NU-FDTD在腔体孔缝电磁耦合分析中的应用
Application of NU-FDTD in Cavity Aperture Electromagnetic
Coupling Analysis
摘要 由电磁学的基本规律麦克斯韦方程差分形式即时域有限差分(Finite Different Time Domain,
FDTD)导出不均匀网格的FDTD差分形式,即不均匀网格的时域有限差分法(Non Uniform Grid
Finite Different Time Domain,NU-FDTD),并提出了在腔体孔缝电磁耦合分析中采用NU-FDTD时,网格和时间步长划分的原则是:导体边界采用局部均匀细网格法,其它空间采用渐变不均匀法。实验结果表明,这种方法不仅节省计算时间,而且精度高。
关键词 电磁耦合;不均匀网格;时域有限差分
Abstract The differential form of Maxwell's equations by the basic law of
electromagnetism which is named Finite Different Time Domain (FDTD) can export the
differential form of nonuniform grid FDTD (NU-FDTD). It is pointed out that while using
NU-FDTD for analysis of the cavity aperture electromagnetic coupling, the principle of
dividing the grid and time step is that conductor boundary uses local uniform fine-mesh
method while other space uses uneven gradient method. The experiment results show
that this approach is not only timesaving, but also more accurate.
Keywords electromagnetic coupling; nonuniform grid; FDTD
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