Abstract
In this paper, we have designed the antenna for Korea SAT-5 Satellite Communication which can use Ka band in the earth station. The antenna structure consist of the the dual-offset gregorian reflector that has high gain and efficiency, the corrugatedhorn that has symmetric radiation patterns and low side lobe levels, the iris polarizer thatmake circular polarization and the OrthoMode Transducer that separate transmitting and receiving signals. The designed antenna gain is more than 45.7㏈i in Tx-band which use LHCP and 42.0㏈i in Rx-band which use RHCP. The co-polarized and cross-polarized radiation pattern comply with ITU-R S.580-6 and S.731-1 that are recommended by International Telecommunication Union in the geostationary satellite. The Axial ratio is less than 1.0㏈ in Tx-band and 1.5㏈ in Rx-band that meet MIL-STD-188-164A.
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