Abstract
In this study, stainless steel, copper, and silver wires were intermingled with two polyamide 6.6 filaments through the commingling technique to produce three-component hybrid yarns. The produced hybrid yarns were used as weft in the structure of plain woven fabric samples. The electromagnetic shielding effectiveness parameters of samples were measured in the frequency range of 0.8–5.2 GHz by the free space technique. The effects of metal hybrid yarn placement, number of fabric layers, metal types, and wave polarization on the electromagnetic shielding effectiveness and absorption and reflection properties of the woven fabrics were analyzed statistically at low and high frequencies separately. As a result, the samples have no shielding property in the warp direction. Metal types show no statistically significant effect on electromagnetic shielding effectiveness. However, fabrics containing stainless steel have a higher absorption power ratio than copper and silver samples. Double-layer samples have higher electromagnetic shielding effectiveness values than single-layer fabrics in both frequency ranges. However, the number of layers does not have a significant effect on the absorbed and reflected power in the range of 0.8–2.6 GHz. There was a significant difference above 2.6 GHz frequency for absorbed power ratio. An increase in the density of hybrid yarns in the fabric structure leads to an increase in the electromagnetic shielding effectiveness values. Two-metal placement has a higher absorbed power than the full and one-metal placements, respectively. The samples which have double layers and including metal wire were in their all wefts reached the maximum electromagnetic shielding effectiveness values for stainless steel (78.70 dB), copper (72.69 dB), and silver composite (57.50 dB) fabrics.
Highlights
Electromagnetic (EM) waves are emitted from devices that are used especially for communication and data transfer applications such as mobile phones, wireless networks, and base stations at various frequencies
electromagnetic shielding effectiveness (EMSE), absorption, and reflection of the samples were calculated using equations (1) to (4) using the scattering (S) parameters obtained from the measurements
The results showed that the EMSE values of all samples were lower than 5 dB in the warp direction
Summary
Electromagnetic (EM) waves are emitted from devices that are used especially for communication and data transfer applications such as mobile phones, wireless networks, and base stations at various frequencies. The purpose of EM shielding is to restrict penetration of EM waves in specific areas. When the EM wave encounters an EM shield, it is Department of Textile Engineering, Çukurova University, Adana, Turkey. Attenuated by the three electromagnetic shielding effectiveness (EMSE) components, namely, reflection, absorption, and multiple reflections (generally neglected).[1,2,3] Reflection from a surface of shield material and absorption in a volume of shield material are the two major factors of shielding effectiveness (SE). Metal plates are considered to be the best materials for EM shielding, but they have some disadvantages such as rigid structure, high cost, and dimensional change on heating
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