configured to be switchable between a first conducting position defined by a first throw arm and a second conducting position defined by a second throw arm; a conductive layer including a top conductive surface and a bottom conductive surface, wherein the top conductive surface is on an opposite side of the conductive layer relative to the bottom conductive surface, wherein the bottom conductive surface is mounted to the top, first dielectric surface, wherein the conductive layer is formed of a first conductive material; a second dielectric layer including a top, second dielectric surface and a bottom, second dielectric surface, wherein the top, second dielectric surface is on an opposite side of the second dielectric layer relative to the bottom, second dielectric surface, wherein the bottom, second dielectric surface is mounted to the top conductive surface, wherein the second dielectric layer is formed of a second dielectric material; a plurality of vias, wherein each via of the plurality of vias is formed of a second conductive material that extends through the first dielectric layer, through a third dielectric material formed in and through the conductive layer, and through the second dielectric layer, wherein each via of the plurality of vias is connected to the first throw arm or to the second throw arm of the switch; and a conducting pattern layer comprising a plurality of conductors, wherein the plurality of conductors is mounted to the top, second dielectric surface, wherein the conducting pattern layer is formed of a third conductive material, wherein each conductor of the plurality of conductors is mounted to a distinct via of the plurality of vias; wherein the first conductive material is configured to reflect an electromagnetic wave incident on the conducting pattern layer and on the second dielectric layer, wherein, when the incident electromagnetic wave is reflected, an electric polarization of the reflected electromagnetic wave is rotated by 90 degrees compared to an electric polarization of the incident electromagnetic wave when the switch is positioned in the first conducting position and the electric polarization of the reflected electromagnetic wave is rotated by -90 degrees compared to the electric polarization of the incident electromagnetic wave when the switch is positioned in the second conducting position.

2. The phase shifter of claim 1, wherein at least one of the first conductive material, the second conductive material, and the third conductive material is a different conductive material.

3. The phase shifter of claim 1, wherein at least one of the first dielectric material, the second dielectric material, and the third dielectric material is a different dielectric material.

4. The phase shifter of claim 1, wherein the first dielectric layer is formed of a plurality of layers of different dielectric materials.

5. The phase shifter of claim 1, wherein the second dielectric layer is formed of a plurality of layers of different dielectric materials.

6. The phase shifter of claim 1, wherein the plurality of conductors form a mirror image relative to a plane perpendicular to the top, second dielectric surface and through a center of the top, second dielectric surface.

7. The phase shifter of claim 1, wherein the dielectric material is air.

8. The phase shifter of claim 1, wherein each conductor of the plurality of conductors has a "T" shape.

9. The phase shifter of claim 1, wherein each conductor of the plurality of conductors has an open arrow shape.

10. The phase shifter of claim 9, wherein a tip of each open arrow shape is pointed in a direction that is 90 degrees from each adjacent tip.

11. The phase shifter of claim 1, wherein a number of the plurality of conductors is three.

12. The phase shifter of claim 1, wherein a number of the plurality of conductors is four.

13. The phase shifter of claim 1, wherein the first throw arm connects a first via of the plurality of vias to a second via of the plurality of vias, wherein a first conductor of the plurality of conductors is connected to the first via, wherein a second conductor of the plurality of conductors is connected to the second via.

14. The phase shifter of claim 13, wherein the second throw arm connects a third via of the plurality of vias to a fourth via of the plurality of vias, wherein a third conductor of the plurality of conductors is connected to the third via, wherein a fourth conductor of the plurality of conductors is connected to the fourth via.

15. The phase shifter of claim 14, wherein the plurality of conductors form a mirror image relative to a first plane perpendicular to the top, second dielectric surface and through a center of the top, second dielectric surface and relative to a second plane perpendicular to the top, second dielectric surface and through the center of the top, second dielectric surface.

16. The phase shifter of claim 13, wherein the second throw arm connects the first via of the plurality of vias to a third via of the plurality of vias, wherein a third conductor of the plurality of conductors is connected to the third via.

17. The phase shifter of claim 1, wherein the switch is a double pole, double throw switch.

18. The phase shifter of claim 1, wherein an electrical path length of each conductor of the plurality of conductors mounted to the distinct via of the plurality of vias is approximately a quarter of a wavelength .lamda..sub.0/4, where .lamda..sub.0=c/f.sub.0, where c is a speed of light and f.sub.0 is a carrier frequency of the incident electromagnetic wave.

19. The phase shifter of claim 1, wherein the switch is a single pole, double throw switch, and wherein an electrical path length of each conductor of the plurality of conductors mounted to the distinct via of the plurality of vias is approximately a half of a wavelength .lamda..sub.0/2, where .lamda..sub.0=c/f.sub.0, where c is a speed of light and f.sub.0 is a carrier frequency of the incident electromagnetic wave.

20. A phased array antenna comprising: a feed antenna configured to radiate an electromagnetic wave; and a plurality of phase shift elements distributed linearly in a direction, wherein each phase shift element of the plurality of phase shift elements comprises a first dielectric layer including a top, first dielectric surface and a bottom, first dielectric surface, wherein the top, first dielectric surface is on an opposite side of the first dielectric layer relative to the bottom, first dielectric surface, wherein the first dielectric layer is formed of a dielectric material; a switch mounted to the bottom, first dielectric surface, the switch configured to be switchable between a first conducting position defined by a first throw arm and a second conducting position defined by a second throw arm; a conductive layer including a top conductive surface and a bottom conductive surface, wherein the top conductive surface is on an opposite side of the conductive layer relative to the bottom conductive surface, wherein the bottom conductive surface is mounted to the top, first dielectric surface, wherein the conductive layer is formed of a first conductive material; a second dielectric layer including a top, second dielectric surface and a bottom, second dielectric surface, wherein the top, second dielectric surface is on an opposite side of the second dielectric layer relative to the bottom, second dielectric surface, wherein the bottom, second dielectric surface is mounted to the top conductive surface, wherein the second dielectric layer is formed of a second dielectric material; a plurality of vias, wherein each via of the plurality of vias is formed of a second conductive material that extends through the first dielectric layer, through a third dielectric material formed in and through the conductive layer, and through the second dielectric layer, wherein each via of the plurality of vias is connected to the first throw arm or to the second throw arm of the switch; and a conducting pattern layer comprising a plurality of conductors, wherein the plurality of conductors is mounted to the top, second dielectric surface, wherein the conducting pattern layer is formed of a third conductive material, wherein each conductor of the plurality of conductors is mounted to a distinct via of the plurality of vias; wherein the first conductive material is configured to reflect the radiated electromagnetic wave incident on the conducting pattern layer and on the second dielectric layer, wherein, when the incident electromagnetic wave is reflected, an electric polarization of the reflected electromagnetic wave is rotated by 90 degrees compared to an electric polarization of the incident electromagnetic wave when the switch is positioned in the first conducting position and the electric polarization of the reflected electromagnetic wave is rotated by -90 degrees compared to the electric polarization of the incident electromagnetic wave when the switch is positioned in the second conducting position.

ОПИСАНИЕ

ИСТОРИЯ ВОПРОСА

A phased array antenna is an array of antennas in which a relative phase of signals feeding each antenna is varied such that an effective radiation pattern of the array is reinforced in a desired direction and suppressed in undesired directions to provide electronic steering of a beam. To convert a reflector array into a beam steerable antenna, a phase shift distribution provided by spatial phase shifting pixels is dynamically changed depending on the direction of the desired output beam in the far field.

Beams are formed by shifting the phase of the signal emitted from each radiating element to provide either constructive or destructive interference to steer the beam. These antenna systems come in different sizes and scales due to several factors such as frequency and power requirements. High-power phased array antenna technology that yields an affordable system is a major problem in the commercial and military wireless industry. The cost of current phased array antenna technology is a major factor that limits application to the most expensive military systems. Additionally, the solid-state technology that lies at the heart of current phased array antenna technology has inherent limitations when it comes to power and heat handling capability due to the generation of a large amount of heat.

One of the desirable features that reflective array antennas offer is beam collimation using planar structures or structures that can conform to the outer surface of a given platform. A typical reflective array antenna consists of an array of terminated, unidirectional radiating elements operating as scatterers. When illuminated with a suitably-designed feed antenna, each element of the array scatters the wave with a different phase shift (or time delay) and amplitude. Collectively, the amplitude and phase (or time delay) responses of the elements are designed to provide beam collimation over the reflective array antenna's aperture. This way, a reflective array antenna can be thought of as an aperture populated with a number of discrete spatial phase shifters or spatial time delay units. Various techniques have been used to design reflective array antennas based on the design of the spatial phase shifters or time delay units that they use.

РЕЗЮМЕ

In an illustrative embodiment, a phase shifter is provided. The phase shifter includes, but is not limited to, a first dielectric layer, a switch, a conductive layer, a second dielectric layer, a plurality of vias, and a conducting pattern layer. The first dielectric layer includes, but is not limited to, a top, first dielectric surface and a bottom, first dielectric surface. The top, first dielectric surface is on an opposite side of the first dielectric layer relative to the bottom, first dielectric surface. The first dielectric layer is formed of a dielectric material. The switch is mounted to the bottom, first dielectric surface and configured to be switchable between a first conducting position defined by a first throw arm and a second conducting position defined by a second throw arm. The conductive layer includes, but is not limited to, a top conductive surface and a bottom conductive surface. The top conductive surface is on an opposite side of the first conductive layer relative to the bottom conductive surface. The bottom conductive surface is mounted to the top, first dielectric surface. The conductive layer is formed of a first conductive material. The second dielectric layer includes, but is not limited to, a top, second dielectric surface and a bottom, second dielectric surface. The top, second dielectric surface is on an opposite side of the second dielectric layer relative to the bottom, second dielectric surface. The bottom, second dielectric surface is mounted to the top conductive surface. The second dielectric layer is formed of a second dielectric material. Each via of the plurality of vias is formed of a second conductive material that extends through the first dielectric layer, through a third dielectric material formed in and through the conductive layer, and through the second dielectric layer. Each via of the plurality of vias is connected to the first throw arm or to the second throw arm of the switch. The conducting pattern layer includes, but is not limited to, a plurality of conductors. The plurality of conductors is mounted to the top, second dielectric surface. The conducting pattern layer is formed of a third conductive material. Each conductor of the plurality of conductors is mounted to a distinct via of the plurality of vias. The first conductive material is configured to reflect an electromagnetic wave incident on the conducting pattern layer and on the second dielectric layer. When the incident electromagnetic wave is reflected, an electric polarization of the reflected electromagnetic wave is rotated by 90 degrees compared to an electric polarization of the incident electromagnetic wave when the switch is positioned in the first conducting position and the electric polarization of the reflected electromagnetic wave is rotated by -90 degrees compared to the electric polarization of the incident electromagnetic wave when the switch is positioned in the second conducting position.

