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A Superconducting Microstrip Ultra-Wideband (UWB) Bandpass Filter at VHF-Band

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7 Author(s)
Wei Chen ; Dept. of Phys., Tsinghua Univ., Beijing, China ; Xubo Guo ; Bisong Cao ; Xiaoping Zhang
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A compact superconducting ultra-wideband filter with a passband from 125 to 260 MHz is demonstrated. The filter consists of ten shunt short-circuited stubs separated by connecting lines. The short-circuited stubs are grounded via a grounding strip that is attached to the box wall by a number of SiAl bonding wires. The filter is realized on two 2 in YBCO/LaAlO3 substrates, which are connected by two bonding wires. The measured results demonstrate an insertion loss of less than 0.08 dB and a return loss of better than 21 dB without tuning. Furthermore, the experimental results of the filter are in good agreement with the simulated ones.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:19 ,  Issue: 10 )