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

doi:10.1088/1674-1056/27/6/068502

Abstract

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)

Fund:

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: weibin@mail.tsinghua.edu.cn

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

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