Patent ID: 7868840

Claim:
A feed array for an antenna system, the feed array comprising: a plurality of high-efficiency multi-mode circular horns, wherein: each horn of the plurality of high-efficiency multi-mode circular horns of the feed array has a corresponding aperture diameter and a corresponding waveguide diameter; each horn has a corresponding first step, between the corresponding aperture diameter and the corresponding waveguide diameter, at which the corresponding waveguide diameter of a circular cross section of a corresponding horn abruptly changes; each horn has a corresponding second step, between the corresponding first step and the corresponding waveguide diameter, at which a second diameter of the circular cross-section of the corresponding horn abruptly changes; each horn of the feed array is focused for a primary reflector at a lowest frequency band; each horn of the feed array is defocused for the primary reflector at a middle frequency band; and each horn of the feed array is defocused for the primary reflector at a highest frequency band.