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Chin. Phys. B, 2018, Vol. 27(6): 068502    DOI: 10.1088/1674-1056/27/6/068502

Compact wide stopband superconducting bandpass filter using modified spiral resonators with interdigital structure

Di Wu(吴荻)1, Bin Wei(魏斌)1, Bo Li(李博)1, Xu-Bo Guo(郭旭波)1, Xin-Xiang Lu(卢新祥)2, Bi-Song Cao(曹必松)1
1 State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China;
2 Department of Physics and Electronic Engineering, Shaoxing University, Shaoxing 312000, China

In this study, we propose a novel resonator that is composed of a modified spiral with an embedded interdigital capacitor. A large ratio of the first spurious frequency to the fundamental resonant frequency is obtained, which is suitable for the design of filters with wide stopbands, and the circuit size is considerably reduced by embedding the interdigital structure in the spiral. For demonstration, a compact four-pole high temperature superconducting (HTS) filter with a center frequency of 568 MHz is designed and fabricated on double-sided YBCO film with a size of 11.4 mm×8.0 mm. The filter measurement shows excellent performance with an out-of-band rejection level better than 60.9 dB up to 3863 MHz.

Keywords:  high-temperature superconducting      bandpass filter      microstrip filter      wide stopband  
Received:  31 January 2018      Revised:  26 March 2018      Accepted manuscript online: 
PACS:  85.25.-j (Superconducting devices)  

Project supported by the National Key Scientific Instrument and Equipment Development Project,China (Grant No.2014YQ030975) and the National Natural Science Foundation of China (Grant Nos.61371009 and 61401282).

Corresponding Authors:  Bin Wei     E-mail:

Cite this article: 

Di Wu(吴荻), Bin Wei(魏斌), Bo Li(李博), Xu-Bo Guo(郭旭波), Xin-Xiang Lu(卢新祥), Bi-Song Cao(曹必松) Compact wide stopband superconducting bandpass filter using modified spiral resonators with interdigital structure 2018 Chin. Phys. B 27 068502

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