In another illustrative embodiment, a phased array antenna is provided. The phased array antenna includes, but is not limited to, a feed antenna and a plurality of phase shift elements distributed linearly in a direction. The feed antenna is configured to radiate an electromagnetic wave. Each spatial phase shift element of the plurality of spatial phase shift elements includes, but is not limited to, a first dielectric layer, a switch, a conductive layer, a second dielectric layer, a plurality of vias, and a conducting pattern layer. The first dielectric layer includes, but is not limited to, a top, first dielectric surface and a bottom, first dielectric surface. The top, first dielectric surface is on an opposite side of the first dielectric layer relative to the bottom, first dielectric surface. The first dielectric layer is formed of a dielectric material. The switch is mounted to the bottom, first dielectric surface and configured to be switchable between a first conducting position defined by a first throw arm and a second conducting position defined by a second throw arm. The conductive layer includes, but is not limited to, a top conductive surface and a bottom conductive surface. The top conductive surface is on an opposite side of the first conductive layer relative to the bottom conductive surface. The bottom conductive surface is mounted to the top, first dielectric surface. The conductive layer is formed of a first conductive material. The second dielectric layer includes, but is not limited to, a top, second dielectric surface and a bottom, second dielectric surface. The top, second dielectric surface is on an opposite side of the second dielectric layer relative to the bottom, second dielectric surface. The bottom, second dielectric surface is mounted to the top conductive surface. The second dielectric layer is formed of a second dielectric material. Each via of the plurality of vias is formed of a second conductive material that extends through the first dielectric layer, through a third dielectric material formed in and through the conductive layer, and through the second dielectric layer. Each via of the plurality of vias is connected to the first throw arm or to the second throw arm of the switch. The conducting pattern layer includes, but is not limited to, a plurality of conductors. The plurality of conductors is mounted to the top, second dielectric surface. The conducting pattern layer is formed of a third conductive material. The first conductive material is configured to reflect the radiated electromagnetic wave incident on the conducting pattern layer and on the second dielectric layer. When the incident electromagnetic wave is reflected, an electric polarization of the reflected electromagnetic wave is rotated by 90 degrees compared to an electric polarization of the incident electromagnetic wave when the switch is positioned in the first conducting position and the electric polarization of the reflected electromagnetic wave is rotated by -90 degrees compared to the electric polarization of the incident electromagnetic wave when the switch is positioned in the second conducting position.

Other principal features of the disclosed subject matter will become apparent to those skilled in the art upon review of the following drawings, the detailed description, and the appended claims.

КРАТКОЕ ОПИСАНИЕ РИСУНКОВ

Illustrative embodiments of the disclosed subject matter will hereafter be described referring to the accompanying drawings, wherein like numerals denote like elements.

FIG. 1 depicts a perspective side view of a phase shifting element in accordance with an illustrative embodiment.

FIG. 2 depicts a top view of the phase shifting element of FIG. 1 in accordance with an illustrative embodiment.

FIG. 3 depicts an exploded, perspective side view of the phase shifting element of FIG. 1 in accordance with an illustrative embodiment.

FIG. 4 depicts a bottom view of the phase shifting element of FIG. 1 in accordance with an illustrative embodiment.

FIG. 5A depicts a transparent perspective side view of the phase shifting element of FIG. 1 with dielectric material removed and with electric field and current flow directions shown based on a first switch position in accordance with an illustrative embodiment.

FIG. 5B depicts a second transparent perspective side view of the phase shifting element of FIG. 1 with the dielectric material removed and with the electric field and current flow directions shown based on a second switch position in accordance with an illustrative embodiment.

FIG. 6 depicts a transparent perspective side view of a second phase shifting element similar to that show in FIG. 1 with an additional dielectric material layer and shown with the second switch position in accordance with an illustrative embodiment.

FIG. 7 depicts a side view of a transceiver system that includes the phase shifting element of FIG. 1, the second phase shifting element of FIG. 6, a third phase shifting element of FIG. 24, or a fourth phase shifting element of FIG. 29 in accordance with illustrative embodiments.

FIG. 8 depicts a perspective view of the transceiver system of FIG. 7 in accordance with an illustrative embodiment.

FIG. 9 depicts a projection of a normalized magnitude of the fields generated by a feed antenna of the transceiver system of FIG. 7 on an aperture of a reflective array antenna in accordance with an illustrative embodiment.

FIG. 10 depicts a projection of an absolute value of a phase of the fields generated by the feed antenna of the transceiver system of FIG. 7 on the aperture of the reflective array antenna in the phase range from -180.degree. to 180.degree. in accordance with an illustrative embodiment.

FIG. 11 depicts a pattern of a distribution of the switch position of the phase shifting elements of FIG. 1, 6, 24, or 29 on the aperture of the reflective array antenna in accordance with an illustrative embodiment, where "bit 0" indicates the first switch position, and "bit 1" indicates the second switch position.

FIG. 12 depicts incident and reflective electric and magnetic field planes generated by the feed antenna and the reflective array antenna of the transceiver system of FIG. 7 in accordance with an illustrative embodiment.

FIG. 13 depicts an X-Y reflection coefficient and a Y-Y reflection coefficient as a function of frequency of the second phase shifting element of FIG. 6 in accordance with an illustrative embodiment.

FIG. 14 depicts a phase difference as a function of frequency between the second phase shifting element of FIG. 6 in the first switch position and in the second switch position in accordance with an illustrative embodiment.

FIG. 15 depicts a measured and a simulated co-polarization and cross-polarization gain as a function of angle generated by the reflective array antenna of the transceiver system of FIG. 7 with the second phase shifting element of FIG. 6 populating the reflective array with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 16 depicts a measured realized gain and directivity as a function of frequency generated by the feed antenna of the transceiver system of FIG. 7 in accordance with an illustrative embodiment.

FIG. 17 depicts a measured realized gain and directivity as a function of frequency generated by the reflective array antenna of the transceiver system of FIG. 7 with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 18 depicts a measured total efficiency as a function of frequency generated by the reflective array antenna of the transceiver system of FIG. 7 with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 19A depicts a measured co-polarization and cross-polarization gain of the reflective array antenna of the transceiver system of FIG. 7 in the E-plane at 8 Gigahertz (GHz) as a function of angle with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 19B depicts a measured co-polarization and cross-polarization gain of the reflective array antenna of the transceiver system of FIG. 7 in the H-plane at 8 GHz as a function of angle with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 20A depicts a measured co-polarization and cross-polarization gain of the reflective array antenna of the transceiver system of FIG. 7 in the E-plane at 9 GHz as a function of angle with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 20B depicts a measured co-polarization and cross-polarization gain of the reflective array antenna of the transceiver system of FIG. 7 in the H-plane at 9 GHz as a function of angle with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 21A depicts a measured co-polarization and cross-polarization gain of the reflective array antenna of the transceiver system of FIG. 7 in the E-plane at 10 GHz as a function of angle with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 21B depicts a measured co-polarization and cross-polarization gain of the reflective array antenna of the transceiver system of FIG. 7 in the H-plane at 10 GHz as a function of angle with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 22A depicts a measured co-polarization and cross-polarization gain of the reflective array antenna of the transceiver system of FIG. 7 in the E-plane at 11 GHz as a function of angle with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 22B depicts a measured co-polarization and cross-polarization gain of the reflective array antenna of the transceiver system of FIG. 7 in the H-plane at 11 GHz as a function of angle with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 23A depicts a measured co-polarization and cross-polarization gain of the reflective array antenna of the transceiver system of FIG. 7 in the E-plane at 12 GHz as a function of angle with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 23B depicts a measured co-polarization and cross-polarization gain of the reflective array antenna of the transceiver system of FIG. 7 in the H-plane at 12 GHz as a function of angle with the second phase shifting element of FIG. 6 populating the reflective array antenna with the switch positions as shown in FIG. 11 in accordance with an illustrative embodiment.

FIG. 24 depicts a perspective side view of the third phase shifting element in accordance with an illustrative embodiment.

FIG. 25 depicts a top view of the third phase shifting element of FIG. 24 in accordance with an illustrative embodiment.

FIG. 26 depicts an exploded, perspective side view of the third phase shifting element of FIG. 24 in accordance with an illustrative embodiment.

FIG. 27 depicts a bottom view of the third phase shifting element of FIG. 24 in accordance with an illustrative embodiment.

FIG. 28A depicts a transparent perspective side view of the third phase shifting element of FIG. 24 with dielectric material removed and with electric field and current flow directions shown based on a first switch position in accordance with an illustrative embodiment.

FIG. 28B depicts a second transparent perspective side view of the third phase shifting element of FIG. 24 with the dielectric material removed and with the electric field and current flow directions shown based on a second switch position in accordance with an illustrative embodiment.

FIG. 29 depicts a perspective side view of the fourth phase shifting element similar to that show in FIG. 24 with an additional dielectric material layer in accordance with an illustrative embodiment.

FIG. 30 depicts an X-Y reflection coefficient and a Y-Y reflection coefficient as a function of frequency of the fourth phase shifting element of FIG. 29 in accordance with an illustrative embodiment.

