Liu Zhe, Duan Jin, Wang Xiuchen
School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an 710048, China.
Key Laboratory of Functional Textile Material and Product, Xi'an Polytechnic University, Ministry of Education, Xi'an 710048, China.
Polymers (Basel). 2023 Mar 9;15(6):1366. doi: 10.3390/polym15061366.
The electromagnetic shielding (EMS) fabric is an important electromagnetic protection product, which is widely applied in various fields. The improvement of its shielding effectiveness (SE) has always been the focus of research. This article proposes to implant a metamaterial structure of a "split-ring resonator (SRR)" in the EMS fabrics, so that the fabric not only maintains the porous and lightweight characteristics, but also obtains the SE improvement. With the help of the invisible embroidery technology, stainless-steel filaments were used to implant hexagonal SRRs inside the fabric. The effectiveness and influencing factors of the SRR implantation were described by testing the SE of the fabric and analyzing the experimental results. It was concluded that the SRR implantation inside the fabric can effectively improve the SE of the fabric. For the stainless-steel EMS fabric, the increase amplitude of the SE reached between 6 dB and 15 dB in most frequency bands. The overall SE of the fabric showed a decrease trend with the reduction of the outer diameter of the SRR. The decrease trend was sometimes fast and sometimes slow. The decreasing amplitudes were different in various frequency ranges. The number of embroidery threads had a certain effect on the SE of the fabric. When other parameters remained unchanged, the increase of the diameter of the embroidery thread resulted in the increase of the SE of the fabric. However, the overall improvement was not significant. Finally, this article also points out that other influencing factors of the SRR need to be explored, and the failure phenomenon may occur under certain situations. The proposed method has the advantages of the simple process, convenient design, no pore formation, SE improvement retaining the original porous characteristics of the fabric. This paper provides a new idea for the design, production, and development of new EMS fabrics.
电磁屏蔽（EMS）织物是一种重要的电磁防护产品，广泛应用于各个领域。提高其屏蔽效能（SE）一直是研究的重点。本文提出在EMS织物中植入“分裂环谐振器（SRR）”的超材料结构，使织物不仅保持多孔和轻质的特性，还能提高SE。借助隐形刺绣技术，使用不锈钢细丝在织物内部植入六边形SRR。通过测试织物的SE并分析实验结果，描述了SRR植入的有效性和影响因素。得出结论：在织物内部植入SRR可以有效提高织物的SE。对于不锈钢EMS织物，在大多数频段，SE的增加幅度达到6 dB至15 dB。织物的整体SE随着SRR外径的减小呈下降趋势。下降趋势有时快有时慢。在不同频率范围内下降幅度不同。绣花线的数量对织物的SE有一定影响。当其他参数不变时，绣花线直径的增加导致织物SE的增加。然而，整体改善并不显著。最后，本文还指出需要探索SRR的其他影响因素，并且在某些情况下可能会出现失效现象。所提出的方法具有工艺简单、设计方便、不形成孔隙、在提高SE的同时保留织物原有多孔特性等优点。本文为新型EMS织物的设计、生产和开发提供了新思路。
