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Transmission Line Filters with Harmonic Parallel Foster Sections
Author(s) -
Malherbe Johannes A. G.,
Luus Pierre D.,
Uys Johan C.
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.27736
Subject(s) - resonator , microwave , transmission line , wideband , harmonic , electric power transmission , electronic engineering , shunt (medical) , bandwidth (computing) , microwave transmission , topology (electrical circuits) , acoustics , engineering , computer science , electrical engineering , physics , telecommunications , medicine , cardiology
Conventional wideband bandstop filters use Cauer prototypes, but become nonrealizable with Kuroda–Levy transforms for bandwidths of 150% or more. Transmission line filters with harmonic stubs have been shown to be realizable at these bandwidths, but have limited performance ranges due to the fixed positions of the transmission zeros. In this article, two structures that use shunt Foster resonators that enable the shift of the transmission zeros are described. Simulated and measured properties show that greatly improved performance can be realized while not adding to the complexity of the structure. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1724–1728, 2013