Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering)

Abstract : In this paper, a high isolation, 5-pole reconfigurable and adjustable diplexer based on a pseudo-combline structure is designed and simulated. For each channel operating at particular bands S (2 GHz) and L (3.5 GHz), For each channel operating at particular bands S (2 GHz) and L (3.5 GHz), the proposed diplexer contains two BPFs. We suggest using a T-shaped feed section to make BPF of each channel work at the intended frequencies and to raise the matching level between them. The tunability attribute of the proposed diplexer, which allows the two bands of the diplexer to be tuned to different frequencies, is obtained by using of vector diodes. A pin diode may be utilized as a switch in the feed section between two BPFs for reconfigurability as well. With insertion losses of 0.86 and 0.39 dB and return losses of 12.24 and 18.47 dB, respectively, the suggested diplexer is small (46.12*40.49) mm. Finally, compared to previous comparable research, the suggested diplexer exhibits the maximum isolation between TX and RX ports (more than 60 dB).