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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 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 |
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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 $\lambda_{\rm g }\times0.3 \lambda_{\rm g}$.
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Received: 04 June 2025
Revised: 21 September 2025
Accepted manuscript online: 16 October 2025
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PACS:
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85.25.-j
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(Superconducting devices)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61901270 and 62201464). |
Corresponding Authors:
Liguo Zhou
E-mail: zlg@usst.edu.cn
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Cite this article:
Zhaojiang Shang(商兆江), Weijin Yang(杨伟进), Yan Zhang(张艳), and Liguo Zhou(周立国) Tri-band high temperature superconducting filter with a wide stopband designed using a step impedance hairpin ring resonator 2026 Chin. Phys. B 35 068501
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