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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2022-11-14
A Simple Balanced Bandpass Filter Using Loop-Type Microstrip Resonator Loaded with Shorted/Opened Stubs
By
Jun-Mei Yan,

    Dr. Jun-Mei Yan

    School of Mechanical and Electronic Engineering

    Jingdezhen Ceramic University

    China

    Homepage

Zhi-Peng Xiao,

    Dr. Zhi-Peng Xiao

    School of Mechanical and Electronic Engineering

    Jingdezhen Ceramic Institute

    China

    Homepage

Liangzu Cao

    Professor Liangzu Cao

    School of Mechanical and Electronic Engineering

    Jingdezhen Ceramic University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 107, 141-149, 2022
doi:10.2528/PIERL22080204 | Google Scholar

Abstract
A simple balanced bandpass filter is presented. It is constructed mainly by a loop-type resonator with loaded shorted/opened stubs. The resonator is fed by the balanced coupled-line structure. In the loop-type resonator, three approaches can be simultaneously utilized to achieve high common-mode suppression. One is that the loop-type resonator has different differential/common-mode resonant frequencies, which results in a good in-band common-mode suppression. The second is that the loaded short stubs with different lengths will make the input/output port couplings to have different coupling strengths, which will deteriorate the common-mode bandpass response. The third is that loading the grounded resistors can effectively dissipate the common-mode signal. Meanwhile, loading the grounded resistors in the balanced coupled-line structure can effectively dissipate the reflective common-mode signal. A detailed description about its structure, operational mechanism and design method is given. For demonstration, a prototype balanced bandpass filter working at 2.4 GHz is designed, fabricated and measured. A high in-band common-mode suppression of 49 dB is achieved. The measured and simulated results can verify the effectiveness of the proposed balanced bandpass filter and the design method.
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Citation
Jun-Mei Yan, Zhi-Peng Xiao, and Liangzu Cao, "A Simple Balanced Bandpass Filter Using Loop-Type Microstrip Resonator Loaded with Shorted/Opened Stubs," Progress In Electromagnetics Research Letters, Vol. 107, 141-149, 2022.
doi:10.2528/PIERL22080204
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