Antenna with Shaped Asymmetric Main Reflector and Subreflector with Asymmetric Waveguide Feed
First Claim
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1. A low-profile ring-focus reflector antenna system comprising:
- a main reflector formed as a shaped main reflector surface, and having a main reflector edge configuration that is asymmetric;
a feed system for said main reflector comprising a subreflector formed as a shaped subreflector surface, and having a subreflector edge configuration that is asymmetric;
a horn antenna extending in a direction aligned with a boresight axis, said horn antenna having an aperture that has an asymmetric shape when viewed along a boresight axis of said main reflector;
wherein at least one of said shaped main reflector surface and said shaped subreflector surface is defined by a plurality of different curves extending in a plurality of different radial directions in a 360 degree arc about said boresight axis.
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Abstract
A low-profile antenna system includes a main reflector (102) formed as a shaped main reflector surface that is approximately, but not precisely, parabolic. The main reflector (102) has a main reflector edge configuration (103) that is asymmetric. A feed system (104) for the main reflector includes a subreflector (106) formed as a shaped subreflector surface that is approximately, but not precisely, elliptical. The subreflector has a subreflector edge configuration (107) that is also asymmetric. An RF feed horn (108) associated with the feed system 104 has an aperture profile which also has an asymmetric shape.
184 Citations
23 Claims
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1. A low-profile ring-focus reflector antenna system comprising:
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a main reflector formed as a shaped main reflector surface, and having a main reflector edge configuration that is asymmetric; a feed system for said main reflector comprising a subreflector formed as a shaped subreflector surface, and having a subreflector edge configuration that is asymmetric; a horn antenna extending in a direction aligned with a boresight axis, said horn antenna having an aperture that has an asymmetric shape when viewed along a boresight axis of said main reflector; wherein at least one of said shaped main reflector surface and said shaped subreflector surface is defined by a plurality of different curves extending in a plurality of different radial directions in a 360 degree arc about said boresight axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A low-profile ring-focus reflector antenna system comprising:
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a main reflector formed as a shaped main reflector surface, and having a main reflector edge configuration that is asymmetric; a feed system for said main reflector comprising a subreflector formed as a shaped subreflector surface, and having a subreflector edge configuration that is asymmetric; a horn antenna extending in a direction aligned with a boresight axis, said horn antenna having an aperture that has an asymmetric shape when viewed along a boresight axis of said main reflector; wherein said shaped main reflector surface is defined by a plurality of different curves extending in a plurality of different radial directions in a 360 degree arc about said boresight axis, each of said plurality of different curves swept through a respective arc about said boresight axis. - View Dependent Claims (19, 20, 21, 22)
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23. A low-profile reflector antenna system comprising:
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a main reflector formed as a shaped main reflector surface; a feed system for said main reflector comprising a subreflector formed as a shaped subreflector surface; a horn antenna extending in a direction aligned with a boresight axis, said horn antenna having an aperture that has an asymmetric shape when viewed along a boresight axis of said main reflector; wherein at least one of said shaped main reflector surface and said shaped subreflector surface is defined by a plurality of different curves extending in a plurality of different radial directions in a 360 degree arc about said boresight axis, each of said plurality of different curves swept through a respective arc about said boresight axis.
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Specification