FDTD法模拟无源区域二维TE波的传播(Mur二阶吸收边界条件) 光速 空间步长 空间网格数 源的位置 一阶边界条件中的系数 角点的系数 克服激励源引起的虚拟反射赋软源-FDTD simulation of passive area of two-dimensional TE wave propagation ( Mur two order absorbing boundary conditions ) light space step spatial grid number source location boundary conditions in the corner of the coefficient coefficient of overcoming excitation source induced by virtual reflection Fu software source