面向5G毫米波的绿色多性能电磁屏蔽材料

Green multi-performances electromagnetic shielding material for 5G mm-wave

为解决5G毫米波带来的电磁辐射及现有电磁屏蔽材料造成的环境二次污染、高雷达散射截面、光学不透明和难以共形等问题,本文以超材料吸波体为基础,提出了一个满足绿色屏蔽指数gs≥1的低雷达散射截面、光学透明和柔性多性能电磁屏蔽材料。该电磁屏蔽材料属于人工可设计的多层结构,使用透明导电材料氧化铟锡作为周期性谐振单元结构和底层铺地所用材料,透明材料聚对苯二甲酸乙二醇酯和聚氯乙烯作为介质层。仿真和实验结果一致性表明:该屏蔽材料在22~30 GHz频段内可实现未共形与共形角度60°状态>30 dB的绿色有效电磁屏蔽及>5 dB的雷达散射截面(RCS)缩减。理论推导的等效电路、等效参数和场分布论证了吸收屏蔽的原理。该绿色多性能电磁屏蔽材料精确覆盖了毫米波n257、n258和n261频段,可有效解决这些频段带来的电磁干扰问题。

In order to solve the electromagnetic radiation brought by 5G mm-wave,and environmental secondary pollution,high radar scattering cross section,optical opaque and difficult to conformal caused by the existing electromagnetic shielding materials.A multi-performances electromagnetic shielding material based on a metamaterial absorber was proposed in this paper,which can meet the green shielding index gs≥1 with low radar cross section(RCS),optical transparency,and flexible performances.This electromagnetic shielding material belongs to a manually designable multi-layer structure,in which the transparent conductive material indium tin oxide was used as the periodic resonant unit structure and the underlying floor material.The transparent materials polyethylene terephthalate and polyvinyl chloride were used as the dielectric layer.The consistency between simulation and experimental results shows that in the frequency range of 22-30 GHz,and un-conformal and conformal angle of 45°states,the proposed shielding material can achieve>30 dB green effective electromagnetic shielding and>5 dB RCS reduction.The equivalent circuit of theoretical derivation,and equivalent parameters,field distribution demonstrated the principle of absorption shielding.The green multi-performances electromagnetic shielding material accurately covers the 5G mm-wave n257,n258,and n261 frequency bands,which can effectively solve the electromagnetic interference problem caused by these frequency bands.