Two-dimensionally electronically-steerable artificial impedance surface antenna
First Claim
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1. An apparatus comprising:
- a dielectric substrate;
a plurality of radiating spokes arranged radially with respect to a center point of the dielectric substrate, wherein each radiating spoke in the plurality of radiating spokes forms a surface wave channel configured to constrain a path of a surface wave, and wherein each of the plurality of radiating spokes comprises;
a plurality of tunable elements located on a surface of the dielectric substrate; and
a plurality of impedance elements located on the surface of the dielectric substrate and electrically connected to the plurality of impedance elements; and
a number of surface wave feeds, wherein each of the number of surface wave feeds couples at least one corresponding radiating spoke in the plurality of radiating spokes to a transmission line that carries a radio frequency signal.
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Abstract
A method and apparatus for electronically steering an antenna system. The apparatus comprises a dielectric substrate, a plurality of radiating spokes, and a number of surface wave feeds. The plurality of radiating spokes is arranged radially with respect to a center point of the dielectric substrate. Each radiating spoke in the plurality of radiating spokes forms a surface wave channel configured to constrain a path of a surface wave. Each of the number of surface wave feeds couples at least one corresponding radiating spoke in the plurality of radiating spokes to a transmission line that carries a radio frequency signal.
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Citations
19 Claims
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1. An apparatus comprising:
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a dielectric substrate; a plurality of radiating spokes arranged radially with respect to a center point of the dielectric substrate, wherein each radiating spoke in the plurality of radiating spokes forms a surface wave channel configured to constrain a path of a surface wave, and wherein each of the plurality of radiating spokes comprises; a plurality of tunable elements located on a surface of the dielectric substrate; and a plurality of impedance elements located on the surface of the dielectric substrate and electrically connected to the plurality of impedance elements; and a number of surface wave feeds, wherein each of the number of surface wave feeds couples at least one corresponding radiating spoke in the plurality of radiating spokes to a transmission line that carries a radio frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An antenna system comprising:
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a dielectric substrate; a plurality of radiating spokes arranged radially with respect to a center point of the dielectric substrate, wherein each of the plurality of radiating spokes forms a surface wave channel configured to constrain a path of a surface wave and wherein each of the plurality of radiating spokes comprises; a plurality of impedance elements located on a surface of the dielectric substrate; and a plurality of tunable elements located on the surface of the dielectric substrate and electrically connected to the plurality of impedance elements; a voltage controller that controls voltages applied to the plurality of tunable elements of each radiating spoke to control a theta steering angle of a main lobe of a radiation sub-pattern generated by each radiating spoke; and a number of surface wave feeds, wherein each of the number of surface wave feeds couples at least one corresponding radiating spoke in the plurality of radiating spokes to a transmission line that carries a radio frequency signal.
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14. A method for electronically steering a radiation pattern of an antenna, the method comprising:
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propagating surface waves along a plurality of surface wave channels formed by a plurality of radiating spokes to generate a number of radiation sub-patterns, wherein the plurality of radiating spokes is arranged radially with respect to a center point of a dielectric substrate and coupled to a number of surface wave feeds, and wherein each of the plurality of radiating spokes comprises; a plurality of tunable elements located on a surface of the dielectric substrate; and a plurality of impedance elements located on the surface of the dielectric substrate and electrically connected to the plurality of impedance elements; and steering, electronically, a main lobe of the radiation pattern of the antenna in two dimensions. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification