Analysis of Composite Textiles Filled with Arbitrarily Oriented Conducting Fibres Using a Periodic Model for Crossed Strips

Volskiy, Vladimir; Aerts, Wim; Vasylchenko, A.; Vandenbosch, G.A.E.

doi:10.1109/mmet.2006.1689700

Cited by 3 publications

(5 citation statements)

References 5 publications

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“…63,64 It should be noted that, being in free space, the variations in sample and environment geometry bring a certain degree of inaccuracy coming from diffraction around the sample and reflections from the working area surrounding the setup. 65,66 Therefore, a mathematical based software solution is then applied to remove the contribution due to scattering. Since diffracted and reflected waves will go through a longer path than the transmitted ones they will show up shifted in time with respect to the direct ones.…”

Section: Emse Measurement Via Free Space Measurement Techniquementioning

confidence: 99%

Comparison of electromagnetic shielding effectiveness of conductive single jersey fabrics with coaxial transmission line and free space measurement techniques

Tezel

Kavuşturan

Vandenbosch

et al. 2013

Textile Research Journal

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The aim of this study is to investigate the electromagnetic shielding effectiveness (EMSE) of thin and lightweight knitted fabrics that are suitable for casual wear like t-shirts. For the purpose of having a low production cost, metal/cotton conductive composite yarns are produced by a yarn doubling technique, involving stainless steel wires (35 m, 50 m) or copper wires (50 m, 70 m) and Ne30/1, Ne40/1, Ne60/2, Ne80/2 count cotton yarns. Single jersey fabrics are knitted on an E20 circular knitting machine with the same machine settings. Coaxial transmission line and free space measurement (by using an anechoic chamber) techniques are used for the EMSE measurements in the frequency range of 100 MHz-1.5 GHz and 1 GHz-18 GHz respectively. The free space measurement technique test results reveal that single jersey knitted fabrics have EMSE ability for the electric field polarization in the same direction as the main direction of the conductive metal wires in the fabric. It is observed that all single jersey fabric structures have more than 7 dB (80% or better) EMSE for GSM-850 and GSM-900 cellular phone communication bands according to coaxial transmission line equipment test results. SNK test results of both test methods reveal that, while 100% cotton fabrics do not have EMSE ability, cotton yarn count is highly significant on the EMSE of single jersey fabrics with conductive composite yarns. Fabrics with two-ply fine cotton yarns (Ne60/2 and Ne80/2) have higher EMSE values than the fabrics with one-ply cotton yarn of the same yarn count (Ne30/1 and Ne40/1).

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Section: Emse Measurement Via Free Space Measurement Techniquementioning

confidence: 99%

Comparison of electromagnetic shielding effectiveness of conductive single jersey fabrics with coaxial transmission line and free space measurement techniques

Tezel

Kavuşturan

Vandenbosch

et al. 2013

Textile Research Journal

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“…EMSE measurements were conducted in an anechoic chamber by using the free space measurement technique because of its high reproducibility and accuracy [45][46][47][48].…”

Section: Emse Measurementsmentioning

confidence: 99%

“…A dedicated mathematical algorithm was applied to remove the contribution due to scattering. More information can be found in [11,[45][46][47][48]52]. EMSE properties of fabrics were measured in both horizontal, and vertical directions (Figure 2) related to the electric field polarization of the antennas.…”

Section: Emse Measurementsmentioning

confidence: 99%

“…In other words, the electromagnetic noise caused by the environment affects the test accuracy. In this study the free space measurement technique by using an anechoic chamber was preferred for the EMSE measurements because of its high reproducibility and accuracy [45][46][47][48]. Therefore, the noise caused by the environment was eliminated.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Knitting Structure and Metal Wire Amount on Electromagnetic Shielding Effectiveness of Knitted Fabrics

Tezel

Kavuşturan

Vandenbosch

et al. 2023

Tekstil Ve Konfeksiyon

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The aim of this study is to investigate the influence of knitting structure and metal wire amount on the electromagnetic shielding effectiveness (EMSE) of knitted fabrics comparatively. Single jersey, single pique, weft locknit, and cross miss fabrics involving stainless steel or copper wires were produced on a flat knitting machine. A free space measurement technique was used for the EMSE measurements in an anechoic chamber. The variance analysis results of the EMSE values reveal that the effect of knitting structure, metal wire type, metal wire amount, and incident wave frequency is highly significant. It was observed that fabrics with tuck and miss loop structures had higher EMSE values than single jersey fabrics. It was found that single pique fabrics had higher EMSE values than single jersey fabrics that contain twice as much metal wire. It indicates that changing the knitting structure is more effective than changing the metal wire amount.

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“…To simplify the simulations, only the wiregrid structure of the fabric model [2] was considered. It is not a composite structure with several layers of fibers but with only one layer of crossed fibers with a diameter t = 28 μm.…”

Section: Determination Of S V To Achieve the Required Se Of The Compomentioning

confidence: 99%

Assessment of Shielding Effectiveness and Percolation Threshold of Composite Materials

Skocik¹,

Korbel²

2017

DAAAM Proceedings

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This paper deals with the protection of avionics of small airplanes in an electromagnetic environment. Various composite materials are used for this purpose. The mechanical properties of these materials are very well described. On the other hand, the electrical properties are described insufficiently. A fabric with long copper-plated polyamide fibers was selected as a suitable shielding material. The aim is to verify the shielding effectiveness of the fabric by measuring the transverse electromagnetic wave on the coaxial line. Further, determine the flat fiber concentration required to achieve a certain shielding efficiency of given composite sample and its percolation threshold which is an important parameter determining the conductivity of the composite material. It is therefore possible to determine the critical content of the filler in which the composite material starts to act as a conductor.

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Analysis of Composite Textiles Filled with Arbitrarily Oriented Conducting Fibres Using a Periodic Model for Crossed Strips

Cited by 3 publications

References 5 publications

Comparison of electromagnetic shielding effectiveness of conductive single jersey fabrics with coaxial transmission line and free space measurement techniques

Comparison of electromagnetic shielding effectiveness of conductive single jersey fabrics with coaxial transmission line and free space measurement techniques

Influence of Knitting Structure and Metal Wire Amount on Electromagnetic Shielding Effectiveness of Knitted Fabrics

Assessment of Shielding Effectiveness and Percolation Threshold of Composite Materials

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