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在讨论了基于时域有限差分法和完全匹配层技术的数值模拟方法之后，首先从运动电荷和电力线的角度直观地描述了脉冲电磁波的辐射过程，然后进一步从场与电荷相互作用的角度分析了天线上电荷是如何被加速以及如何维持其运动状态的，指出了开放空间中突然出现的时变电场（位移电流）是脉冲电磁波辐射的根本原因．文中还对局部电阻加载的天线和局部弯曲的天线进行了研究，以进一步说明上述观点．对多种情况下的脉冲辐射过程进行了数值模拟，并给出了电场的等高线和空间波形图，这些图形对理解脉冲电磁波的辐射机理非常有益．
After discussing the numerical simulation method based on finite difference time domain method and perfect matching layer technique, the radiation process of pulsed electromagnetic wave is described intuitively from the viewpoints of moving charge and power line, and then the interaction between field and charge is further analyzed How the charge on the antenna is accelerated and how to maintain its motion state indicates that the sudden change of electric field (displacement current) in the open space is the fundamental reason of the pulsed electromagnetic wave radiation. In this paper, we also study the local resistance loading antenna and the local bending antenna to further illustrate the above point of view. The pulse radiation process under various conditions is numerically simulated and the contours and space waveforms of the electric field are given. These figures are very useful for understanding the radiation mechanism of pulsed electromagnetic waves.