一种新的FDTD差分网格

A New Difference Grid of FDTD

提出了一种新的时域有限差分法(FDTD)差分网格,使电场各分量位于网格的顶点,磁场各分量位于网格的中心.导出了基于新网格的FDTD迭代公式,讨论了新网格对FDTD基本理论的影响.新网格的优点在于:更新某一分量时,用到了其周围更多的信息,使计算精度得到提高.数值实验证明新网格对提高计算精度是有效的.

A new difference grid of the finite-difference time-domain method（FDTD） is put forward; and the electric components are in the vertex of the grid; the magnetic components are in the center. The iterative equations of FDTD based on the new grid are derived; and the effect of the new grid on the fundamental theory of FDTD is discussed. The advantage of the new grid is that more information around is used when one component is refreshed; and so the computational accuracy is raised. The numerical experiments indicate that the new grid can raise the computational accuracy effectively.