This paper presents a millimeter-wave, 60GHz frequency band planar diplexer based on substrate integrated waveguide (SIW)\r\ntechnology. Diplexer consists of a pair of 5th-order SIWbandpass channel filters with center frequencies at 59.8GHz and 62.2GHz\r\nproviding 1.67% and 1.6% relative bandwidths, respectively. SIW-to-microstrip transitions at diplexer ports enable integration in\r\na millimeter-wave transceiver front end. Measurements are in good agreement with electromagnetic simulation, reporting very\r\ngood channel isolation, small return losses, and moderate insertion losses in the passbands. The proposed SIW planar diplexer\r\nis integrated into a millimeter-wave transceiver front end for 60GHz point-to-point multigigabit wireless backhaul applications,\r\nproviding high isolation between transmit and receive channels.
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