FDTD法を用いた電磁界・サージ解析のための吸収境界条件の高性能化

摘要

In this paper, a new absorbing boundary condition based on the advection equation has been proposed, which considers the attenuation of electromagnetic waves propagating towards the absorbing boundaries. The validity of the proposed condition has been tested by comparing the results, calculated using the FDTD method with the proposed absorbing boundary condition, with those calculated with other representative absorbing boundary conditions such as Liao's first- and second-order conditions. It has become clear that the proposed absorbing boundary condition is more effective than the other representative advection-equation-based absorbing boundary conditions.%FDTD（Finite Diffrence Time Domain）法は，Maxwell方rn程式の電界および磁界に関する2つの回転の式を時間，rn空間に対して差分化し，解析空間の電磁界の挙動を時間領rn域で求める手法である。この手法を用いた解析は直交座標rn系で行なわれるのが一般的で，解析対象を含む全ての解析rn空間を座標軸に直交あるいは平行な辺または面を有する微rn小直方体（セル）に分割する必要がある（2次元解析の場rn合には，セル形状は長方形）。