Compact ultra-narrowband superconducting filter using N-spiral resonator with open-loop secondary coupling structure

doi:10.1088/1674-1056/ab888d

Abstract A novel N-spiral resonator with open-loop secondary coupling structure (OLSCS) is proposed to realize a compact ultra-narrowband high temperature superconducting (HTS) filter. The coupling strength and polarity between the resonators can be significantly reduced and changed by introducing OLSCS, thus the required weak coupling can be achieved in a very compact size. A six-pole superconducting filter at 1701 MHz with a fractional bandwidth of 0.19% is designed to validate this method. The filter is fabricated on MgO substrate with a compact size of 15 mm×10 mm. The measured insertion loss is 0.79 dB, and the return loss is better than 17.4 dB. The experimental results show a good agreement with the simulations.

Keywords: bandpass filters high temperature superconducting (HTS) microstrip ultra-narrowband

Received: 20 January 2020
Revised: 31 March 2020
Accepted manuscript online:

PACS:

85.25.-j

(Superconducting devices)

Fund: Project supported by the National Key Scientific Instrument and Equipment Development Project of China (Grant No. 2014YQ030975).

Corresponding Authors: Bin Wei, Bisong Cao
E-mail: weibin@mail.tsinghua.edu.cn;bscao@tsinghua.edu.cn

Cite this article:

Lin Tao(陶琳), Bin Wei(魏斌), Xubo Guo(郭旭波), Hongcheng Li(李宏成), Chenjie Luo(骆晨杰), Bisong Cao(曹必松), Linan Jiang(姜立楠) Compact ultra-narrowband superconducting filter using N-spiral resonator with open-loop secondary coupling structure 2020 Chin. Phys. B 29 068502

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Compact ultra-narrowband superconducting filter using N-spiral resonator with open-loop secondary coupling structure

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