MULTI-BAND RING FOCUS ANTENNA SYSTEM WITH CO-LOCATED MAIN REFLECTORS
First Claim
1. A compact multi-band ring-focus antenna system comprising:
- a first and a second main reflector, each having a shaped surface of revolution about a common boresight axis of said antenna;
a first RF feed that is a backfire type system for feeding said first main reflector on a first frequency band;
a second RF feed coaxial with said first RF feed for feeding said second main reflector on a second frequency band spectrally offset from said first frequency band; and
wherein a portion of said second RF feed passes through a first sub-reflector of said backfire feed, and said second RF feed is terminated a distance from said first sub-reflector to illuminate a second sub-reflector.
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Accused Products
Abstract
A compact multi-band ring-focus antenna system. The antenna system includes a first and a second main reflector 304, 306, each having a shaped surface of revolution about a common boresight axis (322) of the antenna. A first backfire type RF feed system (302, 312) is provided for feeding the first main reflector (304) on a first frequency band. A second RF feed (301) coaxial with the first RF feed (300) is provided for feeding the second main reflector (306) on a second frequency band spectrally offset from the first frequency band. Further a portion of the second RF feed passes through a first sub-reflector (302) of the backfire feed. The second RF feed is terminated a distance from the first sub-reflector to illuminate a second sub-reflector (303).
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Citations
20 Claims
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1. A compact multi-band ring-focus antenna system comprising:
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a first and a second main reflector, each having a shaped surface of revolution about a common boresight axis of said antenna;
a first RF feed that is a backfire type system for feeding said first main reflector on a first frequency band;
a second RF feed coaxial with said first RF feed for feeding said second main reflector on a second frequency band spectrally offset from said first frequency band; and
wherein a portion of said second RF feed passes through a first sub-reflector of said backfire feed, and said second RF feed is terminated a distance from said first sub-reflector to illuminate a second sub-reflector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A compact multi-band ring-focus antenna system comprising:
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a first and a second main reflector, each having a shaped surface of revolution about a common boresight axis of said antenna, at least a portion of said first main reflector substantially co-located with said second main reflector and said first main reflector formed of a frequency selective surface (FSS);
a first RF feed that is a backfire type system for feeding said first main reflector on a first frequency band;
a second RF feed coaxial with said first RF feed for feeding said second main reflector on a second frequency band spectrally offset from said first frequency band; and
wherein a portion of said second RF feed passes through a first sub-reflector of said backfire feed, and said second RF feed is terminated a distance from said first sub-reflector to illuminate a second sub-reflector. - View Dependent Claims (14, 15, 16)
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17. A compact multi-band ring-focus antenna system comprising:
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a first and a second main reflector, each having a shaped surface of revolution about a common boresight axis of said antenna;
a first RF feed for feeding said first main reflector on a first frequency band, said first RF feed comprised of a first RF feed horn closely spaced from and coupled to a first sub-reflector to comprise a circular to radial waveguide transition;
a second RF feed coaxial with said first RF feed for feeding said second main reflector on a second frequency band spectrally offset from said first frequency band; and
wherein a portion of said second RF feed passes through said first sub-reflector, and said second RF feed is terminated a distance from said first sub-reflector to illuminate a second sub-reflector. - View Dependent Claims (18, 19, 20)
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Specification