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Multi-band coaxial ring-focus antenna with co-located subreflectors

  • US 20050099351A1
  • Filed: 11/07/2003
  • Published: 05/12/2005
  • Est. Priority Date: 11/07/2003
  • Status: Active Grant
First Claim
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1. A method for multi-band operation of a ring focus antenna, comprising:

  • feeding a main reflector of said ring focus antenna on a first RF frequency band using a first feed horn spaced apart from a first sub-reflector along a boresight axis of said main reflector;

    feeding said main reflector on a second RF frequency band spectrally offset from said first band using a second feed horn spaced apart from a second sub-reflector along said boresight axis;

    co-locating a vertex of said first and second sub-reflector at a substantially equal distance from said main reflector to form with said first and second sub-reflectors a focal ring for each of said first and second bands at a common predetermined location spaced from said main reflector for concurrently illuminating said main reflector on said first and second bands; and

    positioning said first and second feed horns so that the phase center of each feed horn is located at a respectively different distance from said co-located vertexes.

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