线电流源激励下无耗异向介质层覆盖导体圆柱电磁特性的研究  

Investigation of a lossless metamaterial covered conductor cylinder illuminated by electric-line-source

作　　者：王海龙[1] 吴群[1] 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,哈尔滨150001

出　　处：《物理学报》2007年第5期2608-2615,共8页Acta Physica Sinica

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

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导体圆柱附近模型的电磁特性.首先,给出了电磁模型描述,求出此电磁模型的精确解.其次,利用精确解进行数值计算,得到几何参数和电磁参数不同情况下电磁模型的近场图形,并通过方向性系数和归一化辐射阻抗研究其远场特性.利用异向介质的负折射特性,在异向介质层的近场图形内得到明显的“焦点”,这个焦点在普通介质层中是不存在的.该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 the model for an electric line source radiating parallel to a lossless metamaterial covered infinitely long conductor circular cylinder is investigated. First, the electromagnetic model is presented and exact solution is derived. Second, the exact solution is employed in numerical calculations. The figures of the near field under different geometric and electromagnetic parameters are obtained; the characteristics of the far field properties are also studied through the directivity and normalized radiation resistance. Because of the negative refraction of the metamaterial, the distinct ＂focus＂, which could not be seen in the conventional material, could be obtained in the material layer from the near field pattern. The presented electromagnetic model is compared with the former approach and its validity is proven.

关 键 词：线电流源 异向介质 方向性系数 辐射阻抗 

分 类 号：O441.6[理学—电磁学]