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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2016-02-12
A Novel Bandpass Filter with Controllable Transmission Zeros
By
Yun Wang,

    Dr. Yun Wang

    School of Electronic and Information Engineering

    South China University of Technology

    China

    Homepage

Fu-Chang Chen,

    Dr. Fu-Chang Chen

    School of Electronic and Information Engineering

    South China University of Technology

    China

    Homepage

Qing-Xin Chu

    Prof. Qing-Xin Chu

    School of Electronic and Information Engineering

    South China University of Technology

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 58, 141-147, 2016
doi:10.2528/PIERL15101301 | Google Scholar

Abstract
A planar bandpass filter is proposed in this paper. Its stopband is realized by using the concept of bandstop filter. A key merit of the filter configuration is that the position of the transmission zeros can be conveniently controlled whereas the bandwidth is fixed. The bandpass filter is realized using open circuited uniform impedance resonator and stepped impedance resonators. With five reflection zeros generated in the passband, ten controllable transmission zeros are introduced to sharpen the passband skirts. Skirt selectivity can be freely controlled by tuning the impedance ratio of the stepped impedance resonators. Without coupling gaps between resonators, the structure of the filter is simple and easy to fabricate. To illustrate the concept, a bandpass filter with ten transmission zeros is designed, fabricated and measured. Simulated and measured results are found to be in good agreement with each other, with insertion loss in the passbands less than 1 dB.
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Citation
Yun Wang, Fu-Chang Chen, and Qing-Xin Chu, "A Novel Bandpass Filter with Controllable Transmission Zeros," Progress In Electromagnetics Research Letters, Vol. 58, 141-147, 2016.
doi:10.2528/PIERL15101301
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