The novel three - dimensional finite - difference approximations of mur ' s absorbing boundary conditions are also presented in frequency - domain . then the ddm based on fdfd is investigated in the applications of three - dimensional electromagnetics problems . and it is used to analyze the leaky wave antenna based on image nonradiative dielectric ( nrd ) guide 最后，阐述了maxwell方程组和划分区域的despres传输条件的频域差分格式建立，在截断边界上构造了三维频域mur条件的差分近似，探讨了基于频域有限差分的区域分解法在三维电磁问题中的应用实现，并将该算法用于分析一种基于nrd波导结构的漏波天线。
