Abstract
The paper proposes the analytic modelling of flexible textile shields made of fabrics with inserted conductive yarns and metallic plasma coating in order to calculate their electromagnetic shielding effectiveness (EMSE). This manufacturing process is highly innovative, since copper plasma coating improves EMSE on the fabrics with inserted conductive yarns of stainless steel and silver with 10–15 dB in the frequency range of 0.1–1000 MHz, as shown by the measured EMSE values determined according to the standard ASTM ES-07 via the Transverse Electromagnetic (TEM) cell. On the other hand, modelling of EMSE for such conductive flexible shields gives an insight on estimating EMSE in the design phase of manufacturing the shield, based on its geometric and electrical parameters. An analytic model was proposed based on the sum of EMSE of the fabric with inserted conductive yarns and EMSE of the copper coating. The measurement results show close values to the proposed analytic model, especially in case of fabric with conductive yarns having stainless steel content.
Highlights
The shielding of electromagnetic non-ionizing radiation by means of flexible textile materials is a well-established field of research in the current context
A second topic is given by imparting additional functionalities to EMI shielding: electroless plating was used to deposit Co and Ni coating on Tencel fabrics for enhanced EMI shielding properties and corrosion resistance properties [9]
For woven fabrics with inserted conductive yarns, due to their mesh grid structure, the impedance method with correction factors was adapted [19]. Another analytic relation establishes a weighted sum between the electromagnetic shielding effectiveness (EMSE) of the layer and the EMSE of the grid [20]. These relations were applied for Transverse Electromagnetic (TEM) cell measured fabric samples by [21], taking into consideration reflection as the main component of EMSE
Summary
The shielding of electromagnetic non-ionizing radiation by means of flexible textile materials is a well-established field of research in the current context. These relations were applied for Transverse Electromagnetic (TEM) cell measured fabric samples by [21], taking into consideration reflection as the main component of EMSE Another shielding model was developed for mesh grid structures, based on the analogy with an RLC electric circuit with lumped elements [22]. The aim of our research is to model EMSE for this new type of conductive fabric with inserted conductive yarns in warp and weft direction and conductive plasma coating based on the sum of each conductive structure contributing to EMSE, namely the woven fabric with inserted conductive yarns and the copper coating on both sides of the fabric The validation of these proposed analytic relations was conducted through electric sheet resistivity measurements and EMSE measurements via the TEM cell according to ASTM ES-07 standard. The woven fabrics based on cotton yarns with inserted conductive yarns were manufactuTrhede awtoSvCeMn faajubtreicxsSbRaLs,eBdaornnocvoattIoansi.ySatranisnlwesisthstienesleyraterdnsc(oBnedkuincotixvBe Kya5r0n/s2w) aenred msilavne-r uyfaarcntus r(eSdtaatetxS1C17M/a1j7utdetxexS)RwL,erBeairnnsoevrateIdasbio. tShtaiinnlwesasrpstaeenldywarenfst s(yBsetkeimnooxnBtKhe5w0/e2a) vainndg sliolvoemr yoaf rtynps e(SStOatMexE1T17w/1id7thdt1e.x9)0wme.rTehineswerotevdenbfoatbhriincswwaerrpe adnedsigwneefdt swysitthemplaoinntwheeawveeafvo-r iangsimlopomle aonfdtyepffieciSeOnMt sEtrTucwtuidrethof1E.9M0 msh.ieTlhdes, wwohvileenthfaebbraicssicwsuerpepodretsyiganrendwwasitohf p1l0a0i%n wcoetatvoenfNorma 5si0m/2p.leTawnodteyfpfiecsieonftwstorvuectnufraeborficEsMwsithhieinldsse,rwtehdilceotnhdeubcatsivicesyuaprpnosrotfysatraninwleasss osfte1e0l0(%F1c) oatntodnsiNlvmer 5(F03/2).rTeswuoltetdyp, hesavoifnwg oavmenesfhabgrriicdsdwisittahnicnesoerft5edmcmo.nductive yarns of stainless steel (F1) and silver (F3) resulted, having a mesh grid distance of 5 mm
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