A C band diplexer incorporating the novel substrate integrated waveguide

Abstract

A C band planar microwave diplexer in the new emerging technology substrate integrated waveguide (SIW) is based on two-channel filters, a power divider, and three SIW microstrip transitions for input or output purposes. It is conceived under two designs, the first is such that the two-channel filters are perpendicular the second they are linear. Using 3D simulator HFSS, a C band SIW diplexer is investigated in this paper. Channel 1 has a centre frequency of 5.27 GHz, with a bandwidth from 5.20 to 5.33 GHz, and channel filter 2 has a centre frequency of 5.80 GHz, with a bandwidth from 5.76 to 5.84 GHz. The maximal insertion loss of channel 2 is −6.42 dB, while it is −4.62 dB for channel 1. The return loss is less than −10.5 dB for channel 2 and less than −11.8 dB for channel 1.

Keywords: Substrate integrated waveguide, C band, filter, diplexer, HFSS;