Spatial filtering surface operative with antenna aperture for modifying aperture electric field
First Claim
Patent Images
1. A spatial filtering surface to be spaced adjacent an antenna aperture comprising:
- a dielectric substrate; and
a plurality of spaced, geometric configured, resonant elements positioned on the dielectric substrate, said resonant elements forming concentric rings and made of a material and of different geometric configuration for each ring and spaced from each other such that each ring attenuates any electromagnetic radiation passing therethrough a different amount, wherein a spatial filter transform is imparted and said resonant elements taper the magnitude of a produced aperture field.
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Abstract
A spatial filtering surface includes a dielectric substrate and a plurality of spaced, geometrically configured, resonant elements positioned on the dielectric substrate. The resonant elements form concentric rings that each attenuate any electromagnetic radiation passing therethrough a different amount wherein a spatial filter transform is imparted for tapering the magnitude and phase of a produced aperture field.
70 Citations
41 Claims
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1. A spatial filtering surface to be spaced adjacent an antenna aperture comprising:
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a dielectric substrate; and
a plurality of spaced, geometric configured, resonant elements positioned on the dielectric substrate, said resonant elements forming concentric rings and made of a material and of different geometric configuration for each ring and spaced from each other such that each ring attenuates any electromagnetic radiation passing therethrough a different amount, wherein a spatial filter transform is imparted and said resonant elements taper the magnitude of a produced aperture field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A spatial filtering surface to be spaced adjacent an antenna aperture comprising:
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a dielectric substrate forming a curved surface; and
a plurality of spaced, geometric configured, resonant elements positioned on the dielectric substrate, such resonant elements being formed of a material and of different geometric configuration for each ring and spaced from each other such that impinging electromagnetic radiation attenuates differently along the curve based on the impinging angle of incidence, wherein said resonant elements attenuate any electromagnetic radiation passing therethrough a different amount and taper the magnitude of a produced aperture field. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An antenna system comprising:
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an antenna dish;
a feed horn; and
a spatial filtering surface positioned adjacent the antenna dish and comprising a dielectric substrate forming a curved surface; and
a plurality of spaced, geometric configured, resonant elements positioned on the dielectric substrate, said resonant elements being formed of a material and of different geometric configuration for each ring and spaced from each other such that impinging electromagnetic radiation attenuates differently along the curve based on the impinging angle of incidence, wherein said resonant elements attenuate any electromagnetic radiation passing therethrough a different amount and taper the magnitude of a produced aperture field. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A spatial filtering surface to be spaced adjacent an antenna aperture comprising:
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a dielectric substrate; and
a plurality of spaced, geometric configured, resonant elements positioned on the dielectric substrate, said resonant elements forming concentric rings that each attenuate any electromagnetic radiation passing therethrough a different amount, said resonant elements having a different geometric configuration for each ring respectively, wherein a spatial filter transform is imparted for tapering the magnitude of a produced aperture field. - View Dependent Claims (39, 40, 41)
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Specification