Two-dimensionally electronically-steerable artificial impedance surface antenna
First Claim
1. An apparatus comprising:
- a plurality of radiating elements, wherein each radiating element in the plurality of radiating elements comprises a number of surface wave channels in which each of the number of surface wave channels is configured to constrain a path of a surface wave and each radiating element in the plurality of radiating elements comprises;
a plurality of switch elements, anda plurality of impedance elements; and
a plurality of surface wave feeds, wherein a surface wave feed in the plurality of surface wave feeds is configured to couple a surface wave channel in the number of surface wave channels of a radiating element in the plurality of radiating elements to a transmission line configured to carry a radio frequency signal; and
wherein the plurality of radiating elements and the plurality of surface wave feeds form an artificial impedance surface antenna that is configured to be electronically steered in a theta direction and a phi direction.
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Abstract
A method and apparatus for electronically steering an antenna system is provided. A surface wave is propagated along each of a number of surface wave channels formed in each of a plurality of radiating elements to form a radiation pattern. Each surface wave channel in the number of surface wave channels formed in each radiating element in the plurality of radiating elements is coupled to a transmission line configured to carry a radio frequency signal using a surface wave feed in a plurality of surface wave feed associated with the plurality of radiating elements. A main lobe of the radiation pattern is electronically steered by controlling voltages applied to a plurality of switch elements connecting a plurality of impedance elements in each of the number of surface wave channels.
31 Citations
20 Claims
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1. An apparatus comprising:
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a plurality of radiating elements, wherein each radiating element in the plurality of radiating elements comprises a number of surface wave channels in which each of the number of surface wave channels is configured to constrain a path of a surface wave and each radiating element in the plurality of radiating elements comprises; a plurality of switch elements, and a plurality of impedance elements; and a plurality of surface wave feeds, wherein a surface wave feed in the plurality of surface wave feeds is configured to couple a surface wave channel in the number of surface wave channels of a radiating element in the plurality of radiating elements to a transmission line configured to carry a radio frequency signal; and wherein the plurality of radiating elements and the plurality of surface wave feeds form an artificial impedance surface antenna that is configured to be electronically steered in a theta direction and a phi direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An artificial impedance surface antenna comprising:
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a plurality of radiating elements, wherein each of the plurality of radiating elements comprises a number of surface wave channels in which each of the number of surface wave channels is configured to constrain a path of a surface wave and wherein each of the plurality of radiating elements comprises; a plurality of impedance elements located on a surface of a dielectric substrate wherein an impedance element in the plurality of impedance elements has a pattern formed by a series of a same shape selected from one of a diamond-type shape and a hexagonal-type shape, and a plurality of switch elements located on the surface of the dielectric substrate in which each of the plurality of switch elements has a first state and a second state; and a plurality of surface wave feeds configured to couple the number of surface wave channels of each of the plurality of radiating elements to a number of transmission lines.
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17. A method for electronically steering an antenna system, the method comprising:
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propagating a surface wave along each of a number of surface wave channels formed in each of a plurality of radiating elements to form a radiation pattern; coupling each surface wave channel in the number of surface wave channels formed in each radiating element in the plurality of radiating elements to a transmission line configured to carry a radio frequency signal using a surface wave feed in a plurality of surface wave feeds associated with the plurality of radiating elements; and electronically steering a main lobe of the radiation pattern in a theta direction and a phi direction by controlling voltages applied to a plurality of switch elements connecting a plurality of impedance elements in each of the number of radiating elements. - View Dependent Claims (18, 19)
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20. An apparatus comprising:
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a plurality of radiating elements, wherein each radiating element in the plurality of radiating elements comprises a number of surface wave channels in which each of the number of surface wave channels is configured to constrain a path of a surface wave and each radiating element in the plurality of radiating elements comprises; a plurality of switch elements, and a plurality of impedance elements, wherein an impedance element in the plurality of impedance elements has a pattern formed by a series of a same shape selected from one of a diamond-type shape and a hexagonal-type shape; and a plurality of surface wave feeds, wherein a surface wave feed in the plurality of surface wave feeds is configured to couple a surface wave channel in the number of surface wave channels of a radiating element in the plurality of radiating elements to a transmission line configured to carry a radio frequency signal.
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Specification