基于电阻膜结构的宽带柔性透明超材料吸波器

Broadband Flexible Transparent Metamaterial Absorber Based on Resistive Film Structure

研制了一种基于电阻型表面电材料氧化铟锡(ITO)的柔性透明电磁超材料吸波器,中间介质层选用聚对苯二甲酸乙二醇酯(PET)和聚甲基丙烯酸甲酯(PMMA)组合而成,谐振结构和底层反射板由ITO构成。设计的超材料吸波器的吸波率峰值可达0.999,吸波率约为0.9时的频段能够完全覆盖Ku到U波段,相对带宽为136%。同时超材料吸波器会表现出极化不敏感性以及宽角度入射的吸收特性。结合软件仿真与实验结果,利用电场分布图、谐振层结构特性和叠加结构吸收特性对吸收机理进行了分析,表明电阻膜的稳定阻抗实现了电磁波能量的强欧姆损耗,其中上、下层电阻膜结构分别作用在高频段和低频段,二者相互叠加实现了高效的宽频吸收性能。该吸波器在高温环境透明射频器件领域和常规电磁防护方面有潜在应用价值。

A flexible transparent electromagnetic metamaterial absorber based on resistive surface electric material indium tin oxide(ITO)was developed.The intermediate dielectric layer is composed of polyethylene terephthalate(PET)and polymethyl methacrylate(PMMA),and the resonant structure and the bottom reflector plate are composed of ITO.The peak absorption of the designed metamaterial absorber can reach 0.999,the frequency band for the absorption of about 0.9 can completely cover Ku to U band,and a relative bandwidth is 136%.At the same time,the metamaterial absorber shows polarization insensitivity and wide angle incidence absorption characteristics.Combining software simulation and experimental results,the absorption mechanism was analyzed by using electric field distribution diagrams,resonant layer structure characteristics and superimposed structure absorption characteristics,showing that the stable impedance of resistive film achieves strong Ohmic loss of electromagnetic wave energy,in which the upper and lower resistive film structures act in high and low frequency bands,respectively,and superposition of the upper and lower resistive film structures achieves efficient broadband absorption performance.The absorber has potential application value in the field of transparent radio frequency(RF)devices in high temperature environment and conventional electromagnetic protection.