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Journal of Electromagnetic Waves and Applications Volume 26, 2012 - Issue 13
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Articles

Miniaturized mixed-cross coupling bandpass filter with source–load coupling

X.-B. Wei Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, 611731, China; State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 611731, ChinaCorrespondence[email protected]
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Y. Shi State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 611731, China
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P. Wang Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, 611731, China
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J.-X. Liao Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, 611731, China
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Z.-Q. Xu Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu, 611731, China
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B.C. Yang State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 611731, China
Pages 1694-1699 | Received 31 May 2012, Accepted 25 Jun 2012, Published online: 19 Jul 2012
 
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Abstract

A miniaturized trisection bandpass filter (BPF) with improved stopband characteristics is presented. The proposed BPF consists of three stepped impedance resonators (SIRs), where the nonadjacent SIRs share a common shorted stub, and the other SIR is embedded inside the nonadjacent SIRs. To improve frequency selectivity, mixed-cross (M-C) coupling and source–load (S–L) coupling were introduced in the nonadjacent resonators and source/load ports, respectively. Owing to the M-C and S–L couplings, multiple transmission zeros (TZs) can be employed for high skirt selectivity and upper wide stopband. A new BPF centered at 2.45 GHz with 17.6% fractional bandwidth has been designed and fabricated to verify the validity of the proposed method. The measurement result shows four finite TZs in the stopband, located at 2.09, 2.98, 4.64, and 12.47 GHz, respectively. The circuit only occupies 6.70 × 8.60 mm2

Acknowledgments

This work was supported by the National Natural Science Foundation of China (51172034) and the Fundamental Research Funds for the Central University of UESTC (ZYGX2010J120).

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