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In this paper the design of a multimode corrugated feed at centre frequency of 7.25 GHz is presented, which reduces very high level of cross polarization in an offset parabolic reflector antenna system. The higher order modes TE21 and TM11 are generated in proper phase and magnitude in addition to the dominant, TE11 mode, which are passed through the corrugated structure to generate HE11 and HE21...