FIG. 31 depicts a phase difference as a function of frequency between the fourth phase shifting element of FIG. 29 in the first switch position and in the second switch position in accordance with an illustrative embodiment.

ПОДРОБНОЕ ОПИСАНИЕ

With reference to FIG. 1, a perspective side view of a phase shifting element 100 is shown in accordance with an illustrative embodiment. With reference to FIG. 2, a top view of phase shifting element 100 is shown in accordance with an illustrative embodiment. With reference to FIG. 3, an exploded, perspective side view of phase shifting element 100 is shown in accordance with an illustrative embodiment. With reference to FIG. 4, a bottom view of phase shifting element 100 is shown in accordance with an illustrative embodiment. With reference to FIG. 5A, a transparent perspective side view of phase shifting element 100 is shown with dielectric material removed and with electric field and current flow directions shown based on a first switch position in accordance with an illustrative embodiment. With reference to FIG. 5B, a second transparent perspective side view of phase shifting element 100 is shown with the dielectric material removed and with the electric field and current flow directions shown based on a second switch position in accordance with an illustrative embodiment. The separation between layers illustrated in FIGS. 3, 5A, and 5B are exaggerated to more clearly show the arrangement of the components of phase shifting element 100.

Phase shifting element 100 may include a first dielectric layer 102, a conducting layer 104, a second dielectric layer 106, and a conducting pattern layer 107. Phase shifting element 100 provides a polarization rotating surface that can be used as a spatial phase shifter of a single-layer, wideband reflective array antenna. Phase shifting element 100 rotates a polarization of a reflected wave by 90.degree. compared to that of an incident wave. Phase shifting element 100 can be switched between a first configuration and a second configuration that is a geometric mirror image of the first configuration. As such, phase shifting element 100 can be used as a one-bit spatial phase shifter that provides either -90.degree. or +90 polarization rotation compared to that of the incident wave. The two reflected fields have a phase difference of 180.degree. degrees between them. Therefore, if one is taken as a reference, the other one has a phase shift of 180.degree. with respect to the first one. Because phase shifting using phase shifting element 100 is achieved through geometric means, phase shifting element 100 can provide either 0.degree. or 180.degree. phase shift over extremely broad bandwidths.

First dielectric layer 102 is formed of one or more dielectric materials that may include foamed polyethylene, solid polyethylene, polyethylene foam, polytetrafluoroethylene, air, air space polyethylene, vacuum, etc. Illustrative dielectric materials include RO4003C laminate and RO3006 laminate sold by Rogers Corporation headquartered in Chandler, Ariz., USA.

Second dielectric layer 106 is also formed of one or more dielectric materials. First dielectric layer 102 and second dielectric layer 106 may be formed of the same or different dielectric materials and the same or a different number of layers of dielectric material.

Conducting layer 104 may be formed of a sheet of conductive material such as copper plated steel, silver plated steel, silver plated copper, silver plated copper clad steel, copper, copper clad aluminum, steel, etc. Conducting pattern layer 107 also may be formed of a conductive material such as copper plated steel, silver plated steel, silver plated copper, silver plated copper clad steel, copper, copper clad aluminum, steel, etc. Conducting layer 104 and conducting pattern layer 107 may be formed of the same or a different conductive material. Conducting layer 104 is a conducting surface with high conductivity that reflects received electromagnetic waves. Conducting layer 104 is connected to a fixed potential that may be, but is not necessarily, a ground potential. Conducting layer 104 may be generally flat or formed of ridges or bumps. For illustration, conducting layer 104 may be formed of a flexible membrane coated with a conductor.

Conducting layer 104 is mounted between first dielectric layer 102 and second dielectric layer 106 such that a top surface 310 of first dielectric layer 102 is mounted to a bottom surface of conducting layer 104, and second dielectric layer 106 is mounted to a top surface 312 of conducting layer 104. Each of first dielectric layer 102, conducting layer 104, and second dielectric layer 106 has a generally square top and bottom surface shape in an x-y plane and a thickness in a vertical direction denoted by a z-axis, where an x-axis is perpendicular to a y-axis, and both the x-axis and the y-axis are perpendicular to the z-axis to form a right-handed coordinate reference frame denoted x-y-z frame 122. First dielectric layer 102, conducting layer 104, and second dielectric layer 106 have a length 120 parallel to the x-axis, and a width 121 parallel to the y-axis. In the illustrative embodiment, length 120 is equal to width 121.

Second dielectric layer 106 has a back wall 108, a right-side wall 110, a front wall 112, a left-side wall 114, a top surface 115, and a bottom surface (not shown). The bottom surface of second dielectric layer 106 is mounted to top surface 312 of conducting layer 104.

The top and bottom surfaces of each of first dielectric layer 102, conducting layer 104, and second dielectric layer 106 are generally flat. First dielectric layer 102 has a first thickness 116 parallel to the z-axis. Conducting layer 104 has a second thickness 117 parallel to the z-axis. Second dielectric layer 106 has a third thickness 118 parallel to the z-axis.

Conducting pattern layer 107 is formed on top surface 115 of second dielectric layer 106 opposite conducting layer 104. Conducting pattern layer 107 includes a first corner conductor 124a, a second corner conductor 124b, a third corner conductor 124c, and a fourth corner conductor 124d. In the illustrative embodiment, first corner conductor 124a, second corner conductor 124b, third corner conductor 124c, and fourth corner conductor 124d each form an open arrow shape pointed at 135.degree., 45.degree., 315.degree., and 225.degree., respectively, in the x-y plane and relative to the +x-direction. Thus, a tip of each open arrow shape is pointed in a direction that is rotated 90.degree. relative to each adjacent tip.

First corner conductor 124a, second corner conductor 124b, third corner conductor 124c, and fourth corner conductor 124d are symmetrically distributed relative to each corner of top surface 115 of second dielectric layer 106. First corner conductor 124a and second corner conductor 124b form a mirror image of third corner conductor 124c and fourth corner conductor 124d relative to an x-z center plane through a center 134 of top surface 115 of second dielectric layer 106. The x-z center plane is parallel to the x-z plane defined by x-y-z frame 122. First corner conductor 124a and fourth corner conductor 124d form a mirror image of second corner conductor 124b and third corner conductor 124c relative to a y-z center plane through center 134 of top surface 115 of second dielectric layer 106. The y-z center plane is parallel to the y-z plane defined by x-y-z frame 122.

First corner conductor 124a is positioned in an upper left quadrant of top surface 115 of second dielectric layer 106. First corner conductor 124a includes a first switch connector 126a, a first connecting arm 128a, a first x-arm 130a, and a first y-arm 132a. First x-arm 130a and first y-arm 132a are perpendicular to each other, and first connecting arm 128a bisects the corner in which first x-arm 130a and first y-arm 132a join each other. As a result, first connecting arm 128a is aligned with and extends from the tip formed at the intersection of first x-arm 130a and first y-arm 132a. First switch connector 126a, first connecting arm 128a, first x-arm 130a, and first y-arm 132a are used to describe a shape of first corner conductor 124a and typically are not distinct elements but form a single conductive structure.

First switch connector 126a connects first corner conductor 124a to a first vertical interconnect access (via) 302a. First connecting arm 128a connects first x-arm 130a and first y-arm 132a to first switch connector 126a. First connecting arm 128a extends parallel to a diagonal between center 134 and an upper left corner 136. First x-arm 130a extends from upper left corner 136 towards an upper right corner 138 parallel to the x-axis. First y-arm 132a extends from upper left corner 136 towards a lower left corner 142 parallel to the y-axis.

First x-arm 130a is a first distance 200 from back wall 108. First y-arm 132a is first distance 200 from left-side wall 114. First x-arm 130a has a corner arm length 202 and a corner arm width 204. First y-arm 132a has corner arm length 202 and corner arm width 204. First connecting arm 128a has an arm length 208 and an arm width 206. For simplicity of description, first x-arm 130a, first y-arm 132a, and first connecting arm 128a have been described to overlap near an upper left corner 136 though again first switch connector 126a, first connecting arm 128a, first x-arm 130a, and first y-arm 132a typically are not distinct elements, but form a single conductive structure. Similarly, for simplicity of description, first switch connector 126a overlaps an end of first connecting arm 128a. First switch connector 126a is illustrated as having a square shape though it may have other shapes including circular, oval, triangular, etc.

First via 302a forms an electrical connection between a first throw arm 306 of a switch 304 through first dielectric layer 102, conducting layer 104, and second dielectric layer 106 to form an electronic circuit. First via 302a is formed of a conductive material. A first dielectric patch 300a is formed through conducting layer 104 of a dielectric material. First via 302a extends generally parallel to the z-axis through first dielectric patch 300a.

Second corner conductor 124b is positioned in an upper right quadrant of top surface 115 of second dielectric layer 106. Second corner conductor 124b includes a second switch connector 126b, a second connecting arm 128b, a second x-arm 130b, and a second y-arm 132b. Second x-arm 130b and second y-arm 132b are perpendicular to each other, and second connecting arm 128b bisects the corner in which second x-arm 130b and second y-arm 132b join each other. As a result, second connecting arm 128b is aligned with and extends from the tip formed at the intersection of second x-arm 130b and second y-arm 132b. Second switch connector 126b, second connecting arm 128b, second x-arm 130b, and second y-arm 132b are used to describe a shape of second corner conductor 124b and typically are not distinct elements but form a single conductive structure.

Second switch connector 126b connects second corner conductor 124b to a second via 302b. Second connecting arm 128b connects second x-arm 130b and second y-arm 132b to second switch connector 126b. Second connecting arm 128b extends parallel to a diagonal between center 134 and upper right corner 138. Second x-arm 130b extends from upper right corner 138 towards upper left corner 136 parallel to the x-axis. Second y-arm 132b extends from upper right corner 138 towards a lower right corner 140 parallel to the y-axis.

