关键词: 时域积分方程, 时域基函数, 宽带散射, 精度分析

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