实现平面电磁波入射到2D无限长圆柱导体的电磁仿真，FDTD算法实现。-A plane wave incident on an infinitely long cylindrical conductor electromagnetic simulation, FDTD algorithm.

此程序采用FDTD方法编写，可以用来观察和验证电磁波的绕射-This program is written using the FDTD method can be used to observe and verify the electromagnetic wave diffraction