介质覆盖导电圆柱体表面高频感应电流的解析公式  

Explict Expressions for the Surface Currents Induced on a Dielectric-coated Conducting Cylinder

作　　者：吴祥应[1] 刘刚[1] 

机构地区：[1]上海科学技术大学

出　　处：《电波科学学报》1993年第3期11-17,共7页Chinese Journal of Radio Science

摘　　要：利用 Watson 变换,我们导出了平面波入射下介质覆盖理想导电圆柱体表面高频感应电流的解析表达式。分析表明,导体表面高频感应电流由两部分构成,一部分是电磁波直接照射下感应的物理光学电流 J_o,另一部分是由曲面绕射产生的表面爬行电流 J_c,该爬行电流的传播系数和衰减常数只与内导体半径和覆盖介质层的材料有关。当去掉介质覆盖时,由我们的新公式可以得到和已有文献相同的结果。Explict expressions for the surface currents induced on a dielectric—coated conducting cylinder by an incident plane wave are derived.The results are of such forms that they can be applied directly in numerical computations and be used to understand the mechansim of the induced surface current.It is shown that the total surface current can be represented as the sum of two components,the physical optics current J_o and the creeping current J_c created by the surface diffraction on which the transfer coefficients as well as the attenuation constants are dependent only on the radius of the inner conducting cylinder and on the dielectric coatings.

关 键 词：散射 介质 覆盖 导体 电磁波 

分 类 号：TN011[电子电信—物理电子学]