中国物理B ›› 2026, Vol. 35 ›› Issue (6): 68501-068501.doi: 10.1088/1674-1056/ae13eb

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Tri-band high temperature superconducting filter with a wide stopband designed using a step impedance hairpin ring resonator

Zhaojiang Shang(商兆江)1, Weijin Yang(杨伟进)1, Yan Zhang(张艳)1, and Liguo Zhou(周立国)2,†   

  1. 1 College of Science, Shanghai Institute of Technology, Shanghai 201418, China;
    2 School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • 收稿日期:2025-06-04 修回日期:2025-09-21 接受日期:2025-10-16 发布日期:2026-06-05
  • 通讯作者: Liguo Zhou E-mail:zlg@usst.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61901270 and 62201464).

Tri-band high temperature superconducting filter with a wide stopband designed using a step impedance hairpin ring resonator

Zhaojiang Shang(商兆江)1, Weijin Yang(杨伟进)1, Yan Zhang(张艳)1, and Liguo Zhou(周立国)2,†   

  1. 1 College of Science, Shanghai Institute of Technology, Shanghai 201418, China;
    2 School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2025-06-04 Revised:2025-09-21 Accepted:2025-10-16 Published:2026-06-05
  • Contact: Liguo Zhou E-mail:zlg@usst.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61901270 and 62201464).

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摘要： A high-temperature superconducting (HTS) tri-band bandpass filter with a step impedance hairpin ring resonator (SIHRR) was designed. The filter adopts the parallel mode of the loop resonator and the U-type step impedance resonator. The resonance mechanism of the resonator was studied, and the filter research process is described in detail. The three passbands can be independently adjusted by introducing an H-shaped secondary coupling structure. Finally, a third-order HTS filter with center frequencies and bandwidths of 3490 MHz (3.6%), 4290 MHz (3.4%), and 5190 MHz (5.1%) was successfully fabricated using photolithography and ion etching. The obtained filter had an out-of-band rejection of more than 37 dB up to 12 GHz, and the measurement results were in good agreement with the simulation results. Moreover, the structure of the filter is compact, with dimensions of 14 mm $\times$18 mm, which is equal to 0.53 $\lambda_{\rm g }\times0.3 \lambda_{\rm g}$.

关键词: high-temperature superconducting, secondary coupling structure, SIHRR, tri-band bandpass filter

Abstract: A high-temperature superconducting (HTS) tri-band bandpass filter with a step impedance hairpin ring resonator (SIHRR) was designed. The filter adopts the parallel mode of the loop resonator and the U-type step impedance resonator. The resonance mechanism of the resonator was studied, and the filter research process is described in detail. The three passbands can be independently adjusted by introducing an H-shaped secondary coupling structure. Finally, a third-order HTS filter with center frequencies and bandwidths of 3490 MHz (3.6%), 4290 MHz (3.4%), and 5190 MHz (5.1%) was successfully fabricated using photolithography and ion etching. The obtained filter had an out-of-band rejection of more than 37 dB up to 12 GHz, and the measurement results were in good agreement with the simulation results. Moreover, the structure of the filter is compact, with dimensions of 14 mm $\times$18 mm, which is equal to 0.53 $\lambda_{\rm g }\times0.3 \lambda_{\rm g}$.

Key words: high-temperature superconducting, secondary coupling structure, SIHRR, tri-band bandpass filter

中图分类号:  (Superconducting devices)

  • 85.25.-j