A High-Temperature Superconducting Triplexer Based on Co-Coupling of Multimode Resonators

This article presents a miniaturized C-band high-temperature superconducting triplexer. The triplexer is composed of multimode resonators and adopts the co-coupling structure to reduce its size. Furthermore, the co-coupling structure voids designing the impedance matching structure of triplexers adopting branch line structures and improves the design efficiency of triplexers. Besides, the isolation of the triplexer has been effectively improved by adjusting the coupling between resonators without increasing its size. The measured results show that the center frequencies of the triplexer are 5.503, 6.002, and 6.500 GHz, with relative bandwidths of 1.113%, 1.155%, and 1.115%, respectively. The insertion losses are 0.53, 0.28, and 0.37 dB, respectively. The isolations between channels are larger than 33.9 dB. The adopted approaches benefit to design miniaturized triplexers with high performance.