用FDTD法分析冷等离子体模型左手材料填充对同轴线截止特性的影响  

FDTD method for analyzing the impact of cutoff characteristic of the coaxial line filled with cold plasma model of left-handed material

作　　者：林福明[1] 刘志勇[2] 胡智昕[3] 

机构地区：[1]江西理工大学西校区,江西赣州341000 [2]江西理工大学理学院,江西赣州341000 [3]赣南医学院第一附属医院,江西赣州341000

出　　处：《江西理工大学学报》2013年第5期92-95,共4页Journal of Jiangxi University of Science and Technology

基　　金：江西省教育厅一般基金项目(GJJ12330);江西理工大学校级课题项目(jxxj12076)

摘　　要：左手材料的研究是近年来的科研热点.电磁波在左手材料中的传播特性成为研究的主要方向之一.给出了柱坐标系下冷等离子体模型左手材料改进后的时域有限(FDTD)差分格式.利用得到的FDTD差分格式数值计算了不同厚度、不同折射率冷等离子体模型左手材料分别部分填充同轴线后TE模的归一化截止波数,并与正常材料部分填充进行比较.结果显示:左手材料部分填充同轴线后,其TE模截止波数随填充厚度和折射率绝对值的增大而增大,与正常材料填充的结果正好相反.展示了左手材料具有奇异的电磁特性,为左手材料的研究提供数据基础.In recent years, the left-handed materials are so widely studied in scientific research so that its radio-wave propagational characteristics become an important problem. This paper presents the improvement of difference scheme of FDTD for calculating cold plasma model of left-handed materials in cylindrical coordinate system. The normalized cut-off wavenumber of TE-mode of the coaxial line filled with cold plasma model of left-handed materials with different thickness, different refractive index is calculated by FDTD method, and a result of comparison with the normal material partially filled is given. The result shows： after the cold plasma model of left-handed materials partly filled in the coaxial line, the normalized cut-off wavenumber of TE-mode is increased along with the increasing thickness and refractive index absolute value of left-handed materials, the result of the normal materials filling is in the opposite. The fantastic electromagnetic characteristics of left- handed materials is showed, and provides the data base for studying left-handed materials.

关 键 词：左手材料 FDTD法 同轴线 截止波数 

分 类 号：O451[理学—无线电物理]