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Accurate measurement of the true plane-wave shielding effectiveness of thick polymer composite materials via rectangular waveguides

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dc.title Accurate measurement of the true plane-wave shielding effectiveness of thick polymer composite materials via rectangular waveguides en
dc.contributor.author Moučka, Robert
dc.contributor.author Goňa, Stanislav
dc.contributor.author Sedlačík, Michal
dc.relation.ispartof Polymers
dc.identifier.issn 2073-4360 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2019
utb.relation.volume 11
utb.relation.issue 10
dc.type article
dc.language.iso en
dc.publisher MDPI AG
dc.identifier.doi 10.3390/polym11101603
dc.relation.uri https://www.mdpi.com/2073-4360/11/10/1603
dc.subject electromagnetic shielding en
dc.subject waveguide en
dc.subject composite material en
dc.subject permittivity en
dc.subject permeability en
dc.description.abstract This paper presents a methodology for accurately gauging the true plane wave shielding effectiveness of composite polymer materials via rectangular waveguides. Since the wave propagation of the waveguides is not in the form of plane wave patterns, it is necessary to post-process the S-parameters for the measured data of the waveguide lines to obtain such patterns and ascertain the effectiveness of true plane wave shielding. The authors propose two different methods to achieve this. The first applies simple renormalization of S-parameters, where reference impedance is changed from the value for the waveguide to that for free space, which ensures good accuracy of shielding effectiveness with a small degree of discontinuity across the range of frequencies. The other relies on rigorous extraction of the composite materials' effective permittivity and permeability ascertained from rectangular waveguides; afterward, plane wave shielding effectiveness is calculated analytically and gives very high accuracy. Both procedures assume the given samples are isotropic in character. We validated the accuracy of the methodologies by conducting tests on a set of synthetic samples of 2 mm thickness with unit permittivity and variable conductivity and on a dielectric material of known permittivity (FR4 laminate). The applicability of both methods was further proven by analyzing the isotropic composite materials, a process involving the use of iron particles embedded in a dielectric matrix. The synthetic samples and an FR4 material were tested to check the accuracy of the methods. Based on numerical studies and measurements, we concluded that materials with a shielding effectiveness of up to 25 dB could be measured at a maximum amplitude error of 1 dB to 3dB to a frequency of 18 GHz, depending on the relative permittivity of the material; hence, the first method was suitable for approximation purposes. For maximal accuracy, the second method typically demonstrated an amplitude error of below 0.5 dB to the same frequency across the entire range. © 2019 by the authors. Licensee MDPI, Basel, Switzerland. en
utb.faculty University Institute
utb.faculty Faculty of Applied Informatics
dc.identifier.uri http://hdl.handle.net/10563/1009229
utb.identifier.obdid 43880073
utb.identifier.scopus 2-s2.0-85073424990
utb.identifier.wok 000495382700072
utb.identifier.pubmed 31581519
utb.source j-scopus
dc.date.accessioned 2019-11-20T10:30:31Z
dc.date.available 2019-11-20T10:30:31Z
dc.description.sponsorship Czech Science FoundationGrant Agency of the Czech Republic [17-24730S]; Ministry of Education, Youth, and Sports of the Czech Republic-under the programme NPU I [LO1504]; project entitled Support of Sustainability and Development by the Centre for Security, Information and Advanced Technologies [LO1303]
dc.rights Attribution 4.0 International
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.rights.access openAccess
utb.ou Centre of Polymer Systems
utb.ou CEBIA-Tech
utb.contributor.internalauthor Moučka, Robert
utb.contributor.internalauthor Goňa, Stanislav
utb.contributor.internalauthor Sedlačík, Michal
utb.fulltext.affiliation Robert Moučka 1, Stanislav Goňa 2, Michal Sedlačík 1* 1 Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Trida T. Bati 5678, 760 01 Zlín, Czech Republic; moucka@utb.cz 2 Faculty of Applied Informatics, Tomas Bata University in Zlín, Nad Stráněmi 4511, 760 05 Zlín, Czech Republic; gona@utb.cz * Correspondence: msedlacik@utb.cz; Tel.: +420-576-038-027
utb.fulltext.dates Received: 5 August 2019 Accepted: 27 September 2019 Published: 1 October 2019
utb.fulltext.sponsorship The authors wish to thank the Czech Science Foundation (17-24730S) for its financial support. This work was also supported by the Ministry of Education, Youth, and Sports of the Czech Republic—under the programme NPU I (LO1504), as well as the project entitled Support of Sustainability and Development by the Centre for Security, Information and Advanced Technologies (LO1303).
utb.wos.affiliation [Moucka, Robert; Sedlacik, Michal] Tomas Bata Univ, Univ Inst, Ctr Polymer Syst, Trida T Bati 5678, Zlin 76001, Czech Republic; [Gona, Stanislav] Tomas Bata Univ, Fac Appl Informat, Nad Stranemi 4511, Zlin 76005, Czech Republic
utb.scopus.affiliation Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Trida T. Bati 5678, Zlín, 760 01, Czech Republic; Faculty of Applied Informatics, Tomas Bata University in Zlín, Nad Stráněmi 4511, Zlín, 760 05, Czech Republic
utb.fulltext.projects 17-24730S
utb.fulltext.projects LO1504
utb.fulltext.projects LO1303
utb.fulltext.faculty University Institute
utb.fulltext.faculty Faculty of Applied Informatics
utb.fulltext.faculty University Institute
utb.fulltext.ou Centre of Polymer Systems
utb.fulltext.ou Centre of Polymer Systems
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Attribution 4.0 International Except where otherwise noted, this item's license is described as Attribution 4.0 International