新型可调铁氧体-金属丝棋盘结构左手介质  

Novel tunable ferrite-wire chessboard structure left-handed metamaterial

作　　者：胡振燕[1] 朱柏承[1] 周乐柱[1] 

机构地区：[1]北京大学信息科学技术学院,北京100871

出　　处：《电波科学学报》2009年第5期799-803,825,共6页Chinese Journal of Radio Science

摘　　要：提出一种新型的铁氧体-金属丝组合构成的左手介质结构,该结构由金属丝单元和铁氧体单元类似棋盘式地交错周期排列。应用基于矢量基和标量基的混合有限元法(FEM)及矢量Floquet定理的数值分析方法对其传输特性进行了数值计算和模拟,结果表明:在单负特性的金属线栅结构(εeff<0)和铁氧体结构(μeff<0)都不能透过的区域,双负特性的铁氧体-金属丝棋盘结构表现出带通特性,证实了该棋盘结构的左手特性。理论分析进一步证明了该结构的通带可以通过外加偏置磁场的变化来进行调节。This paper proposes a novel ferrite-wire composite left-handed metamaterial （LHM） structure, in which wire and ferrite elements are alternately placed, similar to a chessboard. Transmission property of the structure is calculated by the numerical simulation method based on FEM of the hybrid of edge-elements and node-elements incorporated with vector Floquet＇s theorem. The simulation results shows this novel chessboard structure exist transmission property at the frequency band where wire permittivity εeff and ferrite permeability ueff are both in negative, while the incident wave cannot be single wire-grid structure （ueff〈0） the novel ferrite-wire chessboard band property of the ferrite-wire transmitted in single ferrite structure （εeff〈0） or single wire-grid structure （εeff〈0）. It confirms the left-handed characteristics of the novel ferrite-wire chessboard structure. Simulation results also show the pass- band property of the ferrite-wire chessboard LHM can be adjusted by changing the applied bias magnetic field.

关 键 词：左手介质(LHM) 异向介质 铁氧体 有限元(FEM) 周期结构 棋盘结构 

分 类 号：TM277[一般工业技术—材料科学与工程]