摘要
总场-散射场源是时域有限差分法(FDTD)最常用的激励源,但受时域有限差分法电场和磁场数值采样既不同位又不同时的影响,不可避免地会有入射波泄漏到散射场区,从而对计算结果造成影响。文中提出一种减少总场-散射场源电磁泄漏的方法,其基本原理是:在总场区和散射场区的连接界面附近,使用亚网格进行仿真,而在其它区域,使用主网格进行仿真。使用亚网格仿真时,空间步长和时间步长均明显小于使用主网格仿真时的空间步长和时间步长,从而可以明显减小在加入激励源时电场和磁场数值采样既不同位又不同时的影响,大幅度地改善计算结果。编程进行了数值实验,实验结果表明新方法在减少总场-散射场源电磁泄漏方面效果明显。
The total field / scattered field technology（ TF / SF） is the most popular source technology of the finite difference time domain method（ FDTD）,but the technology induces electrical leakage of the incident wave into the scattered field region,since that the numerical sampling of the electrical field of the FDTD method is neither at the same position nor at the same time,thus effect the computational results. A new method to reduce electrical leakage of the TF / SF technology is brought forward,and the fundamental principle of the method is as follow： the subgrids is used to simulation nearby the joint interface of the total field region and the scattered field region,and the main grids are still used in the other regions. The space step size and the time step size of the subgrid are both less than the corresponding step size of the main grid,thus the method can reduce the effect of the problem of numerical sampling and improve the computational results. The numerical experiments were done,and the experiment results indicate that the new method can effectively reduce electrical leakage of the TF / SF technology.
出处
《信息技术》
2015年第4期48-50,共3页
Information Technology
基金
中央高校基本科研业务项目(26120102010B23414)
