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

doi:10.1088/1674-1056/ab888d

中国物理B ›› 2020, Vol. 29 ›› Issue (6): 68502-068502.doi: 10.1088/1674-1056/ab888d

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

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

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)

State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China

收稿日期:2020-01-20 修回日期:2020-03-31 出版日期:2020-06-05 发布日期:2020-06-05
通讯作者: Bin Wei, Bisong Cao E-mail:weibin@mail.tsinghua.edu.cn;bscao@tsinghua.edu.cn
基金资助:
Project supported by the National Key Scientific Instrument and Equipment Development Project of China (Grant No. 2014YQ030975).

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

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)

State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China

Received:2020-01-20 Revised:2020-03-31 Online:2020-06-05 Published:2020-06-05
Contact: Bin Wei, Bisong Cao E-mail:weibin@mail.tsinghua.edu.cn;bscao@tsinghua.edu.cn
Supported by:
Project supported by the National Key Scientific Instrument and Equipment Development Project of China (Grant No. 2014YQ030975).

摘要/Abstract

摘要： 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.

关键词: bandpass filters, high temperature superconducting (HTS), microstrip, ultra-narrowband

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.

Key words: bandpass filters, high temperature superconducting (HTS), microstrip, ultra-narrowband

中图分类号: (Superconducting devices)

85.25.-j

陶琳, 魏斌, 郭旭波, 李宏成, 骆晨杰, 曹必松, 姜立楠. Compact ultra-narrowband superconducting filter using N-spiral resonator with open-loop secondary coupling structure[J]. 中国物理B, 2020, 29(6): 68502-068502.

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[J]. Chin. Phys. B, 2020, 29(6): 68502-068502.

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

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

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