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A design method for improvement of λ g /4 coupled‐line narrow bandpass filter response
Author(s) -
Prigent G.,
Rius E.,
Le Pennec F.,
Le Maguer S.
Publication year - 2003
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.11145
Subject(s) - band pass filter , resonator , microwave , microstrip , transmission line , line (geometry) , coupling (piping) , engineering , filter (signal processing) , electronic engineering , physics , electrical engineering , optoelectronics , topology (electrical circuits) , telecommunications , mathematics , mechanical engineering , geometry
This paper discusses various changes made in classical coupled‐line narrow bandpass filters to somehow improve frequency response. First, the resonator's strip width was broadened to improve the lines' unloaded Q factor. Second, the in/out coupled‐line sections were replaced by tapped‐line feeding. Finally, a transmission zero was added via a geometrical modification that favors nonadjacent resonator coupling. The theoretical and experimental results obtained with these microstrip filters are compared. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 121–125, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11145