介质覆盖导电凸曲面上天线高频近似光区辐射场研究

LIT REGION RADIATION FIELD FROM AN ANTENNA ON A CONDUCTING SMOOTH CONVEX SURFACE WITH A DIELECTRIC COATINGS

在高频大电尺寸条件下,辐射场的局域原理成立。介质覆盖导电平板面上天线的的辐射是大电尺寸高频条件下介质覆盖导电凸曲面上天线光区辐射场一个很好的近似。文中首先利用并矢格林函数方法求出了介质覆盖平板面上振子天线辐射场的严格解,并在此基础上,引用几何光学射线坐标系导出了介质覆盖导电凸曲面体面上振子天线远区辐射几何光学场。数值结果表明,这一结果确是介质覆盖导电凸曲面体面上天线辐射高频近似光区辐射场。

When the dimensions of a conducting smooth convex surface body with a dielectric coatings are very large compared to the wavelength, the high fre- quency ray field in the lit region radiated by an antenna on a perfectly conducting smooth convex surface coated with a dielectric layer can be expressed by the radiating field from an antenna on prefectly conducting plane coated with a dielectric layer. The radiating field from electric or a magnetric dipole on a prefectly conducting plane coated with a dielectric layer is obtained by dyadic Green's function (DGF) method at first. Then the lit region radiation field from an antenna on a perfectly conducting smooth convex sur face with a dielectric-coated is derived by introducing ray coordinates. The numerical results calculated from the solution agree very well with that calculated from exact solution.