利用matlab实现已知电势分布情况下，周围电磁场的分布情况。-achieved using Matlab known potential distribution circumstances surrounding the distribution of the electromagnetic field.

采用fdtd计算二维电磁场，没有边界条件 优点：可以打印输出Ez场分布

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.