摘要
高空核爆电磁脉冲(HEMP)对电子/电气设备构成严重威胁,是电磁兼容与电子/电气设备安全领域的重要研究内容。基于时域有限差分法(FDTD)的总场-散射场体系建立仿真空间,推导了连接边界的一维平面波引入方法,选择双层金属腔体为研究对象,仿真分析了腔体在HEMP平面波作用下透过孔缝在各采样点的响应过程。仿真结果显示,各采样点都出现了明显的振荡波形,其中外金属腔体孔缝中心比内金属腔体内部中心点耦合电场的峰值大;相同面积下,正方形孔、矩形孔的耦合电场比圆孔的耦合电场小;内部腔体与外部腔体在孔缝一侧距离的大小也会对耦合结果产生影响,间距越大,内部耦合电场的衰减越多。所得结论有利于指导双层金属腔体的电磁防护设计。
High-altitude electromagnetic pulse（HEMP） poses a serious threat on the electronic/electrical equipment,which is an important research field of electromagnetic compatibility（EMC） and the security of electronic/electrical equipment.Computing model is built by the total-field/scattered-field of the finite difference time domain method（FDTD）,and 1-D plane wave method is imported in the connecting surface.Then,the apertures′ response of double metal cavities under the HEMP plane wave is simulated and analysed using FDTD.The simulation results show that all samples are showing clear oscillatory shape,and the peak electric field in aperture center of external metal cavity is larger than that of the center point of internal metal cavity.With the same aperture′s size,the internal coupling electric fields of the square aperture,rectangular aperture are smaller than that of circular aperture.The distance of the apertures between internal cavity and external cavity will also affect the coupling results,and the greater distance makes more attenuation of the internal coupling electric field.The conclusions are able to provide guidance for the protection design of double metal cavities.
出处
《电讯技术》
北大核心
2010年第11期114-118,共5页
Telecommunication Engineering
