有耗异向介质层覆盖普通介质圆柱电磁特性的研究

研究了线电流源平行放置在有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.首先，提出电磁模型并给出此电磁模型的精确解.其次，利用精确解进行数值计算，得到不同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.由于有耗异向介质的负折射特性和损耗的同时作用，相比于无耗异向介质层以及有耗普通介质层，得到了有耗异向介质层覆盖普通介质圆柱模型在近场和远场特性上极为不同的电磁特性.关键词：线电流源异向介质方向性系数辐射阻抗

Investigation on the electromagnetic characteristics of lossy metamaterial covered dielectric cylinder

The electromagnetic characteristics of the model with an electric line source radiating in the direction parallel to a lossy metamaterial covered infinitely long dielectric circular cylinder have been investigated. Firstly, the electromagnetic model is presented and the exact solution is derived. Secondly, this exact solution is employed in numerical calculations. The patterns of the near field under different electromagnetic parameters are obtained. The characteristics of the far field properties are also studied through the directivity and the normalized radiation resistance. Due to the effect of the negative refraction and the loss of the lossy metamaterial, in comparing the lossless metamaterial layer and the lossy conventional material layer, very different electromagnetic characteristics on the near and the far field of the lossy metamaterial covered dielectric cylinder are revealed.