含石墨烯三明治结构杂化超表面微波吸收性能调控研究

Research on the Control of Microwave Absorption Properties of Hybrid Meta-Surface Containing Graphene Sandwich Structure

基于石墨烯的电磁可调性与具有特殊电磁响应的无源金属结构耦合,设计了三明治结构微波吸波超表面,系统地研究了金属结构和石墨烯电性对吸波性能的调控。通过三维全波电磁场仿真,证实了可以通过调节石墨烯方阻改变谐振频率处的吸波率,于740Ω/sq实现微波的完美吸收,且由担任相移介质的聚丙烯的厚度控制谐振频率。构建了石墨烯结构与金属微结构杂化超表面,对引入金属谐振模式进一步增强微波吸收的超表面设计进行了研究,证实了可以通过调节石墨烯方阻获得频率23.2GHz和36.4GHz处的微波完美,以及由其确定的宽带吸收。分析了金属线宽、周期、金属石墨烯间距等主要结构参数对吸波率与频率的影响。该研究在拓展超表面设计与石墨烯应用方面有着一定的价值。

A hybrid meta-surface for achieving microwave absorption is designed based on the tunability of graphene and passive metallic structure with specific response to utilize the metallic structure and the electric properties of graphene for controlling the wave absorption.Through simulating three-dimensional fullwave electromagnetic field,the results prove the simulation to be the fact that the absorption rate at the resonant frequency can be tuned by adding the bias voltage through the square resistance of graphene,a perfect-absorption is achieved at a resistance level of 740Ω/sq,and the absorption frequency is determined by the polypropylene thickness.The hybrid meta-surface combined with metallic structure and microwave absorber is further constructed,the metallic structure with new resonant mode is designed to increase the operation band width of the microwave absorption.The perfect absorption can achieve at 23.2 and 36.4 GHz,and the these two frequencies define a wide band microwave absorption.The influence of structural parameters on the absorptive rate and frequency is studied.The research on the tunable absorption in hybrid meta-surface is of certain scientific value in meta-surface design and graphene related applications.