水平电偶极子在负折射媒质半空间激励的场  

Electromagnetic field generated by a horizontal electric dipole on double negative medium half space

作　　者：朱秀芹[1,2] 潘威炎[2] 官伯然[3] 

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071 [2]中国电波传播研究所青岛研发中心,山东青岛266071 [3]杭州电子科技大学天线和微波技术研究所,浙江杭州310018

出　　处：《电波科学学报》2009年第1期71-76,共6页Chinese Journal of Radio Science

摘　　要：讨论了水平电偶极子在由介电常数和磁导率都为负数的媒质和普通媒质构成的均匀半空间中激励的电磁场,并得出了远区场的解析表达式。理论分析和数值计算结果表明:位于普通介质中的水平电偶极子在普通媒质和负折射媒质分界面能够有效激励表面波。该表面波是一种"慢波",沿分界面传播的波数小于波在两种均匀媒质中传播的波数。当两种介质均无损耗时,沿径向传播的幅度按波的几何扩散衰减。由于存在三种传播波数,表面波、侧面波、直达波和反射波共同作用形成的总场将发生复杂的干涉现象。The electromagnetic field produced by a horizontal electric dipole over a double negative（NDG） medium half space is discussed, and the analytical expressions of the field which are convenient for calculation are derived. Based on the formulae and the calculation results, it can be concluded that the dipole on the configuration composed of the common medium and the DNG medium half space can excited the surface wave. The propagating wave-number of the surface wave is less than that in both the two medium, so that this kind of surface wave is a kind of slow wave. Considered both the medium are lossless, the amplitude of the surface wave decrease with the radial distance as geometry divergence. The total field appears the complex interference because of the superposition of three kinds of wave modes.

关 键 词：负折射媒质 水平电偶极子 表面波 侧面波 

分 类 号：TN011[电子电信—物理电子学]