Patent ID: 8730119

Claim:
A feed horn comprising: a mode conversion section having a first end and a second end, the mode conversion section to propagate first signals in a higher frequency band and second signals in a lower frequency band between the first end and the second end, and to at least partially convert the first signals in the higher frequency band between a first propagation mode at the first end and a second propagation mode at the second end; and an axial corrugation section to propagate the first signals in the higher frequency band and the second signals in the lower frequency band between the second end of the mode conversion section and an aperture of the feed horn; the axial corrugation section including protrusions in an axial direction of the feed horn to at least partially convert the second signals in the lower frequency band between the first propagation mode at the second end of the mode conversion section and a third propagation mode at the aperture.