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The design and development of a tri-mode conjugate matched feed, to suppress the unwanted high cross-polarisation and beam squinting in an offset parabolic reflector antenna, are presented. In a smooth-walled cylindrical waveguide, TE11, TM11 and TE21 modes are combined in proper amplitude and phase to configure a tri-mode conjugate matched feed. The performance of the proposed tri-mode horn was evaluated,...
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