A Novel Cross Polarization Compensation Feed for Single Offset Reflector Antenna

This paper presented a multimode feed with novel chute corrugation for single offset parabolic reflector antennas, which is conjugate matched and uses novel chute corrugation. With three asymmetrical cylinders inserted, higher order mode TE21 is introduced into the horn in addition to the fundamental HE11 mode. Then adjusting TE21 mode with proper amplitude and phase and the cross polarization caused by the offset structure has been dramatically reduced in asymmetrical plane of secondary radiation pattern. The electric fields of TE21 mode at the aperture of the multimode horn and cross polarization of the reflector illuminated by the conventional horn are plotted to observe their similarity. Finally, the expected propagation performance and the cross polarization reduction are obtained, and the designed horn is easy to manufacturing and fabricate because of its simple and reliable structure.