Surface scattering antenna improvements
First Claim
Patent Images
1. An antenna, comprising:
- a wave-propagating structure; and
a plurality of subwavelength patch elements distributed along the wave-propagating structure with inter-element spacings less than one-third of a free-space wavelength corresponding to an operating frequency of the antenna, where the plurality of subwavelength patch elements have a plurality of adjustable individual electromagnetic responses to a guided wave mode of the wave-propagating structure, and the plurality of adjustable individual electromagnetic responses provide an adjustable radiation field of the antenna;
wherein the wave-propagating structure includes a conducting surface, and the plurality of subwavelength patch elements corresponds to a plurality of conducting patches respectively positioned at least partially above a respective plurality of irises in the conducting surface; and
wherein the plurality of conducting patches is configured to provide a plurality of elliptically-polarized radiation fields responsive to iris-intermediated couplings between the conducting patches and the guided wave mode.
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Abstract
Surface scattering antennas provide adjustable radiation fields by adjustably coupling scattering elements along a wave-propagating structure. In some approaches, the scattering elements are patch elements. In some approaches, the scattering elements are made adjustable by disposing an electrically adjustable material, such as a liquid crystal, in proximity to the scattering elements. Methods and systems provide control and adjustment of surface scattering antennas for various applications.
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Citations
34 Claims
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1. An antenna, comprising:
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a wave-propagating structure; and a plurality of subwavelength patch elements distributed along the wave-propagating structure with inter-element spacings less than one-third of a free-space wavelength corresponding to an operating frequency of the antenna, where the plurality of subwavelength patch elements have a plurality of adjustable individual electromagnetic responses to a guided wave mode of the wave-propagating structure, and the plurality of adjustable individual electromagnetic responses provide an adjustable radiation field of the antenna; wherein the wave-propagating structure includes a conducting surface, and the plurality of subwavelength patch elements corresponds to a plurality of conducting patches respectively positioned at least partially above a respective plurality of irises in the conducting surface; and wherein the plurality of conducting patches is configured to provide a plurality of elliptically-polarized radiation fields responsive to iris-intermediated couplings between the conducting patches and the guided wave mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An antenna, comprising:
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a wave-propagating structure; a plurality of subwavelength patch elements distributed along the wave-propagating structure with inter-element spacings less than one-third of a free-space wavelength corresponding to an operating frequency of the antenna, where the plurality of subwavelength patch elements have a plurality of adjustable individual electromagnetic responses to a guided wave mode of the wave-propagating structure, the plurality of adjustable individual electromagnetic responses provide an adjustable radiation field of the antenna, the wave-propagating structure includes a conducting surface, and the plurality of subwavelength patch elements corresponds to a plurality of conducting patches respectively positioned at least partially above a respective plurality of irises in the conducting surface; a plurality of bias voltage lines configured to provide respective bias voltages between the plurality of conducting patches and the conducting surface; and an electrically adjustable material disposed between the plurality of conducting patches and the plurality of irises in the conducting surface. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification