Frequency selective surface to suppress surface currents
First Claim
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1. An apparatus, comprising:
- a very high frequency (VHF) aircraft antenna; and
a frequency selective surface (FSS) structure adjacent to the VHF antenna, wherein the FSS structure includes;
a ground plane;
a first conductive via coupled to the ground plane;
a first conductive plate coupled to the first conductive via, wherein the FSS structure has a band gap frequency in the VHF band; and
a dielectric material between the first conductive plate and the ground plane, wherein the first conductive plate is formed overlying a first surface of the dielectric material and the ground plane is formed overlying a second surface of the dielectric material; and
a printed inductor overlying the first surface of the dielectric material and coupled to the conductive plate and the first conductive via.
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Abstract
Briefly, in accordance with an embodiment of the invention, an apparatus to suppress surface currents is provided. The apparatus may include very high frequency (VHF) antenna and a frequency selective surface (FSS) structure adjacent to the VHF antenna. The FSS structure may include a ground plane, a first conductive via coupled to the ground plane, and a first conductive plate coupled to the first conductive via, wherein the FSS structure has a band gap frequency in the VHF band.
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Citations
26 Claims
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1. An apparatus, comprising:
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a very high frequency (VHF) aircraft antenna; and a frequency selective surface (FSS) structure adjacent to the VHF antenna, wherein the FSS structure includes; a ground plane; a first conductive via coupled to the ground plane; a first conductive plate coupled to the first conductive via, wherein the FSS structure has a band gap frequency in the VHF band; and a dielectric material between the first conductive plate and the ground plane, wherein the first conductive plate is formed overlying a first surface of the dielectric material and the ground plane is formed overlying a second surface of the dielectric material; and a printed inductor overlying the first surface of the dielectric material and coupled to the conductive plate and the first conductive via. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus, comprising:
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a very high frequency (VHF) antenna aircraft and a frequency selective surface (FSS) structure adjacent to the VHF antenna, wherein the FSS structure includes; a ground plane; a first conductive via coupled to the ground plane; and a first conductive plate coupled to the first conductive via, wherein the FSS structure has a band gap frequency in the VHF band; a dielectric material between the first conductive pin and the ground plane, wherein the first conductive plate is formed overlying a first surface of the dielectric material and the ground plane is formed overlying a second surface of the dielectric material; and a first printed inductor overlying the first surface of the dielectric material and coupled to the first conductive plate and the first conductive via, wherein the first printed inductor and the first conductive via are formed substantially at the geometric center of first conductive plate. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus, comprising:
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a very high frequency (VHF) aircraft antenna; and a frequency selective surface (FSS) structure adjacent to the aircraft antenna and tuned to the operating frequency of the aircraft antenna, wherein the FSS structure includes; a conductive back plane; a conductive column coupled to the conductive back plane; a conductive pad coupled to the conductive column, wherein the thickness of the FSS structure and the surface area of the conductive pad are sized to suppress radio frequency (RF) surface currents in the VHF band from propagating along the conductive back plane; a dielectric material between the conductive and the conductive back plane, wherein the conductive is formed overlying a first surface of the dielectric material and the conductive back plane is formed overlying a second surface of the dielectric material; and a printed inductor overlying the first surface of the dielectric material and coupled to the conductive pad and the conductive column, wherein the printed inductor and the conductive column are formed substantially at the geometric center of conductive pad. - View Dependent Claims (17, 18)
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19. A system, comprising:
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an aircraft antenna coupled to receive radio frequency (RF) signals having a carrier frequency ranging from about 118 megahertz (MHz) to about 137 MHz; and a frequency selective surface (FSS) structure adjacent to the aircraft antenna that includes; a ground plane; a conductive via coupled to the ground plane; a conductive plate coupled to the conductive via; a dielectric material between the conductive pad and the conductive beck plane, wherein the conductive pad is formed overlying a first surface of the dielectric material and the conductive back plane is formed overlying a second surface of the dielectric material; and a printed inductor overlying the first surface of the dielectric material, wherein the FSS has a band gap frequency ranging from about 118 megahertz (MHz) to about 137 MHz. - View Dependent Claims (20, 21, 22)
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23. A system, comprising:
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an aircraft antenna coupled to receive radio frequency (RF) signals having a carrier frequency ranging from about 108 megahertz (MHz) to about 118 MHz; and a frequency selective surface (FSS) structure adjacent to the aircraft antenna that includes; a ground plane; a conductive via coupled to the ground plane; a conductive plate coupled to the conductive via; and a printed inductor coupled to the conductive plate, wherein the FSS has a band gap frequency ranging from about 108 megahertz (MHz) to about 118 MHz. - View Dependent Claims (24, 25, 26)
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Specification