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Compact high‐selectivity high‐temperature superconducting wideband bandpass filter using triple‐mode stub‐loaded loop resonator
Author(s) -
Tian Hongliang,
Chen Zhijiao,
Liu Haiwen,
Song Yi
Publication year - 2021
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22715
Subject(s) - stub (electronics) , band pass filter , passband , resonator , wideband , materials science , insertion loss , bandwidth (computing) , selectivity , optoelectronics , physics , electronic engineering , telecommunications , chemistry , computer science , optics , engineering , biochemistry , catalysis
Abstract A triangle triple‐mode stub‐loaded loop resonator (SLLR) is proposed in this letter and used for wideband filter design. Also, this SLLR can produce multiple transmission zeros for high‐selectivity bandpass filter (BPF) design without adding extra circuit unit. To verify the unique characteristics of the proposed SLLR, a compact wideband BPF is designed and fabricated using high‐temperature superconducting YBCO thin films on a MgO substrate. Furthermore, a novel meander structure is introduced to realize compact size and strong input/output coupling design. The measured results show that the 3‐dB fractional bandwidth is of 50.6% (2.55‐4.28 GHz), and the selectivity factor of the passband is 0.87 with a maximum insertion loss of 0.07 dB, indicating good agreement with the theoretical expectation.