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US 11,424,555 B2Granted
Reflector antenna with minimal focal distance and low cross-polarization
AssigneeLockheed Martin Corporation
InventorsMark Winebrand, Jason Stewart Wrigley
Life of this patent
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Abstract
A reflector antenna includes a reflector, a feed, and a beamforming network. The feed is spaced apart at a focal distance from the reflector. The feed includes an array of dual linear polarized elements. The beamforming network is operatively coupled to the feed. The beamforming network is configured to generate a Sigma pattern and a Delta pattern in a plane orthogonal to the reflector plane of symmetry.
Claims19
A reflector antenna comprising:
- a reflector having a reflector plane of symmetry;
- a feed spaced apart at a focal distance from the reflector, the feed comprising an array of dual linear polarized elements;
- and
- a beamforming network operatively coupled to the feed and configured to generate a Sigma pattern and a Delta pattern in a plane orthogonal to the reflector plane of symmetry, wherein the Delta pattern is excited by power decoupled from the Sigma pattern.
1 more element
A feed for use with a reflector antenna, the feed comprising:
- an array of dual linear polarized orthomode transducers, wherein the array comprises an orthomode transducer that includes an asymmetric shape;
- and
- an open ended waveguide, wherein each dual linear polarized orthomode transducer is coupled to the open ended waveguide.
A reflector antenna comprising:
- a reflector;
- and
- an array of dual linear polarized orthomode transducers spaced apart from the reflector, wherein each dual linear polarized orthomode transducer is coupled to an open ended waveguide, and at least one orthomode transducer of the dual linear polarized orthomode transducers comprises an asymmetric shape.
Dependencies are inferred from the claim text.