Patent ID: 6831613
Filing Date: 2004-12-14
Classification: H01Q

Abstract:
A compact multi-band antenna system comprising:a main reflector having a shaped surface of revolution about a boresight axis of said antenna and being operable at a plurality of frequency bands spectrally offset from each other; a multi band feed system for said main reflector comprising a shaped non-linear surface of revolution about said boresight axis of said antenna and a plurality of feed elements; a first one of said feed elements installed at a first feed element location separated by a first gap from a vertex of said shaped non-linear surface of revolution on said boresight axis of said antenna, said first feed element illuminating said shaped non-linear surface of revolution which defines a ring-shaped focal point about said boresight axis for illuminating said main reflector at a first one of said frequency bands; and a second one of said feed element installed at a second feed element location separated from said vertex on said boresight axis by a second gap, said second feed element coupled to said shaped non-linear surface of revolution at a second one of said frequency bands to form a single coupled feed, said single coupled feed defining a focal ring for illuminating said main reflector at said second one of said frequency bands.