## 4 Conclusions  
Different types of woven fabrics were coated using electrically conductive composition containing PEDOT:PSS. All samples developed for this study were characterized by surface resistivity and microwave properties within the 2-18 GHz frequency range. To improve the wear and washing resistance performance of the developed samples, conventional textile surface modification technique--atmospheric plasma treatment, was used. Reflection and transmission measurements showed that for tested samples the combined effect of reflection and absorption determines the shielding properties, but the role of these two parameters is different over the tested frequency range. Shielding properties of investigated coated fabrics, with plasma treatment as well as without it, are steady in all tested frequency range and are sufficiently good for shielding/radar absorbing materials: SE for samples of groups I, II, and III is about 15-19 dB and for group IV 17-20 dB. There was no significant increase in SE due to plasma treatment, maybe except for samples of I group (wood fabric), where after the plasma treatment SE increased from 15 dB to 19 dB. This can be explained by the higher deposit of conductive paste on the fabric due to significant improvement in the hydrophilicity by plasma. Meanwhile, reflection and consequently absorption are frequency-dependent. For all tested samples, the better absorption ability was obtained in the 12-18 GHz range. Moreover, it was noticed the positive effect of plasma treatment on absorption properties, particularly for samples of II (PA fabric) and III (PA/cotton) groups. The best results were obtained for II group's samples (PA fabric): the contribution of absorption to shielding at 18 GHz was 52% for sample without plasma treatment and increased to 74% after plasma treatment. It was found that EMR shielding effectiveness (SE) as well as absorption properties depend not only the amount of conductive paste topped on the fabric, but also resides in the construction parameters of fabrics and their finishing before coating. Depending on such fabric structural parameters as-density, mass per unit area, type of weave, layer of shield (or coating) just sticks on the fabric surface or penetrates into fabric changing the shield thickness herewith turning SE results. Meanwhile, the fiber composition of fabrics influences mostly bonding between fibers and polymer coating. The investigations have shown that applied plasma treatment visibly improved abrasion resistance as a result of better adhesion between textile substrate and coating. The most effectively plasma influenced abrasion resistance of wool (I group) and PA/cotton (III group) fabrics. SE measurement results before and after washing procedures showed that plasma treatment somewhat improved washing resistance of conductive coat. Comparing the shielding effectiveness of washed coated fabrics without and with plasma treatment, it was determined that for all tested fabrics with plasma treatment SE decreases less liken to untreated fabrics: for group I (wood fabrics) SE decreases 3.8 times for the plasma treated sample and 7.5 times for untreated and for other groups respectively, for group II (PA fabrics) 2.8 and 7.2 times; for group III (PA/cotton fabrics) 2.5 and four times; for group IV (aramid/viscose fabrics) 5.6 and eight times. However, washing resistance increased not so considerably as the binding strength of the coating was insufficient for such impact. A more significant improvement of resistance to washing of such coated fabrics will be the subject of our subsequent study. Conceptualization, A.A., V.R., and J.B.-G.; methodology, V.R., J.B.-G., and P.R. ; investigation, V.R., J.B.-G., P.R., A.S., J.P., and G.S. writing--original draft preparation, V.R. and J.B.-G.; writing--review and editing, V.R. and J.B.-G.; supervision, A.A. All authors have read and agreed to the published version of the manuscript.