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Electromagnetics Volume 33, 2013 - Issue 8
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Original Articles

Miniaturized Dual-Band Bandpass Filter with Multiple Transmission Zeros

X.-B. 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
,
G.-T. Yue Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
,
Y. Shi State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China
,
P. Wang Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
,
J.-X. Liao Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
&
Z.-Q. Xu Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
Pages 591-597 | Received 03 Jan 2013, Accepted 28 Apr 2013, Published online: 30 Oct 2013
 
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Abstract

A miniaturized dual-band bandpass filter with high frequency selectivity using stepped-impedance hairpin resonators is presented. The proposed filter consists of two sets of short-circuit centered stepped-impedance hairpin resonators, one of which is embedded in the other one to obtain two passbands. Multiple transmission zeros are employed via introducing mixed electric/magnetic coupling and source-load coupling simultaneously for high frequency selectivity. A 2.4-/5.2-GHz dual-band bandpass filter is designed and fabricated to demonstrate the proposed method. The measurement results show six finite transmission zeros in the stopband, located at 2.04, 3.67, 4.58, 5.89, 10.63, and 15.73 GHz, respectively. And the circuit only occupies 6.70 × 10.25 mm2.

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