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Dual‐mode square ring resonators for design of millimeter‐wave ultra‐wideband bandpass filter
Author(s) -
Cai Peng,
Ma Zhewang,
Guan Xuehui,
Zhang Yong,
Chen Bin,
Xu Bo
Publication year - 2008
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.23237
Subject(s) - passband , band pass filter , resonator , stopband , elliptic filter , electronic engineering , ultra wideband , extremely high frequency , microwave , wideband , butterworth filter , engineering , acoustics , physics , electrical engineering , filter (signal processing) , prototype filter , telecommunications , filter design
In this article, a millimeter‐wave ultra‐wideband (UWB) bandpass filter is proposed and implemented by cascading two dual‐mode square ring resonators loaded with λ 0 /4 and 3λ 0 /4 open tuning stubs, aiming at transmitting the signals in the UWB passband of 22–29 GHz. Formulae based on even‐ and odd‐mode analysis are derived to facilitate the design of transmission zeros of these ring resonators. Because of the transmission zeros in the lower and upper stopbands, the proposed filter exhibits sharp attenuations near the passband as well as very wide stopband. The measured responses of the filter agree well with the design simulation, and satisfy well the Federal Communications Commission's indoor limit on millimeter‐wave UWB applications over very wide frequency band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 879–883, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23237