介质覆盖导电圆柱上缝隙天线高频辐射UTD研究

研究介质覆盖导电圆柱面上缝隙天线三维空间电磁辐射高频近似理论．应用并矢格林函数与高频近似相结合的方法，导出了源与辐射场之间的并矢变换函数，得到了类Ｆｏｃｋ函数的广义复合型Ｆｏｃｋ函数，给出了介质覆盖导电圆柱面上缝隙天线远区辐射场高频近似一致性几何绕射理论（ＵＴＤ）公式．用所得公式及其推广的结果计算了圆柱、圆锥等曲面上缝隙天线部分方向图．结果表明，高频近似ＵＴＤ解与严格解和实验吻合很好．为这类问题的工程设计、计算和分析提供了一个有效方法．

AN UNIFORM GTD SOLUTION OF RADIATION FIELD FORM SLOT ON A DIELECTRIC-COATED CONDUCTING CYLINDER

A high frequency approximate method for the field radiated by a slot on a dielectric-coated perfectly conducting circular cylinder is investigated in this paper. An uniform GTD solution is obtained in terms of dyadic Green's function method and high frequency approximate techniquence. The solution is expressed by the compound Fock function,which represents the creeping wave field in the deep shadow region. It can be reduced to the geometrical optics field in the lit region and remains uniformly crossing the transition region.The radiation patterns of slots on a dielectric-caated conducting and cone cylinder using UTD solution are compared with those of exact solution'and with measured ones, and excellent is obtained.