Design of Bridge Diplexer Based on Dual-mode Generalized Filter

In this paper, a bridge duplexer is designed, which can integrate and output signals with similar frequencies. It consists of two band-pass filters, two 3dB power couplers and a part of transition structure. The whole system works in Ku frequency band and the two input ports respectively input narrowband signals and broadband signals. The overall simulation results show that the return loss of narrow-band and wide-band signal input ports is greater than 17dB and 20dB respectively, the insertion loss is less than 0.2dB and 0.3dB respectively, and the isolation between the two input ports is higher than 25dB, which indicates that the design can well meet the actual engineering requirements.