一种结构简单的二维左手材料设计及仿真研究

Design and simulation of a simple two-dimensional left-handed metamaterials

基于产生负介电常数的周期性金属线单元结构,讨论了金属线长度和宽度的变化对负介电常数的影响.在入射波的波矢k方向上放置两个单元结构,使两单元中的金属线响应入射波的磁场产生负磁导率,就可得到一维左手材料.若保持电边界条件的位置不变而调换波端口和磁边界条件位置,即入射波的波矢k转过90°角,两单元结构同样具有左手特性,从而可实现二维左手材料.

Negative permittivity can be realized from the periodic unit cells of the metallic bar structure,and the effects of the length and the width of the metallic bar on negative permittivity is discussed.Through arraying two unit cells along the direction of the wave vector k,the negative permeability can be achieved from a strong resonance response of the two metallic bars to external magnetic field,so a one-dimensional left-handed metamaterials is obtained.The left-handed properties can also be obtained if magnetic boundary conditions of the two unit cells are interchanged with those of wave ports,but electrical boundary conditions are unchanged,i.e.,the wave vector k rotates by 90°.So a two-dimensional left-handed metamaterials is achieved.