Patent ID: 6982679

Claim:
A multi-band antenna system comprising: a main reflector having a shaped surface of revolution about a boresight axis of said antenna system 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 sub-reflector defining a second shaped surface of revolution about said boresight axis of said antenna and a plurality of feed horns decoupled from said sub-reflector; a first one of said horns installed on said boresight axis at a first location separated by a first gap from a vertex of said sub-reflector, said first horn having a plurality of corrugations defining a profile extending from a throat of said first horn and along a tapered portion of said first horn, said profile shaped for producing a radiation pattern for illuminating said sub-reflector at a first frequency band; and a second one of said horns installed coaxial within said first one of said horns and separated from said vertex on said boresight axis by a second gap, said second horn configured for producing a radiation pattern illuminating said sub-reflector on a second frequency band spectrally offset from said first frequency band.