用平面波展开法计算二维声子晶体带隙，里面附有注释，可以学习-With two-dimensional plane wave expansion method to calculate the phononic band gap, which is annotated, you can learn

计算天线辐射和电磁场的空间分布，可以得到天线的赤道面和子午面的方向图。-Calculate the antenna radiation and electromagnetic field spatial distribution of the antenna can be the equatorial plane and the meridional plane patterns.

基于MATLAB的光学仿真，平面波与球面波干涉，平面波与平面波，球面波与球面波(the interference of the plane wave and the spherical wave)