Patent ID: 7511678

Claim:
A coaxial feedhorn antenna for a satellite communication system comprising: an outer conductive wall; an inner conductive wall coaxial with the outer conductive wall, the inner conductive wall and the outer conductive wall defining an outer coaxial horn portion for propagation of first signals therebetween, and the inner conductive wall defining an inner horn portion for propagation of second signals within the inner conductive wall, the outer coaxial horn portion and the inner horn portion each comprising an aperture at an end portion of the coaxial feedhorn antenna; and a conductive choke-ring coupled to the outer conductive wall, the conductive choke-ring being coaxial with the outer conductive wall and the inner conductive wall, the conductive choke-ring providing substantially equal E-plane and H-plane radiation patterns of the first signals and substantially reduced back-lobes.