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Five‐order narrow‐band tunable superconducting filter
Author(s) -
Cui Hongyu,
Ji Laiyun
Publication year - 2019
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.21820
Subject(s) - center frequency , materials science , bandwidth (computing) , filter (signal processing) , optoelectronics , superconductivity , microstrip , diode , band pass filter , varicap , insertion loss , biasing , voltage , optics , electrical engineering , physics , telecommunications , electrode , capacitance , computer science , engineering , condensed matter physics , quantum mechanics
This article designed a five‐order narrow‐band tunable superconducting filter. The superconducting microstrip circuit was loaded by varactors diode. The center frequency of the tunable can be tuned through the changing of the bias voltage added in the varactors diode. The whole device has a parallel coupling structure and the filter circuit was fabricated by DyBa 2 Cu 3 O 7 superconducting film with 0.5 mm thickness and 2 in. LaAlO 3 as the substrate. The frequency can be continuously adjusted from 235 MHz to 250 MHz. The insertion loss of the filter was in the range of 2.51 dB to 9.64 dB. The bandwidth of the tunable filter was in the range of 0.5 MHz to 0.9 MHz. The out‐of‐band rejection was better than 70 dB. The measured results are in good agreement with the simulated ones.