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Electromagnetics Volume 32, 2012 - Issue 8
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Original Articles

Miniaturized Bandpass Filter with Improved Stopband

Xubo Wei Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, China; State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China
,
Yu Shi State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China
,
Jiaxuan Liao Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
,
Peng Wang Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
,
Ziqiang Xu Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
&
Bangchao Yang State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China
Pages 516-523 | Received 17 Mar 2012, Accepted 30 Jul 2012, Published online: 09 Nov 2012
 
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Abstract

In this article, a miniaturized bandpass filter with improved stopband using a short-circuit centered stepped impedance resonator is presented. An extra transmission zero can be provided near the passband for good frequency selectivity by introducing mixed electric/magnetic coupling in the proposed filter. Multiple transmission zeros are introduced in the upper stopband via, taking advantage of the harmonic effects of the distributed transmission line. Meanwhile, source-load coupling is introduced to improve the skirt selectivity via shifting the transmission zeros to the vicinity of the passband. The odd- and even-mode analytical method is used to design the filter. To verify the validity of the proposed technique, the new bandpass filter has been analyzed, simulated, and fabricated. The measurement results agree well with the full-wave electromagnetic designed responses.

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