paper 140313033019

A compact diplexer composed of quarter-wavelength resonators for ultra-wideband (UWB) system is proposed and implemented in this paper. The microstrip diplexer is mainly composed of two bandpass filters, which operates at 3.1–5.0 GHz (namely L-BPF) and 6.2– 10.1 GHz (namely H-BPF), respectively. Each filter is composed of three shorted-circuit quarter -wavelength resonators. After optimizing the performance, the highest return loss of each filter in the desired passband is −14 dB and −16.8 dB, respectively. For both filters, the insertion loss is below 1 dB and the wide stopband rejection is greater than 20 dB. The isolation between two channels is more than 25 dB. The design concept is proposed in detail and has been verified by the experimental results of a fabricated diplexer. The size is compact with overall dimensions of 19.5 × 19 × 0.8 mm3 .

Citation

Qing-Xin Chu, Zai-Cheng Guo, Jing-Yu Lin, Kai Wang, Sai Wai Wong, and Yu-Fa Zheng, "A Compact Diplexer Composed of Quarter-wavelength Resonators for Ultra-wideband (UWB) System," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1323-1326

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