中文说明：
天线理论画图使用Matlab画图，更好的理解天线的传播效果图，更好的理解天线主瓣和旁瓣的关系和大小。
English Description：
Antenna theory drawing using MATLAB drawing, better understanding of the propagation effect of the antenna, better understanding of the relationship and size of the antenna main lobe and side lobe.