Tunable-impedance spiral
First Claim
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1. A tuneable impedance structure comprising:
- (a) a plurality of electrically conductive elongate wires, each conductive elongate wire being defined by a plurality of spirals, the spirals of each conductive elongate wire having a pitch and being spaced apart along a major axis of said conductive elongate wire; and
(b) an arrangement for varying the pitch of the spirals of said plurality of conductive elongate wires to thereby tune the impedance of said tuneable impedance structure.
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Abstract
A method and apparatus for providing a high impedance structure or surface comprising at least one electrically conductive wire forming at least one elongate wire spiral, the at least one elongate wire spiral being defined by a plurality of spirals of said at least one wire, the spirals having a pitch and being spaced apart along a major axis of said elongate wire spiral; and an arrangement for varying the pitch of the spirals of said at least one wire to thereby tune the impedance of said tuneable impedance structure. An embodiment useful as an antenna aperture to steer a radio frequency beam having two different polarizations is disclosed.
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Citations
37 Claims
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1. A tuneable impedance structure comprising:
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(a) a plurality of electrically conductive elongate wires, each conductive elongate wire being defined by a plurality of spirals, the spirals of each conductive elongate wire having a pitch and being spaced apart along a major axis of said conductive elongate wire; and
(b) an arrangement for varying the pitch of the spirals of said plurality of conductive elongate wires to thereby tune the impedance of said tuneable impedance structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of tuning a high impedance surface comprising:
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arranging a plurality of elongated wire spirals in a generally planar and parallel relationship, each spiral having a pitch associated therewith; and
varying the pitch of each of the wire spirals to thereby tune the impedance of said high impedance surface. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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- 22. An antenna aperture for steering a radio frequency beam having two different polarizations, comprising two high impedance surfaces, the two high impedance surfaces each comprising an array of wire spirals arranged in a parallel relationship, the two high impedance surfaces being disposed proximate each other with the plurality parallel wire spirals of one high impedance structure being arranged orthogonally relative to the plurality of parallel elongate wire spirals of the other high impedance structure, the two high impedance surfaces having different impedance characteristics.
- 26. An antenna aperture for steering a radio frequency beam using a high impedance surface, the high impedance surface comprising a plurality of wire spirals arranged in a generally parallel relationship to one another, neighboring wire spirals in said plurality having different impedance characteristics.
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29. A tunable antenna aperture for steering a radio frequency beam having two different polarizations, the antenna aperture including two tuneable impedance structures, each tunable impedance structure comprising:
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(a) a plurality of electrically conductive spiral elements, each element including a plurality of spirals, the spirals of each element having a pitch and being spaced apart along a major axis of each said element, the spiral elements of each tunable structure being disposed essentially parallel to each other; and
(b) an arrangement for varying the pitch of the spirals of said plurality of elements of each tunable impedance structure to thereby tune the impedance of said tunable antenna aperture;
and wherein the two tuneable impedance structures are disposed proximate each other with the plurality of spiral elements one tuneable impedance structure being arranged orthogonally relative to the plurality of spiral elements of the other tuneable impedance structure. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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Specification