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Design of a moderate‐wideband superconducting filter with modified stub structure
Author(s) -
Lu Xinxiang,
Guo Xubo,
Heng Yong,
Luo Chenjie,
Wei Bin,
Zhang Liuwan,
Cao Bisong
Publication year - 2018
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.21220
Subject(s) - stub (electronics) , wideband , resonator , fractional bandwidth , materials science , electrical impedance , bandwidth (computing) , wafer , electronic engineering , superconductivity , acoustics , optoelectronics , equivalent circuit , electrical engineering , physics , computer science , engineering , voltage , telecommunications , condensed matter physics
This paper presents a design method for moderate‐wideband filters with modified λ/2 stub resonators mid‐tapped by λ/4 connecting lines which act as admittance inverters. The modified tapped‐stubs avoid low characteristic impedances of the stubs which results in a very wide strip‐width and a large circuit size. An example filter at 2250 MHz with a fractional bandwidth (FBW) of 45% is successfully designed with this method and fabricated. It has a compact size of 26.5 mm × 10.5 mm on a YBCO/LaAlO 3 superconducting wafer. The measurements show good response and match well with the simulations.