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UHF Band Ultra-Narrowband Superconducting Filter With Double U-Type Secondary Coupling Structure

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8 Author(s)
Xinxiang Lu ; Dept. of Phys., Tsinghua Univ., Beijing, China ; Xubo Guo ; Shichao Jin ; Xiaoping Zhang
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A double U-type secondary coupling structure (DUSCS) is used for a compact ultra-narrowband filter in the ultra-high frequency (UHF) band. It can effectively reduce the coupling and thus spacing between coupled twin-spiral resonators. A six-pole superconducting filter at 600 MHz with a fractional bandwidth of 0.083% is designed and fabricated to validate this technique. The filter size is reduced by 15% compared with the filter designed without DUSCSs.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:19 ,  Issue: 11 )