Design of Orthogonally Polarized Feed Horn for Polarimetric Radar Reflector Antenna

An orthogonally polarized polarimetric radar feed horn was designed and developed. The radar feed showed 1.20 GHz bandwidth and very low port isolation at X-band frequency and acceptable radiation characteristics. A very complex elliptical aperture feed would be another design option meeting the edge illumination required for the elliptic aperture reflector. When this horn was employed as a feed source for the offset reflector, it showed acceptable radiation characteristics with the peak gain, peak cross-polarization and sidelobe levels of 36.90 dBi, -25 dB and -24 dB, respectively, for the both orthogonally polarized port excitations at 9.75 GHz. The prototype feed horn has been fabricated and was experimentally verified