二维半空间时域有限差分瞬态场外推方法
姜彦南;葛德彪;杨利霞;于新华
【期刊名称】《西安电子科技大学学报（自然科学版）》 【年(卷),期】2014(000)002
【摘要】提出用于二维半空间时域有限差分的瞬态场外推计算方法。该方法把上半空间远区场分作3部分：第1部分是上半空间外推边界上电磁流辐射场沿直达波路径的贡献；第2部分是该电磁流辐射场沿反射波路径的贡献；第3部分是下半空间外推边界上电磁流辐射场沿透射波路径的贡献。关于后两部分的计算要点是：用斯奈尔定律确定外推边界上电磁流辐射场的反射点和透射点，并把它们投影至沿观察点方向的时间盒子中；计算电磁波从等效源至反射点或透射点所需的时间，以此确定真正的投影时间盒子；用相应极化波的反射或透射系数作为沿反射或透射路径对远场贡献的比例系数；最后用两个模型验证二维半空间瞬态场外推算法。计算结果与已报道成果具有很好的一致性。%An algorithm for extrapolating the transient field in two-dimensional half-space for the finite-difference time-domain(FDTD) method is firstly presented.In this algorithm,the far-zone scattered field consists of three parts.The first two parts of the field are generated by the equivalent electromagnetic currents at the extrapolation bound in upper space,propagating along the paths of directed and reflected waves,respectively.And the third part is resulted by that currents at that bound in lower space,its propagation following the path of the transmitted wave.To caculate the latter two parts,the reflection and
二维半空间时域有限差分瞬态场外推方法
