A D-Band Manifold Triplexer with High Isolation Utilizing Novel Waveguide Dual-Mode Filters

Abstract

This letter presents our design of a wideband manifold-coupled triplexer with high isolation in D-band. The basic structure of channel filters is the novel TM120 and TE101 dual-mode cavity, which provide two reflection zeros and one transmission zero. To achieve good computational efficiency and design accuracy, the space-mapping technique, consists of a coarse distribute model and a fine full-wave electromagnetic model, is adopted in the development of the triplexer. The proposed triplexer is fabricated by high-precision computer numerical control milling technology. The measured results are all in good agreement with the simulated ones. The measured lowest in-band insertion loss is 0.54/0.62/0.55 dB for three channels, respectively. The return loss of each channel is better than 14 dB and the isolation between each channel is better than 45 dB.