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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2020-09-24
Application of Stub-Loaded Step-Impedance Resonator for Quint-Band Bandpass Filter Design
By
Liqin Liu,

    Dr. Liqin Liu

    Putian University

    China

    Homepage

Min-Hang Weng,

    Dr. Min-Hang Weng

    Medical devices and opto-electronics equipment department

    Metal Industries Research & Development Center

    Taiwan

    Homepage

Yabin Weng,

    Dr. Yabin Weng

    Putian University

    China

    Homepage

Chin-Yi Tsai,

    Dr. Chin-Yi Tsai

    Graduate Institute of Materials Engineering

    National Pingtung University of Science and Technology

    Taiwan

    Homepage

Ru-Yuan Yang

    Professor Ru-Yuan Yang

    Department of Material Engineering

    National Ping-Tung University of Science and Technology

    Taiwan

    Homepage

Progress In Electromagnetics Research M, Vol. 96, 169-179, 2020
doi:10.2528/PIERM20062903 | Google Scholar

Abstract
Stub-loaded step-impedance resonator (SLSIR) is a multi-mode resonator and can be applied to implement multi-band or wideband filters. In this paper, odd- and even mode impedance analysis is used to resonant properties of the SLSIR. Only two SLSIRs are applied to design a quint-band bandpass filter (BPF). To find the required five resonant modes, the frequency ratios of the high order modes to the fundamental mode of the SLSIR are calculated depending on the impedance ratio and the length ratio of the SLSIR. Several coupling types of the SLSIRs are considered first to have enough energy for all the five passbands. When forming the quint-band, a pair of the SLSIR are coupled electrically and connected with 0o feeding input/output structure. The center frequencies are designed at 1.38 GHz, 2.58 GHz, 3.69 GHz, 5.36 GHz, and 5.8 GHz, corresponding to the different communication applications. The filter is designed, fabricated, and measured. Simulated and experimental results are in agreement, verifying the design concept.
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Citation
Liqin Liu, Min-Hang Weng, Yabin Weng, Chin-Yi Tsai, and Ru-Yuan Yang, "Application of Stub-Loaded Step-Impedance Resonator for Quint-Band Bandpass Filter Design," Progress In Electromagnetics Research M, Vol. 96, 169-179, 2020.
doi:10.2528/PIERM20062903
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