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

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).

Wu Di1, Wei Bin1, †, Li Bo1, Guo Xu-Bo1, Lu Xin-Xiang2, Cao Bi-Song1
       

Layout of the four-pole filter.