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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2015-07-14
Compact Tri-Band Bandpass Filter Based on Hybrid Resonator with Improved Selectivity Performances
By
Shuai Yang,

    Dr. Shuai Yang

    School of Electronic Engineering

    Xidian University

    China

    Homepage

Jian Zhong Chen,

    Dr. Jian Zhong Chen

    Xidian University

    China

    Homepage

Bian Wu,

    Prof. Bian Wu

    School of Electronics Engineering

    Xidian University

    China

    Homepage

Chang-Hong Liang

    Professor Chang-Hong Liang

    School of Electronics Engineering

    Xidian University

    China

    Homepage

Progress In Electromagnetics Research C, Vol. 58, 117-123, 2015
doi:10.2528/PIERC15051802 | Google Scholar

Abstract
A novel microstrip tri-band bandpass filter is proposed and implemented using hybrid resonator with independently controllable center frequencies and good in-between isolation. This hybrid resonator is constructed by a stepped-impedance stub resonator and a single end shorted resonator. The stepped-impedance stub resonators are applied to achieve the first and second passband, while the third passband is implemented by single end shorted resonators. By applying the even-odd mode approach, the resonance frequency ratio between even mode and odd mode inside the stepped-impedance stub resonators is attained. Furthermore, the filter with multi-path coupling structure can generate the transmission zeros at the edge of the passband, which can effectively improve the filter passband selectivity. Finally, a tri-band filter operating at 1.91, 2.73, and 3.45 GHz is designed and fabricated. The measurement results accord well with the full-wave electromagnetic designed responses.
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Citation
Shuai Yang, Jian Zhong Chen, Bian Wu, and Chang-Hong Liang, "Compact Tri-Band Bandpass Filter Based on Hybrid Resonator with Improved Selectivity Performances," Progress In Electromagnetics Research C, Vol. 58, 117-123, 2015.
doi:10.2528/PIERC15051802
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