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Active and Passive Electronic Components
Volume 2013 (2013), Article ID 948217, 6 pages
Research Article

A 60 GHz Planar Diplexer Based on Substrate Integrated Waveguide Technology

Wireless Communications and e-Applications Research Group, Technological Educational Institute of Athens, Agion Spyridonos and Pallikaridi Street, 12210 Athens, Greece

Received 16 September 2012; Revised 31 December 2012; Accepted 8 January 2013

Academic Editor: Egidio Ragonese

Copyright © 2013 Nikolaos Athanasopoulos et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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