Abstract: The accuracy of time domain integral equation (TDIE) methods for broadband electromagnetic scattering problems is studied. The impacts of different choice of temporal basis functions on the accuracy of the induced surface current,scattered far-field and radar cross-section (RCS) are examined. Numerical results show that: for closed scatterers, time domain combined field integral equations (TDCFIE) must be employed to suppress the resonant disturbance; whereas the induced currents and far-fields in time domain look accurate, the RCS defined in frequency domain may deviate obviously, which suggests that RCS could be the best quantity for accuracy checking.

Key words: TDIE, temporal basis functions, broadband scattering, accuracy analysis

摘要： 讨论了应用时域积分方程方法分析宽带电磁散射问题的精度问题，研究了选择不同的时域基函数对表面感应电流、散射远场和雷达截面的精度的影响。数值结果表明：对于封闭的散射体，必须使用组合场积分方程来消除内部共振；虽然时域感应电流和散射远场看起来很精确，但雷达截面有明显误差，这意味着雷达截面是检验精度的最好物理量。

关键词: 时域积分方程, 时域基函数, 宽带散射, 精度分析