Vol. 36

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2013-01-09

A High Selectivity Dual-Band Bandpass Filter Using Dual-Mode and Triple-Mode Resonators

By Xiao-Guo Huang, Quanyuan Feng, Qian-Yin Xiang, and Ding-Hong Jia
Progress In Electromagnetics Research C, Vol. 36, 81-90, 2013
doi:10.2528/PIERC12121701

Abstract

In this paper, a novel high selectivity dual-band microwave bandpass filter (BPF) using dual-mode and triple-mode resonator is proposed. First, a dual-band filter comprising two dual-mode single band filters using common input/out lines is designed. Each single BPF is realized using a stepped-impedance resonator (SIR) with a centrally-loaded shunt open stub. The first and second passband can be independently controlled by the two dual-mode resonators, respectively. The proposed filter also offers three transmission zeros (TZs) to improve the selectivity. To further improve the selectivity over high side band of the first passband, a novel triple-mode resonator is designed to replace the dual-mode resonator. The basic structure of triple-mode resonator is microstrip-to-coplanar waveguide (CPW) structure. The microstrip structure provides one odd mode and one even mode resonator frequency and the CPW structure can provide another even mode resonant frequency without increasing circuit size. Both simulated and measured results show that the filters exhibit a good performance, including a small insertion loss, selectivity.

Citation


Xiao-Guo Huang, Quanyuan Feng, Qian-Yin Xiang, and Ding-Hong Jia, "A High Selectivity Dual-Band Bandpass Filter Using Dual-Mode and Triple-Mode Resonators," Progress In Electromagnetics Research C, Vol. 36, 81-90, 2013.
doi:10.2528/PIERC12121701
http://jpier.org/PIERC/pier.php?paper=12121701

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