EMP激励下带孔缝金属机箱的耦合特性研究

研究了电磁脉冲（EMP）对理想带孔缝金属机箱的耦合特性，对耦合电场的时域和频域特性以及不同结构和不同数量孔缝的耦合结果进行了讨论。耦合电场的分布呈现明显的谐振现象，谐振中心位于机箱中心区域。对于面积相同的孔缝，当脉冲的极化方向与孔缝短边平行时，矩形缝耦合的电场能量最大，圆孔耦合的电场能量最小。在保持开孔面积不变的情况下，将较大的单孔缝分解成多个较小的孔缝，可有效减小耦合能量。另外，采用双层屏蔽也可显著减小耦合能量。

Study of the Coupling Characteristic of Metallic Enclosures with Apertures Excited by EMP

Coupling characteristic of metallic enclosures with apertures excited by EMP was investigated. The coupling results of different configurations and number of apertures were discussed. The results showed that the electric field evolvement exhibits resonant behaviour evidently and the resonant peak is the highest at the centre inside the enclosure. For the case of the same area of a single aperture, when the polarization direction is parallel to the shorter side of the rectangular, the coupling energy of the rectangular aperture is the largest, and the circle aperture is the lowest. Keeping the total area unaltered, dividing the single larger aperture into multiple smaller apertures, the coupling energy decreases. Besides, the coupling energy of the enclosure with double layers wall decreases significantly.