FDTD算法模拟二维TE波的传输问题，代码很简洁美观，试用于初学者-Transmission problems FDTD method simulation of 2D TE waves, the code is very simple and beautiful, the trial for beginners

二维电磁波在自由空间的传播，边界条件为Mur吸收边界(2D FDTD solution for Mur's Absorbing Boundary Condition Simple harmonic excitation source)