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PIER PIER B PIER C PIER M PIER Letters
2010-09-14
A Dual-Wideband Bandpass Filter Based on E-Shaped Microstrip SIR with Improved Upper-Stopband Performance
By
Yan-Liang Wu,

    Dr. Yan-Liang Wu

    Southwest Jiaotong University

    China

    Homepage

Cheng Liao,

    Dr. Cheng Liao

    Southwest Jiaotong University

    China

    Homepage

Xiang-Zheng Xiong

    Dr. Xiang-Zheng Xiong

    Institute of Electromagnetics

    Southwest Jiaotong University

    China

    Homepage

Progress In Electromagnetics Research, Vol. 108, 141-153, 2010
doi:10.2528/PIER10071802
Abstract
A novel dual-wideband microstrip bandpass filter (BPF) with improved upper-stopband performance is presented. With the use of some special structures such as E-shaped microstrip Stepped-Impedance Resonator (SIR) and input-output cross-coupling feed structure, this filter can generate five transmission zeros which are beneficial for improving its frequency selectivity and upper-stopband performance. Finally the microstrip dual-wideband BPF has been simulated, fabricated and measured. Measurement results show that the two passbands are centered at 3.7 GHz and 5.8 GHz with the fractional bandwidth of 31% and 13% respectively. Meanwhile more than 50% relative upper stopband bandwidth with 20 dB rejection has been realized. The simulated and measured results are in good agreement.
Citation
Yan-Liang Wu, Cheng Liao, and Xiang-Zheng Xiong, "A Dual-Wideband Bandpass Filter Based on E-Shaped Microstrip SIR with Improved Upper-Stopband Performance," Progress In Electromagnetics Research, Vol. 108, 141-153, 2010.
doi:10.2528/PIER10071802
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