Second x-arm 130b is first distance 200 from back wall 108. Second y-arm 132b is first distance 200 from right-side wall 110. Second x-arm 130b has corner arm length 202 and corner arm width 204. Second y-arm 132b has corner arm length 202 and corner arm width 204. Second connecting arm 128b has arm length 208 and arm width 206. For simplicity of description, second x-arm 130b, second y-arm 132b, and second connecting arm 128b have been described to overlap near upper right corner 138 though again second switch connector 126b, second connecting arm 128b, second x-arm 130b, and second y-arm 132b typically are not distinct elements, but form a single conductive structure. Similarly, for simplicity of description, second switch connector 126b overlaps an end of second connecting arm 128b. Second switch connector 126b is illustrated as having a square shape though it may have other shapes including circular, oval, triangular, etc.

Second via 302b forms an electrical connection between a second throw arm 308 of switch 304 through first dielectric layer 102, conducting layer 104, and second dielectric layer 106 to form an electronic circuit. Second via 302b is formed of a conductive material. A second dielectric patch 300b is formed through conducting layer 104 of a dielectric material. Second via 302b extends generally parallel to the z-axis through second dielectric patch 300b.

Third corner conductor 124c is positioned in a lower right quadrant of top surface 115 of second dielectric layer 106. Third corner conductor 124c includes a third switch connector 126c, a third connecting arm 128c, a third x-arm 130c, and a third y-arm 132c. Third x-arm 130c and third y-arm 132c are perpendicular to each other, and third connecting arm 128c bisects the corner in which third x-arm 130c and third y-arm 132c join each other. As a result, third connecting arm 128c is aligned with and extends from the tip formed at the intersection of third x-arm 130c and third y-arm 132c. Third connecting arm 128c and first connecting arm 128a are parallel to each other. Third switch connector 126c, third connecting arm 128c, third x-arm 130c, and third y-arm 132c are used to describe a shape of third corner conductor 124c and typically are not distinct elements but form a single conductive structure.

Third switch connector 126c connects third corner conductor 124c to a third via 302c. Third connecting arm 128c connects third x-arm 130c and third y-arm 132c to third switch connector 126c. Third connecting arm 128c extends parallel to a diagonal between center 134 and lower right corner 140. Third x-arm 130c extends from lower right corner 140 towards lower left corner 142 parallel to the x-axis. Third y-arm 132c extends from lower right corner 140 towards upper right corner 138 parallel to the y-axis.

Third x-arm 130c is first distance 200 from front wall 112. Third y-arm 132c is first distance 200 from right-side wall 110. Third x-arm 130c has corner arm length 202 and corner arm width 204. Third y-arm 132c has corner arm length 202 and corner arm width 204. Third connecting arm 128c has arm length 208 and arm width 206. For simplicity of description, third x-arm 130c, third y-arm 132c, and third connecting arm 128c have been described to overlap near lower right corner 140 though again third switch connector 126c, third connecting arm 128c, third x-arm 130c, and third y-arm 132c typically are not distinct elements, but form a single conductive structure. Similarly, for simplicity of description, third switch connector 126c overlaps an end of third connecting arm 128c. Third switch connector 126c is illustrated as having a square shape though it may have other shapes including circular, oval, triangular, etc.

Third via 302c forms an electrical connection between first throw arm 306 of switch 304 through first dielectric layer 102, conducting layer 104, and second dielectric layer 106 to form an electronic circuit. Third via 302c is formed of a conductive material. A third dielectric patch 300c is formed through conducting layer 104 of a dielectric material. Third via 302c extends generally parallel to the z-axis through third dielectric patch 300c.

Fourth corner conductor 124d is positioned in a lower left quadrant of top surface 115 of second dielectric layer 106. Fourth corner conductor 124d includes a fourth switch connector 126d, a fourth connecting arm 128d, a fourth x-arm 130d, and a fourth y-arm 132d. Fourth x-arm 130d and fourth y-arm 132d are perpendicular to each other, and fourth connecting arm 128d bisects the corner in which fourth x-arm 130d and fourth y-arm 132d join each other. As a result, fourth connecting arm 128d is aligned with and extends from the tip formed at the intersection of fourth x-arm 130d and fourth y-arm 132d. Fourth connecting arm 128d and second connecting arm 128b are parallel to each other. Fourth switch connector 126d, fourth connecting arm 128d, fourth x-arm 130d, and fourth y-arm 132d are used to describe a shape of fourth corner conductor 124d and typically are not distinct elements but form a single conductive structure.

Fourth switch connector 126d connects fourth corner conductor 124d to a fourth via 302d. Fourth connecting arm 128d connects fourth x-arm 130d and fourth y-arm 132d to fourth switch connector 126d. Fourth connecting arm 128d extends parallel to a diagonal between center 134 and lower left corner 142. Fourth x-arm 130d extends from lower left corner 142 towards lower right corner 140 parallel to the x-axis. Fourth y-arm 132c extends from lower left corner 142 towards upper left corner 136 parallel to the y-axis.

Fourth x-arm 130d is first distance 200 from front wall 112. Fourth y-arm 132d is first distance 200 from left-side wall 114. Fourth x-arm 130d has corner arm length 202 and corner arm width 204. Fourth y-arm 132d has corner arm length 202 and corner arm width 204. Fourth connecting arm 128d has arm length 208 and arm width 206. For simplicity of description, fourth x-arm 130d, fourth y-arm 132d, and fourth connecting arm 128d have been described to overlap near lower left corner 142 though again fourth switch connector 126d, fourth connecting arm 128d, fourth x-arm 130d, and fourth y-arm 132d typically are not distinct elements, but form a single conductive structure. Similarly, for simplicity of description, fourth switch connector 126d overlaps an end of fourth connecting arm 128d. Fourth switch connector 126d is illustrated as having a square shape though it may have other shapes including circular, oval, triangular, etc.

Fourth via 302d forms an electrical connection between second throw arm 308 of switch 304 through first dielectric layer 102, conducting layer 104, and second dielectric layer 106 to form an electronic circuit. Fourth via 302d is formed of a conductive material. A fourth dielectric patch 300d is formed through conducting layer 104 of a dielectric material. Fourth via 302d extends generally parallel to the z-axis through fourth dielectric patch 300d.

Inclusion of first x-arms 130a, 130b, 130c, 130d perpendicular to first y-arms 132a, 132b, 132c, 132d, respectively, allows phase shifting element 100 to support polarizations parallel to the x-axis as well as the y-axis.

Switch 304 is a double pole, double throw (DPDT) switch. In a first position, first throw arm 306 of switch 304 is closed to electrically connect first via 302a and third via 302c. In a second position, second throw arm 308 of switch 304 is closed to electrically connect second via 302b and fourth via 302d. Switch 304 is mounted to bottom surface 400 of first dielectric layer 102. When switch 304 is in the first position, phase shifting element 100 may be designated as in a bit zero, "bit 0", configuration. When switch 304 is in the second position, phase shifting element 100 may be designated as in a bit one, "bit 1", configuration. Of course, the configurations can be reversed. Switch 304 may be a mechanical switch, a microelectromechanical system (MEMS) switch, a commercially available DPDT switch, a plurality of PIN diodes, etc.

A combined electrical path length of first connecting arm 128a and first via 302a is approximately .lamda..sub.0/4 (a quarter of the wavelength) and includes arm length 208 that defines a length of first connecting arm 128a and third thickness 118, third thickness 117, and third thickness 116 that define a length of first via 302a. Similarly, a combined electrical path length of second connecting arm 128b and second via 302b is approximately .lamda..sub.0/4. Similarly, a combined electrical path length of third connecting arm 128c and third via 302c is approximately .lamda..sub.0/4. Similarly, a combined electrical path length of fourth connecting arm 128d and fourth via 302d is approximately .lamda..sub.0/4. .lamda..sub.0 is the wavelength in free space at the frequency of operation.

An electrical path length of each of first throw arm 306 and of second throw arm 308 of switch 304 can be set in the range from .lamda..sub.0/100 to .lamda..sub.0/5 (e.g. based on a range of physical dimensions of several commercial electronic switches and PIN diodes). The electrical path length for the currents of switch 304 is included in a total electrical path length for each connected pair of arms (e.g., first connecting arm 128a and first via 302a connected to third connecting arm 128c and third via 302c) when connected by first throw arm 306 or second throw arm 308 of switch 304. The total electrical path length of each connected pair of arms is approximately half a wavelength.

With reference to FIG. 5A, the first position that defines the bit zero configuration is shown in accordance with an illustrative embodiment. In the first position, first throw arm 306 of switch 304 is closed to electrically connect first via 302a and third via 302c thereby electrically connecting first corner conductor 124a to third corner conductor 124c. First connecting arm 128a, first throw arm 306, and third connecting arm 128c are parallel to each other and form an angle of 135.degree. relative to the x-axis. When first connecting arm 128a and third connecting arm 128c are electrically connected via first throw arm 306 of switch 304, a total electrical length of an extended electrical pathway, which includes first x-arm 130a, first y-arm 132a, first connecting arm 128a, first switch connector 126a, first via 302a, first throw arm 306, third via 302c, third switch connector 126c, third connecting arm 128c, third x-arm 130c, and third y-arm 132c, is approximately half a wavelength. This results in very small currents flowing on first connecting arm 128a and third connecting arm 128c and large currents flowing on first throw arm 306 and first via 302a and third via 302c, thus deactivating the polarization rotating effect of this pair of arms.

On the other hand, second connecting arm 128b and fourth connecting arm 128d are electrically isolated, and the electrical length of each electrical pathway of second corner conductor 124b (second x-arm 130b, second y-arm 132b, second connecting arm 128b, second switch connector 126b, second via 302b) and of fourth corner conductor 124d (fourth x-arm 130d, fourth y-arm 132d, fourth connecting arm 128d, fourth switch connector 126d, fourth via 302d) is approximately a quarter wavelength, which results in large currents flowing on second connecting arm 128b and fourth connecting arm 128d as indicated in FIG. 5A. For an incident wave with an incident electric field E.sub.i 500 in the -x direction parallel to the x-axis, a periodic structure consisting of phase shifting elements 100 in the bit zero configuration rotates the polarization of the reflected wave by 90.degree. resulting in a reflected wave with a reflected electric field E.sub.r 508 in the -y direction parallel to the y-axis.

