网格长度对FDTD计算的影响  

Effects of Gridding Length on FDTD Calculation

作　　者：李军[1] 武振波[1] 武哲[1] 

机构地区：[1]北京航空航天大学,北京100083

出　　处：《微波学报》2003年第3期18-21,共4页Journal of Microwaves

摘　　要：基于平面波传播的物理性质 ,提出一种FDTD改进方法———在研究稳态问题时 ,为保证数字波前与入射方向垂直 ,网格划分不能是固定的 ,其长度之比应随入射方向变化。研究了改进方法对数值色散的影响 ,并与传统方法作了比较。在三维Yee网格中对平面波的模拟结果表明 ,改进方法的收敛性能大为提高 。An improved FDTD method is presented in the paper based on the physics characteristic of plane wave propagation. Spatial increments can not be fixed and should vary with the change of the angle of incidence, which can ensure that numerical wave front is perpendicular to the direction of incidence. The effects of the improved method on numerical dispersion are studied and comparisons are made to the conventional FDTD method. The simulation results of plane wave in three-dimensional Yee mesh show the convergence performance is increased and the new method has less influence on the calculation errors of far field scattering.

关 键 词：FDTD 网格长度 数值色散 平面波传播 远场散射 时域有限差分 

分 类 号：TN011[电子电信—物理电子学]