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Design and performance of an HTS wideband microstrip bandpass filter at X‐band
Author(s) -
Shang Zhaojiang,
Guo Xubo,
Cao Bisong,
Zhang Xiaoping,
Wei Bin,
Heng Yong,
Song Xiaoke,
Suo Guannan,
Wang Jingchen,
Li Qirong
Publication year - 2013
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.27485
Subject(s) - band pass filter , microstrip , wideband , return loss , materials science , insertion loss , resonator , capacitive sensing , microwave , bandwidth (computing) , optoelectronics , filter (signal processing) , electronic engineering , electrical engineering , engineering , telecommunications , antenna (radio)
This article presents a 10‐pole high‐temperature superconducting (HTS) wideband microstrip bandpass filter with a novel configuration and compact size.The filter at 10 GHz with a fractional bandwidth of 40% is designed and fabricated on a 32.6 mm × 6.7 mm × 0.5 mm MgO substrate with double‐sided YBCO films. The internal couplings between quarter‐wavelength resonators are realized by parallel‐coupled microstrip line (PCML) structure and capacitive open‐ended stubs. The strong external couplings required by wideband filter are realized by impedance steps and capacitive stubs. The measured results at 55 K, without any tuning, show a high performance. The insertion loss is less than 0.31 dB, the return loss is better than −14 dB, and the out‐of‐band rejection is higher than 70 dB. The overall measurements are in good agreement with the simulations. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1027–1029, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27485