A first incident wave vector k.sub.i 502 points in a direction of incident wave propagation. A first reflected wave vector k.sub.r 510 points in a direction of reflected wave propagation. The magnitude of first incident wave vector k.sub.i 502 and of first reflected wave vector k.sub.r 510 are 2.pi./.lamda..sub.0.

With reference to FIG. 5B, the second position that defines the bit one configuration is shown in accordance with an illustrative embodiment. In the second position, second throw arm 308 of switch 304 is closed to electrically connect second via 302b and fourth via 302d thereby electrically connecting second corner conductor 124b to fourth corner conductor 124d. Second connecting arm 128b, second throw arm 308, and fourth connecting arm 128d are parallel to each other and form an angle of 45.degree. relative to the x-axis. When second connecting arm 128b and fourth connecting arm 128d are electrically connected via second throw arm 308 of switch 304, a total electrical length of an extended electrical pathway, which includes second x-arm 130b, second y-arm 132b, second connecting arm 128b, second switch connector 126b, second via 302b, second throw arm 308, fourth via 302d, fourth switch connector 126d, fourth connecting arm 128d, fourth x-arm 130d, and fourth y-arm 132d, is approximately half a wavelength. This results in very small currents flowing on second connecting arm 128b and fourth connecting arm 128d and large currents flowing on second throw arm 308 and second via 302b and fourth via 302d thus deactivating the polarization rotating effect of this pair of arms.

On the other hand, first connecting arm 128a and second connecting arm 128c are electrically isolated, and the electrical length of each electrical pathway of first corner conductor 124a (first x-arm 130a, first y-arm 132a, first connecting arm 128a, first switch connector 126a, first via 302a) and of third corner conductor 124c (third x-arm 130c, third y-arm 132c, third connecting arm 128c, third switch connector 126c, third via 302c) is approximately a quarter wavelength, which results in large currents flowing on first connecting arm 128a and second connecting arm 128c as indicated in FIG. 5B. For the incident wave with the incident electric field E.sub.i 500 in the -x direction parallel to the x-axis, a periodic structure consisting of phase shifting elements 100 in the bit one configuration rotates the polarization of the reflected wave by -90.degree. resulting in a reflected wave with a reflected electric field E.sub.r 516 in the +y direction parallel to the y-axis.

As a result, depending on whether phase shifting element 100 is in the bit zero configuration or in the bit one configuration based on the position of the throw arms of switch 304, phase shifting element 100 rotates the polarization of the reflected electric field by +90.degree. or by -90.degree. with respect to the polarization of the incident electric field. As a result, the two different modes supported by phase shifting element 100 provides reflected electric field E.sub.r 508 and reflected electric field E.sub.r 516 that are in opposite directions as shown in FIGS. 5A and 5B creating a phase difference of 180.degree. between the reflected waves in these modes.

Dimensions for phase shifting element 100 can be determined based on the following:

<.ltoreq..lamda..times..times..lamda..ltoreq..ltoreq..lamda.<.lamda- ..apprxeq..lamda. .times..times..lamda..ltoreq..ltoreq..lamda.< ##EQU00001## .lamda..ltoreq..times. .times. .ltoreq..lamda..times..times..ltoreq..times. <.lamda. ##EQU00001.2## <.ltoreq..lamda. ##EQU00001.3## <.ltoreq..lamda. ##EQU00001.4## <.ltoreq..lamda..times. ##EQU00001.5## where .lamda..sub.0=c/f.sub.0, where c is the speed of light and f.sub.0 is a carrier frequency, where P is length 120 and width 121, l.sub.1 is arm length 208, w.sub.1 is arm width 206, l.sub.2 is corner arm length 202, w.sub.2 is corner arm width 204, s is first distance 200, .sub.r,1 is a relative permittivity of a top layer of second dielectric layer 106, h.sub.1 is third thickness 118 of the top layer of second dielectric layer 106, .sub.r,n-1 is a relative permittivity of a next layer of second dielectric layer 106 when second dielectric layer 106 is formed of a plurality of dielectric layers n, h.sub.n-1 is a thickness of the next layer of second dielectric layer 106 when second dielectric layer 106 is formed of a plurality of dielectric layers n, .sub.r,m is a relative permittivity of first dielectric layer 102, h.sub.m is first thickness 116 of first dielectric layer 102. When second dielectric layer 106 is formed of the plurality of dielectric layers n, third thickness 118 is a total thickness of second dielectric layer 106. As an example, for f.sub.0.di-elect cons.[1,30] GHz, .lamda..sub.0.di-elect cons.[30,1] centimeters (cm).

Referring to FIG. 6, a transparent perspective side view of a second phase shifting element 600 is shown in accordance with an illustrative embodiment. Second phase shifting element 600 includes first dielectric layer 102, conducting layer 104, a third dielectric layer 106a, and conducting pattern layer 107. Third dielectric layer 106a is similar to second dielectric layer 106 except that it is formed of two dielectric layers, a top dielectric layer 602 and a sandwiched dielectric layer 604. Conducting pattern layer 107 is formed on top surface 115 of top dielectric layer 602 and has a fourth thickness 606. Sandwiched dielectric layer 604 is mounted between top dielectric layer 602 and conducting layer 104 and has a fifth thickness 608. In the illustrative embodiment of FIG. 6, sandwiched dielectric layer 604 is formed of air. Top dielectric layer 602 and first dielectric layer 102 are formed of RO4003C material with a dielectric constant of 3.4 and a loss tangent of 0.0027. Third thickness 118 is equal to fourth thickness 606 plus fifth thickness 608.

Generally, a thickness of conducting layer 104 and of conducting pattern layer 107 is at least several times that of a skin depth of the conductive material at the operating frequency to make sure the incident wave cannot penetrate through first dielectric layer 102 and a high reflection coefficient is achieved. For a good conductor such as copper, the skin depth is less than 2 micrometers (.mu.m) if the frequency is higher than 1 GHz. Therefore, the thickness of conducting layer 104 and of conducting pattern layer 107, for example, provided in printed circuit board fabrication technology (>17 .mu.m), is generally many times larger than the skin depth of copper. As long as this condition is satisfied, the value of the thickness of conducting layer 104 and of conducting pattern layer 107 does not have a significant role in the design of phase shifting element 100 or of second phase shifting element 600.

Second phase shifting element 600 was constructed in two embodiments to correspond with the first position and with the second position of switch 304. For simplicity of construction, each embodiment had a fixed position instead of using switch 304. For example, FIG. 6 shows a first embodiment of second phase shifting element 600 in the second position to form the bit one configuration and to electrically connect second via 302b and fourth via 302d. Though not shown, a second embodiment of second phase shifting element 600 in the first position to form the bit zero configuration and to electrically connect first via 302a and third via 302c was also constructed.

Illustrative dimensions for second phase shifting element 600 are P=6 millimeters (mm) for length 120 and width 121, l.sub.1=2.7 mm for arm length 208, w.sub.1=0.25 mm for arm width 206, l.sub.2=2.2 mm for corner arm length 202, w.sub.2=0.3 mm for corner arm width 204, s=0.15 mm for first distance 200, .epsilon..sub.r,1 is a relative permittivity of RO4003C material, h.sub.1=1 mm for fourth thickness 606, .epsilon..sub.r,2 is a relative permittivity of air, h.sub.2=3 mm for fifth thickness 608 such that third thickness 118 is 4 mm, .epsilon..sub.r,m is a relative permittivity of RO4003C material, and h.sub.m=1 mm for first thickness 116 of first dielectric layer 102. For illustration, second phase shifting element 600 can be fabricated using printed circuit board technology.

Referring to FIG. 7, a one-dimensional (1-D) side view of a transceiver system 700 is shown in accordance with an illustrative embodiment. Transceiver system 700 may include a feed antenna 702 and a plurality of phase shifting elements. Transceiver system 700 may act as a transmitter or a receiver of analog or digital signals. The plurality of phase shifting elements is arranged to form a reflective array antenna 704. Reflective array antenna 704 may be populated with any of phase shifting element 100, second phase shifting element 600, a third phase shifting element 2400 (shown referring to FIG. 24), or a fourth phase shifting element 2900 (shown referring to FIG. 29).

Feed antenna 702 may have a low-gain. Feed antenna 702 may be a dipole antenna, a monopole antenna, a helical antenna, a microstrip antenna, a patch antenna, a fractal antenna, a feed horn, a slot antenna, an end fire antenna, a parabolic antenna, etc. Feed antenna 702 is positioned a focal distance 712, f.sub.d, from a front face 705 of the plurality of phase shifting elements. Feed antenna 702 is configured to receive an analog or a digital signal, and in response, to radiate a spherical radio wave 706 toward front face 705 of the plurality of phase shifting elements. For example, front face 705 may include conducting pattern layer 107 of each phase shifting element. Feed antenna 702 also may be configured to receive spherical radio wave 706 from front face 705 of the plurality of phase shifting elements and to generate an analog or a digital signal in response.

The plurality of phase shifting elements may be arranged to form a one-dimensional (1D) or a two-dimensional (2D) array of spatial phase shift elements in any direction. The plurality of phase shifting elements may form variously shaped apertures including circular, rectangular, square, elliptical, etc. The plurality of phase shifting elements can include any number of phase shifting elements.

Referring to FIG. 8, a perspective view of transceiver system 700 is shown with a circular aperture. Feed antenna 702 is illustrated as a feed horn and is positioned at a center of reflective array antenna 704. The plurality of phase shifting elements are arranged to form a circular 2D array of phase shifting elements. The plurality of phase shifting elements has an aperture length 710, D.

