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High‐performance narrowband superconducting filters with high Q resonators at X‐band
Author(s) -
Song Xiaoke,
Wei Bin,
Cao Bisong,
Zhang Xiaoping,
Guo Xubo,
Zhang Guoyong,
Xu Zhan
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28381
Subject(s) - return loss , insertion loss , resonator , narrowband , materials science , microwave , distributed element filter , electrical impedance , filter (signal processing) , bandwidth (computing) , optoelectronics , band pass filter , prototype filter , electrical engineering , electronic engineering , physics , optics , low pass filter , telecommunications , engineering , antenna (radio)
This paper presents two narrowband high‐temperature superconducting (HTS) filters at 10 GHz with a 0.6% fractional bandwidth. Uniform impedance rectangular resonator (UIRR) and stepped impedance H‐type resonator (SIHR) are proposed to achieve HTS filters with high Q value, low sensitivity, weak coupling, and good parasitic response. A six‐pole HTS filter that has UIRRs with a Q value of 17,700 is fabricated; this filter has a 19.9 dB return loss and a 0.38 dB insertion loss. An eight‐pole HTS filter that has SIHRs with a Q value of 12,100 is also manufactured; this filter has a 12.2 dB return loss and a 0.64 dB insertion loss. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1516–1520, 2014