基于石墨烯的隔离器理论设计与分析  

Design and analysis of graphene-based isolator

作　　者：肖丙刚[1] 谢治毅[1] 孙润亮[1] 

机构地区：[1]中国计量学院信息工程学院,浙江杭州310018

出　　处：《浙江大学学报（工学版）》2015年第1期42-46,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(61107042)

摘　　要：基于石墨烯,理论设计与分析了应用于3G通信领域的新型隔离器.隔离器由2个线栅偏振器和1个旋转器组成,旋转器由硅/二氧化硅薄膜、多层石墨烯和二氧化硅基板叠加而成.由于石墨烯在磁场偏置下具有法拉第效应和非互异性,当平面波从正、反两个方向入射隔离器时,电场沿入射方向发生±30°的偏转,使得正向传输的平面波几乎无损通过,而反向传输的平面波被全反射,实现了隔离.利用传输矩阵法计算了隔离度,结果表明,设计的隔离器在工作频段1.8-2.2GHz内具有良好的隔离特性,隔离度均在12dB以上,且插入损耗均小于-1.63dB.A novel isolator which was applied in the 3rd generation telecommunication was theoretically designed and analyzed based on graphene.The proposed isolator is composed of two wire grid polarizers and one Faraday rotator.The Faraday rotator is composed of Si/SiO2 thin films,multilayer graphenes and quartz substrate.Because the graphene in bias magnetic field has gyrotropy and non-reciprocity properties,when the plane wave is propagating in both directions of the isolator,the electric field of the plane wave will be inclined±30°.Thus the forward transmitted plane wave will pass through the isolator with almost identical,but the backward transmitted plane wave will be totally reflected.The isolation was calculated by using the transmission matrix method.Results indicate that the isolator is in good isolation performance with the isolation above 12 dB and the insertion loss lower than-1.63 dB in the working frequency range from 1.8to 2.2GHz.

关 键 词：隔离器 石墨烯 法拉第旋转器 3G移动通信 

分 类 号：TN61[电子电信—电路与系统]