Spherical radio wave 706 reaches different portions of front face 705 at different times. The plurality of phase shifting elements can be considered to be a plurality of pixels each of which act as a phase shift unit by providing a selected phase shift within the frequency band of interest. Thus, each phase shifting element of the plurality of phase shifting elements acts as a phase shift circuit selected such that spherical radio wave 706 is re-radiated in the form of a planar wave 708 that is parallel to front face 705, or vice versa. Given aperture length 710 and focal distance 712, the phase shift profile provided for the plurality of phase shifting elements to form planar wave 708 directed to a specific angle can be calculated as understood by a person of skill in the art. Center 134 of each phase shifting element is separated a distance 714 from center 134 of its neighbors in any direction. Distance 714 may be equal to length 120 and width 121.

For example, assuming feed antenna 702 is aligned to emit spherical radio wave 706 at the focal point of the plurality of phase shifting elements, the time it takes for each ray to arrive at front face 705 is determined by a length of each ray trace, i.e., the distance traveled by the electromagnetic wave traveling at the speed of light. A minimum time corresponds to a propagation time of the shortest ray trace, which is the line path from feed antenna 702 to a center of front face 705 for a center positioned feed antenna 702. A maximum time corresponds to a propagation time of the longest ray trace, which is the line path from feed antenna 702 to an edge of front face 705 for the center positioned feed antenna 702. Feed antenna 702 may be positioned at an off-center position with a resulting change in the distribution of ray traces to each phase shifting element. Of course, because the distance varies between feed antenna 702 and each phase shifting element of reflective array antenna 704, a magnitude of the portion of spherical radio wave 706 received by each phase shifting element also varies. For example, referring to FIG. 9, a normalized magnitude of the fields generated by feed antenna 702 projected on front face 705 of reflective array antenna 704 is shown for a square array composed of 50 phase shifting elements in both the x-axis direction and the y-axis direction. Aperture length 710 and width was approximately 30 cm using second phase shifting element 600. Focal distance 712 was also 30 cm. Referring to FIG. 10, a phase of the fields generated by feed antenna 702 projected on front face 705 of reflective array antenna 704 is shown. To achieve beam collimation and form planar wave 708, each phase shifting element of the plurality of phase shifting elements provides a reverse phase shift profile.

Referring to FIG. 11, a pattern of a distribution of the switch position of the phase shifting elements arranged on reflective array antenna 704 is shown in accordance with an illustrative embodiment, where "bit 0" indicates the first switch position that defines the bit zero configuration and "bit 1" indicates the second switch position that defines the bit one configuration. The pattern was determined such that the first switch position was used for each phase shifting element at a location having a phase angle of the incident electric field between -90.degree. and 90.degree., and the second switch position was used for each phase shifting element at a location having a phase angle of the incident electric field between 90.degree. and 180.degree. or between -180.degree. and -90.degree..

Referring to FIG. 12, an incident electric field plane 1200 and an incident magnetic field plane 1202 generated by feed antenna 702 and a reflected electric field plane 1204 and a reflected magnetic field plane 1206 generated by reflective array antenna 704 are shown in accordance with an illustrative embodiment. The relative change in angle between the incident and the reflective planes is 90.degree..

Referring to FIG. 13, an X-Y reflection coefficient curve 1300 and a Y-Y reflection coefficient curve 1302 show an X-Y reflection coefficient and a Y-Y reflection coefficient, respectively, as a function of frequency that result for second phase shifting element 600 designed using the illustrative dimensions above. Incident electric field plane 1200 was polarized parallel to the y-axis.

Referring to FIG. 14, a phase difference curve 1400 shows a phase difference as a function of frequency between the two embodiments of second phase shifting element 600 in the first switch position and in the second switch position in accordance with an illustrative embodiment. The phase difference is 180.degree. within the intended operating frequency range (7-13 GHz) of second phase shifting element 600. The blip in phase difference curve 1400 that occurs at .about.4.2 GHz is likely due to a transition between R.sub.yy-dominant reflection to R.sub.xy-dominant reflection around this frequency as shown in FIG. 13. This frequency is outside of the intended operating frequency range of second phase shifting element 600 (e.g. 7-13 GHz) so it is not a concern.

Referring to FIG. 15, a radiation pattern is shown in accordance with an illustrative embodiment for reflective array antenna 704. Second phase shifting element 600 populated each of the 50 by 50 array of pixel positions on reflective array antenna 704. A first gain curve 1500 shows measured co-polarization levels normalized to their maximum value as a function of angle. A second gain curve 1502 shows measured cross-polarization levels normalized to their maximum value as a function of angle. A third gain curve 1504 shows simulated co-polarization levels normalized to their maximum value as a function of angle. A fourth gain curve 1506 shows simulated cross-polarization as a function of angle. The simulated data was generated using full-wave electromagnetic simulation.

Referring to FIG. 16, a measured realized gain curve 1600 and a measured directivity curve 1602 show a gain and a directivity, respectively, as a function of frequency generated by feed antenna 704 in accordance with an illustrative embodiment.

Referring to FIG. 17, a measured realized gain curve 1700 and a measured directivity curve 1702 show a gain and a directivity, respectively, as a function of frequency generated by reflective array antenna 704 with second phase shifting element 600 populating each pixel position. A 3 decibel (dB) bandwidth existed between approximately 9 and 12.9 GHz.

Referring to FIG. 18, a measured total efficiency curve 1800 shows a total efficiency of reflective array antenna 704 with second phase shifting element 600 populating each pixel position as a function of frequency.

Referring to FIG. 19A, a measured co-polarization gain curve 1900 and a measured cross-polarization gain curve 1902 are shown as a function of angle in the E-plane at f.sub.0=8 GHz using reflective array antenna 704 with second phase shifting element 600 populating each pixel position. Referring to FIG. 19B, a measured co-polarization gain curve 1904 and a measured cross-polarization gain curve 1906 are shown as a function of angle in the H-plane at f.sub.0=8 GHz using reflective array antenna 704 with second phase shifting element 600 populating each pixel position.

Referring to FIG. 20A, a measured co-polarization gain curve 2000 and a measured cross-polarization gain curve 2002 are shown as a function of angle in the E-plane at f.sub.0=9 GHz using reflective array antenna 704 with second phase shifting element 600 populating each pixel position. Referring to FIG. 20B, a measured co-polarization gain curve 2004 and a measured cross-polarization gain curve 2006 are shown as a function of angle in the H-plane at f.sub.0=9 GHz using reflective array antenna 704 with second phase shifting element 600 populating each pixel position.

Referring to FIG. 21A, a measured co-polarization gain curve 2100 and a measured cross-polarization gain curve 2102 are shown as a function of angle in the E-plane at f.sub.0=10 GHz using reflective array antenna 704 with second phase shifting element 600 populating each pixel position. Referring to FIG. 21B, a measured co-polarization gain curve 2104 and a measured cross-polarization gain curve 2106 are shown as a function of angle in the H-plane at f.sub.0=10 GHz using reflective array antenna 704 with second phase shifting element 600 populating each pixel position.

Referring to FIG. 22A, a measured co-polarization gain curve 2200 and a measured cross-polarization gain curve 2202 are shown as a function of angle in the E-plane at f.sub.0=11 GHz using reflective array antenna 704 with second phase shifting element 600 populating each pixel position. Referring to FIG. 22B, a measured co-polarization gain curve 2204 and a measured cross-polarization gain curve 2206 are shown as a function of angle in the H-plane at f.sub.0=11 GHz using reflective array antenna 704 with second phase shifting element 600 populating each pixel position.

Referring to FIG. 23A, a measured co-polarization gain curve 2300 and a measured cross-polarization gain curve 2302 are shown as a function of angle in the E-plane at f.sub.0=12 GHz using reflective array antenna 704 with second phase shifting element 600 populating each pixel position. Referring to FIG. 23B, a measured co-polarization gain curve 2304 and a measured cross-polarization gain curve 2306 are shown as a function of angle in the H-plane at f.sub.0=12 GHz using reflective array antenna 704 with second phase shifting element 600 populating each pixel position.

The measured realized gains vary within 0.8 dB over the frequency range of 10-12 GHz with a maximum value of 23.5 dBi (dB relative to an isotropic radiator) at 11.2 GHz. Reflective array antenna 704 provides low side lobe levels and high polarization purity in this frequency range. Specifically, the measured side lobe levels are 15 dB, 13 dB, and 11.5 dB lower than the main lobe levels at 10 GHz, 11 GHz, and 12 GHz, respectively. The measured cross-polarization levels are 14 dB, 13 dB, and 11 dB below the co-polarization levels at 10, 11, and 12 GHz, respectively. The lowest side lobe level and highest polarization purity within this frequency range were achieved at 10 GHz, at which the pattern of the 1-bit phase shifters is optimized.

With reference to FIG. 24, a perspective side view of third phase shifting element 2400 is shown in accordance with an illustrative embodiment. With reference to FIG. 25, a top view of third phase shifting element 2400 is shown in accordance with an illustrative embodiment. With reference to FIG. 26, an exploded, perspective side view of third phase shifting element 2400 is shown in accordance with an illustrative embodiment. With reference to FIG. 27, a bottom view of third phase shifting element 2400 is shown in accordance with an illustrative embodiment. With reference to FIG. 28A, a transparent perspective side view of third phase shifting element 2400 is shown with dielectric material removed and with electric field and current flow directions shown based on a first switch position in accordance with an illustrative embodiment. With reference to FIG. 28B, a second transparent perspective side view of third phase shifting element 2400 is shown with the dielectric material removed and with the electric field and current flow directions shown based on a second switch position in accordance with an illustrative embodiment. The separation between layers illustrated in FIGS. 26, 28A, and 28B are exaggerated to more clearly show the arrangement of the components of third phase shifting element 2400.

Third phase shifting element 2400 may include a first dielectric layer 2402, a conducting layer 2404, a second dielectric layer 2406, and a conducting pattern layer 2407. Third phase shifting element 2400 provides a polarization rotating surface that can be used as a spatial phase shifter of a single-layer, wideband reflective array antenna. Third phase shifting element 2400 rotates a polarization of a reflected wave by 90.degree. compared to that of an incident wave. Third phase shifting element 2400 can be switched between a first configuration and a second configuration that is a geometric mirror image of the first configuration. The two configurations provide reflected fields having a phase difference of 180.degree. between them. Because phase shifting using third phase shifting element 2400 is achieved through geometric means, third phase shifting element 2400 can provide either 0.degree. or 180.degree. phase shift, acting as one-bit phase shifters, over extremely broad bandwidths.

