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Role of coating add-on and substrate material on microwave and EMI shielding properties of coated fabric

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Title Role of coating add-on and substrate material on microwave and EMI shielding properties of coated fabric
 
Creator Gupta, Krishna Kumar
Dhyani, Ganga Datt
Yadav, Rakesh Kumar
Goswami, Thako Hari
 
Subject Conducting fabric
Coated fabric
Cotton fabric
EMI shielding effectiveness
Microwave properties
Scattering parameters
 
Description 362-374
Role of coating add-on and nature of textile substrate have been studied on microwave and EMI shielding properties of
coated cotton fabric. Coated fabric samples have been prepared with coating formulations containing carbon black and
milled carbon fibre in polyurethane matrix, using cotton (non-conducting) and conducting fabric (warp: SS20%/PET80%,
weft: SS 55% / PET 45% ) substrate simultaneously. A high precision lab coating machine (Mathis Lab Coater, UK) has
been used to produce coated fabric of uniform thickness (0.31- 0.67 mm). Coated fabrics are studied for microwave and
EMI shielding properties in 8.2-18.0 GHz (X & Ku) frequency band in vertical and horizontal polarisation of
electromagnetic wave. The microwave properties of coated fabric based on cotton substrate are found due to coating add-on
only, as the cotton itself does not have any role to play. Cotton - based coated fabric with add-on of 257.7% exhibits 32-43%
reflection, 22-39% transmission, 37-42% absorption and EMI shielding of 5.23-7.93 dB in 8.2- 18.0 GHz. On the other
hand, microwave properties of coated fabric prepared on conducting substrates are found to produce synergetic effect of
substrate material and coating add-on. Coated fabric on conducting substrate with add-on of 185.5% displays 92-82%
reflection, 0.17-0.36% transmission, 7.20 - 26.310% absorption and EMI shielding of 23.98- 21.64 dB. Apart from this,
coated fabrics are also prepared with gradual increase of coating add-on in order to understand the effect of ultimate coating
add-on loading and to obtain optimum threshold combined effect of coating add-on and substrate materials. Sample with
coating add-on of 237.9% acquires high surface conductivity (σ = 46.34 S/m) and low surface resistivity (34.25 Ω/□).
Coated fabric offers 93.47-79.47% reflection, 6.39-22.07% absorption,
 
Date 2022-09-05T08:50:42Z
2022-09-05T08:50:42Z
2022-09
 
Type Article
 
Identifier 0971-0426 (Print); 0975-1025 (Online)
http://nopr.niscpr.res.in/handle/123456789/60469
https://doi.org/10.56042/ijftr.v47i3.52329
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJFTR Vol.47(3) [Sep 2022]