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Design of ultra‐wideband bandpass filter using step‐impedance four‐mode resonator and aperture‐enhanced coupled structure
Author(s) -
Cai Peng
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.23184
Subject(s) - passband , resonator , band pass filter , filter (signal processing) , electronic engineering , microwave , wideband , optoelectronics , acoustics , materials science , engineering , physics , electrical engineering , telecommunications
A novel ultra‐wideband (UWB) bandpass filter (BPF) is proposed and implemented by using a four‐mode resonator, which has four resonant frequencies within the passband of the filter. By enhancing the coupling between the resonator and the input/output feed lines, an UWB BPF with six transmission poles is realized, although only one resonator is utilized. To alleviate the requirement on fabrication precision, aperture‐enhanced coupled lines are introduced to replace the parallel‐coupled lines in the filter. The fabricated filter exhibits good performances and the measured results show good agreement with the simulated results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 696–699, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23184