Millimeter-Wave Waveguide Diplexer

This paper presents a rectangular waveguide diplexer based on a T-junction can separate a common input signal into two distanced channels at millimeter-wave (mm-wave) spectrum. This diplexer is capable of separating of two channels operating at the frequencies 116 GHz and 183 GHz providing passbands of 4 GHz and 16 GHz for these two channels, respectively. In this work, a H-plane waveguide T-junction is used to achieve the desired results. The simulated results are in good agreement with the diplexer specifications. A return loss of more than 20 dB and an insertion loss of less than 1 dB have been obtained for both channels.