为明晰超宽带电磁脉冲对典型无线电引信的干扰和损伤影响，应用时域有限积分法对典型无线电引信腔体耦合效应进行了数值模拟研究。以典型无线电引信腔体及其低频电路板实际结构为对象进行建模，仿真研究了超宽带电磁脉冲对该引信腔体的耦合特性，分析了引信高低频电路间连线过孔参数和脉冲参数对耦合效应的影响规律，研究了加装印刷电路板对耦合效应的影响。结果表明: 与圆形和正方形孔缝相比，矩形孔缝的耦合系数受极化方向的影响显著; 脉冲上升时间越小，耦合系数越大; 加装印刷电路板后，腔体相同位置处耦合系数下降，谐振频率改变。

To understand the interference and damage effect of ultra-wideband electromagnetic pulse (UWB-EMP) on a typical radio fuze, the coupling effect of typical cavity was researched based on time domain finite integral method (FIT). Taking the cavity of typical radio fuze and low-frequency printed circuit board (PCB) as simulation model, the influences of aperture parameters, pulse parameters and PCB in cavity on coupling effect were analyzed. The results show that the coupling coefficient of rectangular aperture is affected by polarization direction obviously compared with those of circular and square apertures, and the coupling coefficient increases with the decreasing of UWB pulse rise time. Furthermore, the coupling coefficient decreases and resonance frequency changes after inserting a PCB into the cavity of the fuze.