First dielectric layer 2402 of third phase shifting element 2400 is similar to first dielectric layer 102 of phase shifting element 100. Second dielectric layer 2406 of third phase shifting element 2400 is similar to second dielectric layer 106 of phase shifting element 100. Conducting layer 2404 of third phase shifting element 2400 is similar to conducting layer 104 of phase shifting element 100.

Conducting layer 2404 is mounted between first dielectric layer 2402 and second dielectric layer 2406 such that a top surface 2610 of first dielectric layer 2402 is mounted to a bottom surface of conducting layer 2404, and second dielectric layer 2406 is mounted to a top surface 2612 of conducting layer 2404. Each of first dielectric layer 2402, conducting layer 2404, and second dielectric layer 2406 has a generally square top and bottom surface shape in an x-y plane and a thickness in a vertical direction denoted by a z-axis, where an x-axis is perpendicular to a y-axis, and both the x-axis and the y-axis are perpendicular to the z-axis to form a right-handed coordinate reference frame denoted x-y-z frame 2422. First dielectric layer 2402, conducting layer 2404, and second dielectric layer 2406 have a length 2420 parallel to the x-axis, and a width 2421 parallel to the y-axis. In the illustrative embodiment, length 2420 is equal to width 2421.

Second dielectric layer 2406 has a back wall 2408, a right-side wall 2410, a front wall 2412, a left-side wall 2414, a top surface 2415, and a bottom surface (not shown). The bottom surface of second dielectric layer 2406 is mounted to top surface 2612 of conducting layer 2404.

The top and bottom surfaces of each of first dielectric layer 2402, conducting layer 2404, and second dielectric layer 2406 are generally flat. First dielectric layer 2402 has a first thickness 2416 parallel to the z-axis. Conducting layer 2404 has a second thickness 2417 parallel to the z-axis. Second dielectric layer 106 has a third thickness 2418 parallel to the z-axis.

Conducting pattern layer 2407 is formed on top surface 2415 of second dielectric layer 2406 opposite conducting layer 2404. Conducting pattern layer 2407 includes a first T-shaped conductor 2424a, a second T-shaped conductor 2424b, and a third T-shaped conductor 2424c. First T-shaped conductor 2424a, second T-shaped conductor 2424b, and third T-shaped conductor 2424c form a mirror image relative to a y-z center plane through a center 2434 of top surface 2415 of second dielectric layer 2406. The y-z center plane is parallel to the y-z plane defined by x-y-z frame 2422.

First T-shaped conductor 2424a is positioned in an upper center of top surface 2415 of second dielectric layer 2406. First T-shaped conductor 2424a includes a first switch connector arm 2426a and a top T-arm 2428a. First switch connector arm 2426a and top T-arm 2428a are perpendicular to each other. First switch connector arm 2426a and top T-arm 2428a are used to describe a shape of first T-shaped conductor 2424a and typically are not distinct elements, but form a single conductive structure. First switch connector arm 2426a connects first T-shaped conductor 2424a to a first via 2602a. Top T-arm 2428a is centered between right-side wall 2410 and left-side wall 2414 and extends parallel to the x-axis. Top T-arm 2428a is a first distance 2500 from top wall 2408. First switch connector arm 2426a has an arm length 2502 and an arm width 2506. Top T-arm 2428a has an arm length 2508 and an arm width 2504.

First via 2602a forms an electrical connection between a first throw arm 2606 of switch 2604 through first dielectric layer 2402, conducting layer 2404, and second dielectric layer 2406 to form an electronic circuit. First via 2602a optionally may also form an electrical connection between second throw arm 2608 of switch 2604 through first dielectric layer 2402, conducting layer 2404, and second dielectric layer 2406 to form a second electronic circuit. First via 2602a is formed of a conductive material. A first dielectric patch 2600a is formed through conducting layer 2404 of a dielectric material. First via 2602a extends generally parallel to the z-axis through first dielectric patch 2600a.

Second T-shaped conductor 2424b is positioned in a right center of top surface 2415 of second dielectric layer 2406. Second T-shaped conductor 2424b includes a second switch connector arm 2426b and a right T-arm 2428b. Second switch connector arm 2426b and right T-arm 2428b are perpendicular to each other. Second switch connector arm 2426b and right T-arm 2428b are used to describe a shape of second T-shaped conductor 2424b and typically are not distinct elements, but form a single conductive structure. Second switch connector arm 2426b connects second T-shaped conductor 2424b to a second via 2602b. Right T-arm 2428b is centered between top wall 2408 and bottom wall 2412 and extends parallel to the y-axis. Right T-arm 2428b is a first distance 2510 from right-side wall 2410. Second switch connector arm 2426b has an arm length 2512 and an arm width 2516. Right T-arm 2428b has an arm length 2518 and an arm width 2514.

Second via 2602b forms an electrical connection between first throw arm 2606 of switch 2604 through first dielectric layer 2402, conducting layer 2404, and second dielectric layer 2406 to form an electronic circuit. Second via 2602b is formed of a conductive material. A second dielectric patch 2600b is formed through conducting layer 2404 of a dielectric material. Second via 2602b extends generally parallel to the z-axis through second dielectric patch 2600b.

Third T-shaped conductor 2424c is positioned in a left center of top surface 2415 of second dielectric layer 2406. Third T-shaped conductor 2424c includes a third switch connector arm 2426c and a left T-arm 2428c. Third switch connector arm 2426c and left T-arm 2428c are perpendicular to each other. Third switch connector arm 2426c and left T-arm 2428c are used to describe a shape of third T-shaped conductor 2424c and typically are not distinct elements, but form a single conductive structure. Third switch connector arm 2426c connects third T-shaped conductor 2424cb to a third via 2602c. Left T-arm 2428c is centered between top wall 2408 and bottom wall 2412 and extends parallel to the y-axis. Left T-arm 2428c is first distance 2510 from left-side wall 2414. Third switch connector arm 2426c has arm length 2512 and arm width 2516. Left T-arm 2428c has arm length 2518 and arm width 2514.

Third via 2602c forms an electrical connection between second throw arm 2608 of switch 2604 through first dielectric layer 2402, conducting layer 2404, and second dielectric layer 2406 to form an electronic circuit. Third via 2602c is formed of a conductive material. A third dielectric patch 2600c is formed through conducting layer 2404 of a dielectric material. Third via 2602c extends generally parallel to the z-axis through third dielectric patch 2600c.

Switch 2604 is a single pole, double throw (SPDT) switch. In a first position, first throw arm 2606 of switch 2604 is closed to electrically connect first via 2602a and second via 2602b. In a second position, second throw arm 2608 of switch 2604 is closed to electrically connect first via 2602a and third via 2602c. Switch 2604 is mounted to bottom surface 2700 of first dielectric layer 2402. When switch 2604 is in the first position, third phase shifting element 2400 may be designated as in a bit zero configuration. When switch 2604 is in the second position, third phase shifting element 2400 may be designated as in a bit one configuration. Switch 2604 may be a mechanical switch, a MEMS switch, a commercially available SPDT switch, a plurality of PIN diodes, etc.

In the first position, first throw arm 2606 of switch 2604 is closed to electrically connect first via 2602a and second via 2602b thereby electrically connecting first T-shaped conductor 2424a to second T-shaped conductor 2424b. Referring to FIG. 28A, for an incident wave with an incident electric field E.sub.i 2800 in the -x direction parallel to the x-axis, a periodic structure consisting of third phase shifting elements 2400 in the bit zero configuration rotates the polarization of the reflected wave by 90.degree. resulting in a reflected wave with a reflected electric field E.sub.r2808 in the +y direction parallel to the y-axis.

In the second position, second throw arm 2608 of switch 2604 is closed to electrically connect first via 2602a and third via 2602c thereby electrically connecting first T-shaped conductor 2424a to third T-shaped conductor 2424c. Referring to FIG. 28B, for the incident wave with incident electric field E.sub.i 2800 in the -x direction parallel to the x-axis, a periodic structure consisting of third phase shifting elements 2400 in the bit one configuration rotates the polarization of the reflected wave by -90.degree. resulting in a reflected wave with a reflected electric field E.sub.r 2816 in the -y direction parallel to the y-axis. As a result, depending on whether third phase shifting elements 2400 is in the bit zero configuration or in the bit one configuration based on the position of switch 2604, third phase shifting elements 2400 rotates the polarization of the reflected electric field by +90.degree. or by -90.degree. compared to that of the incident electric field.

Referring to FIG. 28A, when illuminated with the incident waves polarized along the -x direction, a first electric current 2804 and a second electric current 2805 are induced on second switch connector arm 2426b and on third switch connector arm 2426c. First T-shaped conductor 2424a, first via 2602a, first throw arm 2606 of switch 2604, second via 2602b, and second T-shaped conductor 2424b, form an extended electrical pathway that has an electrical length of approximately a wavelength. This results in a current minimum around the switch as well as the currents flowing in the same direction on first via 2602a and on second via 2602b. This dictates the direction of a third electric current 2806 on first switch connector arm 2426a. As a result, third phase shifting element 2400 produces a first effective current 2807a and a second effective current 2807b that make an angle of 225.degree. relative to the x-axis. Third phase shifting element 2400 acts as a perfect electric conductor for reflecting a first component of incident electric field E.sub.i 2800 parallel to the direction of first effective current 2807a and of second effective current 2807b, and as a perfect magnetic conductor for reflecting a second component of incident electric field E.sub.i 2800 orthogonal to the direction of first effective current 2807a and of second effective current 2807b. This leads to reflected electric field E.sub.r 2808 polarized in the +y direction parallel to the y-axis.

