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Tri-band superconducting bandpass filter with high selectivity

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8 Author(s)
Yong Heng ; Dept. of Phys., Tsinghua Univ., Beijing, China ; Xubo Guo ; Bisong Cao ; Bin Wei
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A tri-band superconducting filter at L-band comprising three high-pole single-band sub-filters with sharp band-edges is presented to meet the high selectivity requirement. Matching junctions with high-impedance branch lines are used to connect the sub-filters and to reduce the channel interactions. MgO and LaAlO3 substrates are utilised in the design and fabrication procedure to reduce the filter size and achieve a high performance. The whole filter has a compact size of 43 × 39.1 mm, and the measured results match well with the simulations.

Published in:

Electronics Letters  (Volume:49 ,  Issue: 10 )