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Compact tri-band bandpass filter using asymmetric stub-loaded stepped-impedance resonator with multiple transmission zeros

Published online by Cambridge University Press:  10 February 2017

Hai-Wen Liu
Affiliation:
East China Jiaotong University, Shuanggang Road, Changbei District, Jiangxi 330013, China. Phone: +86 138 7066 6060
Fan Liu
Affiliation:
East China Jiaotong University, Shuanggang Road, Changbei District, Jiangxi 330013, China. Phone: +86 138 7066 6060
Bao-Ping Ren
Affiliation:
East China Jiaotong University, Shuanggang Road, Changbei District, Jiangxi 330013, China. Phone: +86 138 7066 6060
Ai-Ping Yao
Affiliation:
East China Jiaotong University, Shuanggang Road, Changbei District, Jiangxi 330013, China. Phone: +86 138 7066 6060
Xiang Xiao
Affiliation:
East China Jiaotong University, Shuanggang Road, Changbei District, Jiangxi 330013, China. Phone: +86 138 7066 6060
Yun-Xiu Yang
Affiliation:
East China Jiaotong University, Shuanggang Road, Changbei District, Jiangxi 330013, China. Phone: +86 138 7066 6060
Xue-Hui Guan
Affiliation:
East China Jiaotong University, Shuanggang Road, Changbei District, Jiangxi 330013, China. Phone: +86 138 7066 6060
Corresponding
E-mail address:

Abstract

In this paper, a tri-band bandpass filter (BPF) using asymmetric stub-loaded stepped-impedance resonator (SL-SIR) is presented. The asymmetric characteristic of SL-SIR broadens degrees of freedom for three controllable modes design. Also, the coupling coefficients (Mij) and the external quality factors (Qei) at each passband of the filter can be independently adjusted by the proposed mixed-type feedline structure. Besides, multi-transmission zeros are produced to improve the isolation and selectivity of the passbands. Finally, a tri-band BPF is operated at 1.9 GHz (time division long term evolution – TD-LTE band), 3.2 GHz (worldwide interoperability for microwave access – WiMAX band), and 5.8 GHz (wireless local area networks – WLAN band) and their insertion loss are 1.03, 0.94, and 1.27 dB, respectively. The measured results of the fabricated tri-band BPF exhibit good agreement with simulated results.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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References

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