讨论了一种广义FDTD算法,它是建立在修正的Maxwell方程式基础上的。引入尺寸的比例因子和尺寸扩展因子使空间网格沿三个轴向的大小既具有不相等,具有可变。(A generalized FDTD algorithm is discussed, which is based on the modified Maxwell equation. The scale factor and size expansion factor are introduced to make the space meshes not equal and variable in the three axial direction.)