Multi-band ring focus antenna system with co-located main reflectors

摘要

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-reflectors ( 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 ).