Tunable impedance surface
First Claim
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1. A tuneable impedance surface for reflecting a radio frequency beam, the tunable surface comprising:
- (a) a ground plane;
(b) a plurality of elements disposed in an array a distance from the ground plane, the distance being less than a wavelength of the radio frequency beam; and
(b) a capacitor arrangement for controllably varying capacitance between at least selected ones of adjacent elements in said array.
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Abstract
A tuneable impedance surface for steering and/or focusing a radio frequency beam. The tunable surface comprises a ground plane; a plurality of elements disposed a distance from the ground plane, the distance being less than a wavelength of the radio frequency beam; and a capacitor arrangement for controllably varying the capacitance of at least selected ones of adjacent elements. A method of tuning the high impedance surface allows the surface to mimic, for example, a parabolic reflector or a diffraction grating.
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Citations
34 Claims
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1. A tuneable impedance surface for reflecting a radio frequency beam, the tunable surface comprising:
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(a) a ground plane;
(b) a plurality of elements disposed in an array a distance from the ground plane, the distance being less than a wavelength of the radio frequency beam; and
(b) a capacitor arrangement for controllably varying capacitance between at least selected ones of adjacent elements in said array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of tuning a high impedance surface for reflecting a radio frequency signal comprising:
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arranging a plurality of generally spaced-apart conductive surfaces in an array disposed essentially parallel to and spaced from a conductive back plane, and varying the capacitance between at least selected ones of adjacent conductive surfaces in to thereby tune the impedance of said high impedance surface. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30)
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29. A tuneable impedance surface for reflecting a radio frequency beam, the tunable surface comprising:
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(a) a ground plane;
(b) a plurality of elements disposed in an array a distance from the ground plane, the distance being less than a wavelength of the radio frequency beam; and
(b) a capacitor arrangement for controllably varying the impedance along said array.
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31. A tunable impedance surface for reflecting a radio frequency beam impinging the surface, said tunable impedance surface comprising:
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(a) a ground plane;
(b) a plurality of discreet elements disposed in a two-dimensional array a distance from the ground plane, the distance being less than a wave length of the radio frequency beam; and
(c) a plurality of capacitors coupling neighboring ones of said elements in said two dimensional array for controllably varying capacitative coupling between said neighboring ones of said elements in said two-dimensional array. - View Dependent Claims (32, 33, 34)
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Specification