无条件稳定的交替方向隐式FDTD算法

介绍了一种新的FDTD算法-交替方向隐式时域有限差分法（ADI-FDTD），该方法采用求解微分方程的交替方向隐格式改造了FTD算法，使其能无条件稳定，从而极大地节约计算时间，成为一种计算时域电磁场分布的高效算法，同时，首次尝试利用ADI-FDTD方法结合时域近远场变换技术计算天线方向图，数值实验的结果和传统FDTD方法及理论值进行了对比，数值结果一致性较好，并节约了运算所占用的资源，提高了计算效率。

Numerical simulation of unconditionally stable ADI-FDTD algorithm

ADI-FDTD, a new modified version of finite-difference time-domain (FDTD) method, can eliminate the restraint of Courant-Friedrich-Levy condition, so as to get an efficient saving of CPU time. In this paper, it is the first time that this method is applied to the calculation of time-domain near zone to far zone transformation. As simulation examples, two antenna radiation patterns are derived and the numerical results are compared with those obtained from traditional FDTD and theoretical values. Good agreement is observed, while computational efficiency of ADI-FDTD method is improved.