Simulation and experimental study of a non-reflective filter based on a strip three-wire coupled line
DOI: 10.21293/1818-0442-2025-28-2-55-61
Abstract: The COMSOL Multiphysics system simulates a non-reflective filter with a three-wire coupled strip line and concentrated RLC elements. The dependence of frequency characteristics of the coupled lines on the thickness of the dielectric layer separating the coupled current-carrying strips from the third conductor, as well as on the gap between the current-carrying strips, is investigated. It is shown that the introduction of an additional strip with a floating potential makes it possible to obtain a strong electromagnetic coupling between the current-carrying strips, which is necessary to obtain the required characteristics of nonreflective filters. An experimental study of the frequency characteristics of the non-reflective filter is carried out. The paper proposes a filter design with improved characteristics achieved by optimizing parameters of the coupled line with an additional strip line. The theoretical relevance of the paper is in the insights it offers regarding the effect of geometric parameters on the electromagnetic properties of coupled lines. Its practical value is in the creation of non-reflective filter for radio engineering systems that require additional measures to reduce reflections between cascades.
Keywords: three-wire coupled lines, concentrated RLC elements, non-reflective filter, frequency characteristics
Funding: This work was supported by the Ministry of Science and Higher Education of the Russian Federation under project No. FEWM-2023-0014 dated January 16, 2023.
For citation:
Arutyunyan A. A. Simulation and experimental study of a non-reflective filter based on a strip three-wire coupled line. Doklady Tomskogo gosudarstvennogo universiteta sistem upravleniya i radioelektroniki, 2025, vol. 28, no. 2, pp. 55–61. DOI: 10.21293/1818-0442-2025-28-2-55-61
Authors and copyright holders:
- Arutyunyan A. A. , Tomsk State University of Control Systems and Radioelectronics (Tomsk, Russia)
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