Patent ID: 7002528

Claim:
A feed horn for use in at least one of transmitting and receiving circularly polarized signals in an antenna assembly that has a reflector with a non-circular profile, said feed horn comprising: a body having a longitudinal axis extending between a proximal end for communication with the reflector and a distal end for communication with one of a transmitter and receiver; a circular waveguide section located at said distal end of said body; a corrugated waveguide section located at said proximal end of said body; and a conical waveguide section having a conically shaped, non-corrugated inner wall connected between said circular and corrugated waveguide sections, wherein said corrugated waveguide section comprises: an inner wall that defines a circular cross-section at a distal end adjacent to said conical waveguide section, said inner wall incrementally widening to a non-circular cross-section at a proximal end of said corrugated waveguide section adjacent said proximal end of said body; and a plurality of grooves in said inner wall of said corrugated waveguide spaced along the longitudinal axis of said body, said grooves each having a depth defined in a thickness of said inner wall of said corrugation waveguide section, wherein said depth compensates circular polarized signals propagating through said body for distortions caused by the non-circular shape of the reflector.