Referring to FIG. 28B, when illuminated with the incident waves polarized along the -x direction, a first electric current 2812 and a second electric current 2813 are induced on second switch connector arm 2426b and on third switch connector arm 2426c. First T-shaped conductor 2424a, first via 2602a, first throw arm 2606 of switch 2604, second via 2602b, and second T-shaped conductor 2424b, form an extended electrical pathway that has an electrical length of approximately a wavelength. This results in a current minimum around the switch as well as the currents flowing in the same direction on first via 2602a and on third via 2602c. This dictates the direction of a third electric current 2814 on first switch connector arm 2426a. As a result, third phase shifting element 2400 produces a first effective current 2815a and a second effective current 2815b that make an angle of 135.degree. relative to the x-axis. Third phase shifting element 2400 acts as a perfect electric conductor for reflecting the first component of incident electric field E.sub.i 2800 parallel to the direction of first effective current 2815a and of second effective current 2815b, and as a perfect magnetic conductor for reflecting the second component of incident electric field E.sub.i 2800 orthogonal to the direction of first effective current 2815a and of second effective current 2815b. This leads to reflected electric field E.sub.r 2816 polarized in the -y direction parallel to the y-axis.

Dimensions for third phase shifting element 2400 can be determined based on the following:

<.ltoreq..lamda. ##EQU00002## .lamda..ltoreq..ltoreq..lamda.<.lamda..apprxeq..lamda. ##EQU00002.2## .lamda..ltoreq..ltoreq..lamda. ##EQU00002.3## .lamda..ltoreq..ltoreq..lamda. ##EQU00002.4## .lamda..ltoreq..ltoreq..lamda. ##EQU00002.5## .lamda..ltoreq..times. .times. .ltoreq..lamda. ##EQU00002.6## .ltoreq..times. <.lamda..times..times.<.ltoreq..lamda.<.ltoreq..lamda..times..ti- mes.<.ltoreq..lamda.<.ltoreq..lamda..times..times.<.ltoreq..lamda- . ##EQU00002.7## where .lamda..sub.0 is a wavelength of operation and is defined as .lamda..sub.0=c/f.sub.0, where c is the speed of light and f.sub.0 is a carrier frequency, where P is length 2420 and width 2421, l.sub.1 is arm length 2502, w.sub.1 is arm width 2506, l.sub.2 is arm length 2508, w.sub.2 is arm width 2504, s is first distance 2500 and first distance 2510, l.sub.3 is arm length 2512, w.sub.3 is arm width 2516, l.sub.4 is arm length 2518, w.sub.4 is arm width 2514, .sub.r,1 is a relative permittivity of a top layer of second dielectric layer 2406, h.sub.1 is third thickness 2418 of the top layer of second dielectric layer 2406, .sub.r,n-1 is a relative permittivity of a next layer of second dielectric layer 2406 when second dielectric layer 2406 is formed of a plurality of dielectric layers n, h.sub.n-1 is a thickness of the next layer of second dielectric layer 2406 when second dielectric layer 2406 is formed of a plurality of dielectric layers n, .epsilon..sub.r,m is a relative permittivity of first dielectric layer 2402, h.sub.m is first thickness 2416 of first dielectric layer 2402. When second dielectric layer 2406 is formed of the plurality of dielectric layers n, third thickness 2418 is a total thickness of second dielectric layer 2406.

Referring to FIG. 29, a perspective side view of a fourth phase shifting element 2900 is shown in accordance with an illustrative embodiment. Fourth phase shifting element 2900 includes first dielectric layer 2402, conducting layer 2404, a fourth dielectric layer 2406a, and conducting pattern layer 2407. Fourth dielectric layer 2406a is similar to second dielectric layer 2406 except that it is formed of two dielectric layers, a top dielectric layer 2902 and a sandwiched dielectric layer 2904. Conducting pattern layer 2407 is formed on top surface 2415 of top dielectric layer 2902. Top dielectric layer 2902 has a fourth thickness 2906. Sandwiched dielectric layer 2904 is between top dielectric layer 2902 and conducting layer 2404 and has a fifth thickness 2908. In the illustrative embodiment of FIG. 29, sandwiched dielectric layer 2904 is formed of RO3006 material. Top dielectric layer 2902 and first dielectric layer 2902 are formed of RO4003C material with a dielectric constant of 3.4 and a loss tangent of 0.0027.

Fourth phase shifting element 2900 was constructed in two embodiments to correspond with either the first position or the second position of switch 2604. Illustrative dimensions for second phase shifting element 600 are P=8 mm for length 2420 and width 2421, l.sub.1, =3.6 mm for arm length 2502, w.sub.1=0.3 mm for arm width 2506, l.sub.2=2 mm for arm length 2508, w.sub.2=0.3 mm for arm width 2504, s=0.2 mm for first distance 2500 and first distance 2510, l.sub.3=1.9 mm for arm length 2512, w.sub.3=0.3 mm for arm width 2516, l.sub.4=2 mm for arm length 2518, w.sub.4=0.3 mm for arm width 2514, .epsilon..sub.r,1 is a relative permittivity of RO4003C material, h.sub.1=0.4 mm for fourth thickness 2906, .epsilon..sub.r,2 is a relative permittivity of RO3006 material, h.sub.2=2.6 mm for fifth thickness 2908 such that third thickness 2418 is 3 mm, .epsilon..sub.r,m is a relative permittivity of RO4003C material, and h.sub.m=0.4 mm for first thickness 2416 of first dielectric layer 2402.

Referring to FIG. 30, an X-Y reflection coefficient curve 3000 and a Y-Y reflection coefficient curve 3002 show an X-Y reflection coefficient and a Y-Y reflection coefficient, respectively, as a function of frequency that result when using fourth phase shifting element 2900 designed using the illustrative dimensions above. Incident electric field plane 1200 was polarized parallel to the y-axis.

Referring to FIG. 31, a phase difference curve 3100 shows a phase difference as a function of frequency between the two embodiments of fourth phase shifting element 2900 in the first switch position and in the second switch position in accordance with an illustrative embodiment. The phase difference is 180.degree. within the intended operating frequency range (e.g. 8.3-11.2 GHz) of fourth phase shifting element 2900. The blip in phase difference curve 3100 that occurred at .about.12.3 GHz is likely due to a transition between R.sub.yy-dominant reflection to R.sub.xy-dominant reflection around this frequency as shown in FIG. 30. This frequency is outside of the intended operating frequency range of second phase shifting element 600 (e.g. 8.3-11.2 GHz) so it is not a concern.

The combination of feed antenna 702 and the plurality of phase shifting elements form a high-gain antenna. A direction of maximum radiation of the high-gain antenna is determined by the phase shift gradient of the electric field distribution over the aperture of the plurality of phase shifting elements. Because the phase shift gradient is dynamically changeable by changing the position of switch 304 or of switch 2604 for each phase shifting element across the aperture, a direction of maximum radiation of the antenna also changes. Such a dynamically reconfigurable system constitutes a beam steerable phased array. Multiple steerable beams can be formed by multiple feed antennas.

The described phase shifting elements are easy to implement and make tunable (i.e., change the electric field rotation from -90.degree. to 90.degree. causing either a 0.degree. or 180.degree. relative phase shift between the reflected waves) using simple electrical switches. As a result, a phased-array implemented using the described phase shifting elements has significantly lower complexity and cost compared to alternative techniques. Moreover, the physics of beam steering and the nature of the described phase shifting elements allows for these phased arrays to handle relatively high levels of radiated power. The described phase shifting elements also provide a simple structure that achieves wideband operation. The described phase shifting elements do not use any nonlinear elements or any solid-state phase shifters or transmit/receive modules. As a result, apertures designed using the described phase shifting elements can handle significantly higher power levels in comparison with the existing technology. This feature is significant especially for millimeter-wave (MMW) communication systems. At MMW frequencies, the propagation losses are significantly higher compared to microwave frequencies. As a result, transmitters used at these frequencies must be able to radiate higher power levels to ensure that a communication link in the desired distance can be established.

The described phase shifting elements also do not require complex thermal management solutions to cool down the aperture of the antenna due to the fact that all the heat generating components are removed from the aperture. This significantly reduces the cost and complexity of thermal management of the array. This also reduces the weight of the phased-array.

As used herein, the term "mount" includes join, unite, connect, couple, associate, insert, hang, hold, affix, attach, fasten, bind, paste, secure, bolt, screw, rivet, solder, weld, glue, form over, form in, layer, mold, rest on, rest against, etch, abut, and other like terms. The phrases "mounted on", "mounted to", and equivalent phrases indicate any interior or exterior portion of the element referenced. These phrases also encompass direct mounting (in which the referenced elements are in direct contact) and indirect mounting (in which the referenced elements are not in direct contact, but are connected through an intermediate element). Elements referenced as mounted to each other herein may further be integrally formed together, for example, using a molding or a thermoforming process as understood by a person of skill in the art. As a result, elements described herein as being mounted to each other need not be discrete structural elements. The elements may be mounted permanently, removably, or releasably unless specified otherwise.

The word "illustrative" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "illustrative" is not necessarily to be construed as preferred or advantageous over other aspects or designs. Further, for the purposes of this disclosure and unless otherwise specified, "a" or "an" means "one or more". Still further, using "and" or "or" in the detailed description is intended to include "and/or" unless specifically indicated otherwise. The illustrative embodiments may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques to produce software, firmware, hardware, or any combination thereof to control a computer to implement the disclosed embodiments.

Any directional references used herein, such as left-side, right-side, top, bottom, back, front, up, down, above, below, etc., are for illustration only based on the orientation in the drawings selected to describe the illustrative embodiments.

The foregoing description of illustrative embodiments of the disclosed subject matter has been presented for purposes of illustration and of description. It is not intended to be exhaustive or to limit the disclosed subject matter to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the disclosed subject matter. The embodiments were chosen and described in order to explain the principles of the disclosed subject matter and as practical applications of the disclosed subject matter to enable one skilled in the art to utilize the disclosed subject matter in various embodiments and with various modifications as suited to the particular use contemplated.

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