基于石墨烯的电控可调微波吸收器件  

Graphene-based electronically controlled tunable microwaveabsorbing device

作　　者：张恒[1,2,3] 龚俊儒 胡承刚 李朝龙 史浩飞[1,2,3] ZHANG Heng;GONG Junru;HU Chenggang;LI Chaolong;SHI Haofei(Key Laboratory of Multi-Scale Manufacturing Technology,Chongqing 400714,China;Chongqing Institute of Green and Intelligent Technology,Chongqing 400714,China;University of Chinese Academy of Sciences,Beijing 100049,China;Southwest Electronic and Telecommunication Technology Research Institure,Chengdu 610000,China)

机构地区：[1]中国科学院重庆绿色智能技术研究院,重庆400714 [2]跨尺度制造技术重庆市重点实验室,重庆400714 [3]中国科学院大学,北京100049 [4]西南电子电信技术研究所,成都610000

出　　处：《电子元件与材料》2019年第6期90-95,110,共7页Electronic Components And Materials

基　　金：国家自然科学基金项目(61601434)

摘　　要：电控可调微波吸收器件在微波工程领域有着广泛的应用前景。本文采用石墨烯/离子液体/石墨烯的三明治夹层结构代替传统Salisbury屏的电阻层,利用石墨烯表面电荷浓度可调的性质,通过外加电压对三明治结构的输入阻抗动态调控,进而实现对微波吸收的动态调控。通过数值仿真研究了反射率随方块电阻的变化特性,并测试了不同电压下的反射率变化规律。结果表明,电压从0V变化到2V过程中,电压为0.6V时,反射率最小为-42.09dB,阻抗匹配程度最佳。最后,建立了该模型的等效电路,理论计算了谐振频率处反射率与方块电阻之间的关系,揭示了影响调控性能的因素。Electronically tunable microwave absorbing devices have broad application prospects in the field of microwave engineering. The sandwich structure of graphene/ionic liquid/graphene was used to construct an active Salisbury absorber. The regulation of microwave absorption were realized through applying bias-voltage on the sandwich structure. The variation of reflection with the sheet resistance and voltages were studied by numerical simulation. When the voltage varied from 0 V to 2 V, the reflection reached the minimum -42. 09 dB at 0. 6 V. Finally, the equivalent circuit of the model was established, and the factors of the regulation performance were revealed through theoretical analysis of the relationship between reflection and sheet resistance.

关 键 词：石墨烯 微波 Salisbury屏 阻抗匹配 

分 类 号：O441.4[理学—电磁学]