Accurate Synthesis of Extracted-Pole Filters by Topology Transformations

This letter presents a novel, simpler, and more accurate synthesis method for inline extracted-pole low-pass prototype filters. At the present, this topology is only synthesized by using section extraction or optimization methods, known to suffer from accuracy problems, especially for high-order fil...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 31; no. 1; pp. 13 - 16
Main Authors Mejillones, Steven Caicedo, Oldoni, Matteo, Moscato, Stefano, Macchiarella, Giuseppe, D'Amico, Michele, Gentili, G. G.
Format Journal Article
LanguageEnglish
Published IEEE 01.01.2021
Subjects
Capacitance
Couplings
Elliptic filters
extracted-pole synthesis
Inverters
Prototypes
Robustness
Topology
topology transformation
Wheels
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Summary:This letter presents a novel, simpler, and more accurate synthesis method for inline extracted-pole low-pass prototype filters. At the present, this topology is only synthesized by using section extraction or optimization methods, known to suffer from accuracy problems, especially for high-order filters. The method described in this letter relies on the robustness and accuracy of the coupling-matrix synthesis methods by using it as a first step. The second step is instead a transformation to obtain the desired inline extracted-pole topology. Three synthesis examples are presented to validate the novel synthesis procedure.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2020.3035870