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Tri-band filter with multiple transmission zeros and controllable bandwidths

Published online by Cambridge University Press:  08 August 2014

Qun Li ,
Yong-Hong Zhang ,
Xin Feng  and
Yong Fan
Qun Li
Affiliation:
EHF Key Laboratory of Fundamental Science, School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Yong-Hong Zhang*
Affiliation:
EHF Key Laboratory of Fundamental Science, School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Xin Feng
Affiliation:
EHF Key Laboratory of Fundamental Science, School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Yong Fan
Affiliation:
EHF Key Laboratory of Fundamental Science, School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
*
Corresponding author: Y.-H. Zhang E-mail: zhangyhh@uestc.edu.cn
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Abstract

This paper presents a compact microstrip tri-band bandpass filter (BPF) using two multimode stepped-impedance resonators (SIRs) with a 0° feed structure. The fundamental odd-mode and even-mode resonant frequencies and the third resonant frequency are utilized to determine the center frequencies of the tri-band filter. The mode-splitting technique is used by combining two SIRs with electrical coupling. Therefore, two modes generate one passband and the bandwidths can be controlled by the electrical coupling strength. The 0° feed network is applied to create one pair of transmission zeros at each side of all the triple passbands, resulting in high selectivity. Finally, a tri-band BPF with the central frequencies of 1.8, 2.4, and 5.8 GHz, and respective fractional bandwidths of 8.9, 12.5, and 5.3% are designed and fabricated. The simulated and measured results show a good agreement.

Keywords

Bandpass filterTri-bandMode splittingStepped-impedance resonator (SIR)0°feed network
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 8 , Issue 1 , February 2016 , pp. 9 - 13
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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References

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