Inline Microwave Filters With N+1 Transmission Zeros Generated by Frequency-Variant Couplings: Coupling-Matrix-Based Synthesis and Design

Martyna Mul; Maciej Jasiński; Adam Lamęcki; Roberto Gómez-García; Michał Mrozowski

doi:10.1109/tcsii.2021.3125460

Inline Microwave Filters With N+1 Transmission Zeros Generated by Frequency-Variant Couplings: Coupling-Matrix-Based Synthesis and Design

Abstract

A general coupling-matrix-based synthesis methodology for inline Nth-order microwave bandpass filters (BPFs) with frequency-variant reactive-type couplings that generate N+1 transmission zeros (TZs) is presented in this brief. The proposed approach exploits the formulation of the synthesis problem as three inverse nonlinear eigenvalue problems (INEVPs) so that the coupling matrix is built from their sets of eigenvalues. For this purpose, an optimization nonlinear least-squares procedure is employed. The theoretical foundations of the engineered INEVP coupling-matrix-based synthesis framework are described. In addition, its effectiveness is verified through various synthesis examples of a third-order BPF with four TZs based on different circuit models. Moreover, as experimental validation, a 2.4-GHz microstrip prototype of the distributed-element BPF synthesis example is built and measured.

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Authors (5)

Martyna Mul mgr inż.
Maciej Jasiński
Adam Lamęcki dr hab. inż.
Roberto Gómez-García prof.
- University of Alcala
Michał Mrozowski prof. dr hab. inż.

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DOI:: Digital Object Identifier (open in new tab) 10.1109/TCSII.2021.3125460
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Keywords

BANDPASS FILTER (BPF), COUPLING MATRIX, FILTER SYNTHESIS, MICROSTRIP FILTER, MICROWAVE FILTER, NONLINEAR EIGENVALUE PROBLEM (NEVP), RF FILTER, TRANSMISSION ZERO (TZ)S.

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Articles

Type:

artykuły w czasopismach

Published in:

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS no. 69, pages 824 - 828,
ISSN: 1549-7747

Language:

English

Publication year:

2022

Bibliographic description:

Mul M., Jasiński M., Lamęcki A., Gómez-García R., Mrozowski M.: Inline Microwave Filters With N+1 Transmission Zeros Generated by Frequency-Variant Couplings: Coupling-Matrix-Based Synthesis and Design// IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS -Vol. 69,iss. 3 (2022), s.824-828

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