Patent ID: 6937201

Claim:
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.