A broadband dual polarized antenna feed system

An antenna feed system operating at 3.4-4.8 and 5.85-7.075 GHz has been designed which conforms to the current polarization performance specifications required by the Intelsat. The principal design considerations and concepts are discussed, with particular attention given to the design of the corrugated horn, 4/6 GHz diplexer, and polarizers. The concept discussed is the simplest possible circuit which does not provide for either transmit or recieve polarization error correction. It is noted, however, that such requirements, if needed, can be realized by means of a rotatable 0 or 180 deg differential phase shifter in the transmit polarizer, and with a linear motion phase shifter in the receive polarizer added to the magic tee terminals. Results of engineering model tests are given.