基于子网格材质平均的高阶FDTD(2,4)方法

Scheme of high-order FDTD(2,4) using subcell-average-material

文章提出了一种基于子网格材质平均的高阶FDTD(2,4)方法,通过对原网格内外环路所围区域进行二次剖分,分别得到内外环路的平均电磁参数;再通过加权平均得到等效电参数,避免了积分运算,简化了建模过程。FDTD(2,4)运算仍在原网格上进行,所以没有增加计算量。该方法用于求解三维介质球散射,数值结果表明,在相同计算量的条件下,该方法具有更高的精度。

A high-order finite-difference time-domain（FDTD） （2,4） method using subeell-average-material for the modeling of dielectric curved surfaces is presented. By introducing finer subcell in the inner loop and the outer loop of the mesh, the average electrical parameters of the inner loop and the outer loop are obtained. The equivalent electrical parameters are also obtained by weight averaging, which avoids the integral calcula- tion and simplifies the modeling process. The FDTI）（2,4） computing is carried out on the original mesh without any extra eomputing requirement. The electromagnetic scattering from three-dimensional die- lectric sphere objects is calculated by the proposed method. It is shown that compared with other methods, this method has better accuracy for the same computing requirement.