由于测量天线的辐射方向图需要相当昂贵的仪器，而通过仿真可以获得所设计天线的辐射方向图，能够很好的辅助天线设计。 本程序仿真了对称偶极子天线。-As the measurement antenna radiation pattern need very expensive equipment, and simulation can be designed through the antenna radiation pattern can be a good auxiliary antenna