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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2018-06-05
Design of Ultra-Narrowband Miniaturized High Temperature Superconducting Bandpass Filter
By
Liguo Zhou,

    Dr. Liguo Zhou

    School of Astronautics and Aeronautics

    University of Electronic Science and Technology of China

    China

    Homepage

Zhihe Long,

    Dr. Zhihe Long

    School of Communication and Information Engineering

    University of Electronic Science and Technology of China

    China

    Homepage

Hui Li,

    Dr. Hui Li

    School of Astronautics and Aeronautics

    University of Electronic Science and Technology of China

    China

    Homepage

Hang Wu,

    Dr. Hang Wu

    School of Astronautics and Aeronautics

    University of Electronic Science and Technology of China

    China

    Homepage

Tianliang Zhang,

    Prof. Tianliang Zhang

    School of Astronautics and Aeronautics

    University of Electronic Science and Technology of China

    China

    Homepage

Man Qiao

    Dr. Man Qiao

    School of Communication and Information Engineering

    University of Electronic Science and Technology of China

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 76, 105-111, 2018
doi:10.2528/PIERL18021004 | Google Scholar

Abstract
This paper proposes a novel clip-shaped meander-line resonator (CSMLR) to realize miniaturized ultra-narrowband (UNB) bandpass filter design. The main advantage is that it can achieve very weak coupling between adjacent resonators with keeping them very close and introduce transmission zeros (TZs). To further demonstrate the feasibility of using this configuration, a six-pole UNB filter with a fractional bandwidth (FWB) of 0.20% at the center frequency of 1915 MHz was designed on double-sided YBCO high temperature superconducting (HTS) thin films with a thickness of 0.5 mm and dielectric constant of 9.8 by using CSMLR. The measured responses agree rather well with the simulated ones. The measured results show a maximum insertion loss of 0.31 dB and return loss of 15.5 dB in the passband. Two transmission zeroes (TZs) are generated to improve the passband selectivity, which causes the band-edge steepness better than 50 dB/MHz in both transition bands.
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Citation
Liguo Zhou, Zhihe Long, Hui Li, Hang Wu, Tianliang Zhang, and Man Qiao, "Design of Ultra-Narrowband Miniaturized High Temperature Superconducting Bandpass Filter," Progress In Electromagnetics Research Letters, Vol. 76, 105-111, 2018.
doi:10.2528/PIERL18021004
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