The simplified model of the missile is built using conducting cylinder. The high frequency-Geometrical Theory of Diffraction ( GTD) is used to analyze and calculate the pattern of monopole antenna, Huygens antenna, micro-strip-spiral antenna and horn antenna loading with dielectric. 用金属导电圆柱体建立了导弹的简化模型,利用几何绕射理论(GTD)分别分析计算了弹载单极子天线、惠更斯元面天线,微带螺旋天线和介质环加载圆锥喇叭天线的辐射方向图。