Exact Design of a New Class of Generalized Chebyshev Low-Pass Filters Using Coupled Line/Stub Sections

A method for the design of a new class of distributed low-pass filters enables exact realization of the series short-circuited transmission lines, which are normally approximated via unit elements in other filter realizations. The filters are based upon basic sections using a pair of coupled lines,...

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Bibliographic Details
Published inIEEE transactions on microwave theory and techniques Vol. 63; no. 12; pp. 4355 - 4365
Main Authors Musonda, Evaristo, Hunter, Ian C.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.12.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Chebyshev approximation
Couplings
Distributed low-pass filters
Equivalent circuits
Filtering theory
generalized Chebyshev
Impedance
meander line
Microwave circuits
selectivity
TEM
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Summary:A method for the design of a new class of distributed low-pass filters enables exact realization of the series short-circuited transmission lines, which are normally approximated via unit elements in other filter realizations. The filters are based upon basic sections using a pair of coupled lines, which are terminated at one end in open-circuited stubs. The approach enables realization of transmission zeros at the quarter-wave frequency, hence giving improved stopband performance. A complete design theory starting from a distributed generalized Chebyshev low-pass prototype filter is presented. A design example demonstrates excellent performance in good agreement with theory.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2015.2492969