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 in:IEEE microwave and wireless components letters 2021-01, Vol.31 (1), p.13-16
Main Authors: Mejillones, Steven Caicedo, Oldoni, Matteo, Moscato, Stefano, Macchiarella, Giuseppe, D'Amico, Michele, Gentili, G. G.
Format: Article
Language:English
Subjects:
Capacitance
Couplings
Elliptic filters
extracted-pole synthesis
Inverters
Low pass filters
Optimization
Prototypes
Robustness
Synthesis
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
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2020.3035870