无耗异向介质层覆盖介质圆柱电磁特性的研究  

Electromagnetic characteristics of dielectric cylinder covered lossless negative refraction metamaterial

作　　者：王海龙[1] 吴群[1] 吴健 孟繁义[1] 李乐伟[1] 

机构地区：[1]哈尔滨工业大学电子与信息技术研究院,黑龙江哈尔滨150001 [2]电波环境特性重点实验室,北京102206

出　　处：《电波科学学报》2007年第6期906-912,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(60571026);电波环境特性及模化技术国家重点实验室项目(514860303HT0101)

摘　　要：研究了线电流源平行放置在无耗异向介质层覆盖的无限长介质圆柱附近模型的电磁特性。提出这个电磁模型,求得此电磁模型的精确解。利用精确解进行数值计算,得到在不同几何参数和电磁参数情况下该电磁模型的近场分布图形,并通过方向性系数和归一化辐射阻抗研究其远场特性。由于异向介质的负折射特性,如果发生完全聚焦,在异向介质层和普通介质圆柱的近场图形内得到两个明显的"焦点"区域,否则不存在焦点区域;普通介质层覆盖时不存在这种现象。最后,将电磁模型同前人方法进行了比较,验证了本电磁模型的有效性。The electromagnetic characteristics of infinitely long dielectric circular cylinder covered a lossless metamaterial near with a parallel electric line source is investigated in this paper. Firstly, the electromagnetic model is presented and exact solution was derived out. Secondly, the exact solution is employed in numerical calculations. The figures of the near field for different geometric and electromagnetic parameters are obtained, and the characteristics of the far field properties are studied through the directivity and normalized radiation resistance. For the negative refraction of the metamaterial, if the full focusing occurs, there will be two distinct ＂focus＂ areas in the metamaterial layer and the conventional dielectric cylinder, and for conventional material layer, the phenomenon could not be seen. Finally, the validity of the presented electromagnetic model is proven by comparing with other approachs.

关 键 词：线电流源 异向介质 方向性系数 辐射阻抗 

分 类 号：TM15[电气工程—电工理论与新技术]