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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2017-03-16
Design of Triple-Bandpass Filters Using an Asymmetric Stepped-Impedance Ring Resonator
By
Wensong Wang,

    Dr. Wensong Wang

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

You Li,

    Dr. You Li

    Nanjing University of Aeronautics and Astronautics

    China

    Homepage

Qunsheng Cao,

    Prof. Qunsheng Cao

    College of Electronic and Information Engineering

    Nanjing University of Aeronautics & Astronautics

    China

    Homepage

Shuhui Yang,

    Prof. Shuhui Yang

    Department of Communication Engineering

    Communication University of China

    China

    Homepage

Yinchao Chen

    Dr. Yinchao Chen

    University of South Carolina

    USA

    Homepage

Progress In Electromagnetics Research Letters, Vol. 67, 7-12, 2017
doi:10.2528/PIERL17011605 | Google Scholar

Abstract
An asymmetric stepped-impedance ring resonator (ASIRR) is proposed for the design of a triple-bandpass filter. This resonator is applied to creat the former two passbands by utilizing a stepped-impedance circular ring and the third passband by introducing two asymmetric coupling structures. It is found that the S-parameter performance can be improved by adding a pair of shorted and open stubs, the second passband and the stopbands on both sides of the third passband can be tuned by adjusting the length of open stubs. A prototype filter operating at 1.04, 3.52 and 5.57 GHz is designed, fabricated, and measured with the corresponding fractional bandwidths of 23.1%, 7.4%, and 4.1%. Good agreements between the simulated and measured results are achieved for the ASIRR filter. Also, four transmission zeros are generated.
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Citation
Wensong Wang, You Li, Qunsheng Cao, Shuhui Yang, and Yinchao Chen, "Design of Triple-Bandpass Filters Using an Asymmetric Stepped-Impedance Ring Resonator," Progress In Electromagnetics Research Letters, Vol. 67, 7-12, 2017.
doi:10.2528/PIERL17011605
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