Design and implementation of a narrow-band superconducting X-band diplexer with high isolation

Design and Performance of Microstrip Diplexers: A Review

“…Accordingly, the diplexer with f o2 /f o1 ≤1.1 has been less designed. As shown in Table II, only the proposed diplexer in Wang, et al, 2016, could reach f o2 /f o1 = 1.01, but it could not improve the common port return loss at both channels. The narrowband and wideband diplexers can be identified from the presented FBWs in Table II.…”

“…Therefore, to design a dual-channel diplexer, we need two single-mode resonators. Several structures have been proposed to design the dual-band bandpass diplexers (Feng, et al, 2017;Huang, et al, 2016;Yang, et al, 2014;Peng and Chiang, 2015;Jun-Mei, et al, 2016;Guan, et al, 2014;Xiao, et al, 2015;Sasipriya and Aparna, 2018;Rezaei, et al, 2017;Feng, et al, 2014;Chen, et al, 2006;Cheng, et al, 2013;Chinig, 2017;Wang, et al, 2016). To achieve a high performance, different mathematical methods have been used.…”

“…The comparison results show that the most compact dualband BBD is designed in , with the overall size of 0.01 λ g 2 . Another important factor in the diplexer design is the isolation between channels where the highest isolation (70 dB) is achieved in Wang, et al, 2016. When the channels are close together, the diplexer can be used for FDD applications. Nevertheless, having a small gap between channels leads to increase in the loss and decrease the isolation.…”

“…The diplexers can be formed by two bandpass filters (BPF), which are bandpass-bandpass diplexers (BBDs) (Jun-Mei, et al, 2016;Guan, et al, 2014;Xiao, et al, 2015;Sasipriya and Aparna, 2018;. Some of BBDs have two channels Rezaei, et al, 2017;Feng, et al, 2014;Chen, et al, 2006;Cheng, et al, 2013;Chinig, 2017;Wang, et al, 2016) named dual-channel diplexers. However, some have more than two channels.…”

Design of Ultra-Narrowband Miniaturized High Temperature Superconducting Bandpass Filter

“…In the past few years, plenty of efforts have been made for the design of narrowband bandpass filters, which are increasingly demanded for wireless personal communication services (PCS), global system for mobile communications (GSM) and satellite receiver links [1][2][3][4][5][6][7]. The ultra-narrowband (UNB) filters based on high temperature superconducting (HTS) films with very low microwave surface resistance and extremely high unloaded Q-factors can possess desirable low insertion loss, sharp selectivity, and high out-of-band rejection, which are greatly useful in the prevention of interference among wireless systems, especially in the systems with similar frequency bands.…”