弹体内置矩形腔屏蔽效能分析

为提高导弹强电磁脉冲防护能力，采用有限积分法对弹体内置矩形腔体的屏蔽效能进行了数值模拟。重点分析了双层嵌套腔体屏蔽效能与单层腔体屏蔽效能之间的关系，以及末制导雷达天线转动对壳体屏蔽效能的影响。结果表明：双层嵌套在L频段可提高屏蔽效能30 dB左右，但在S频段嵌套腔体与内层腔体的屏蔽效能相当；当外层腔体与内层腔体上孔缝共振频率相近时，嵌套腔体屏蔽效能会急剧恶化；天线转动对屏蔽效能的影响与入射波频段相关。该研究对提高导弹电磁防护能力具有指导意义。

Analysis of Shielding Effectiveness of Rectangular Cavity in Missile Enclosure

To harden missile system against attack of electromagnetic pulses(EMP),coupling processes of EMP into the nested cavity with rectangular slot are investigated.The relationship of shielding effectiveness(SE) between nested cavities and individual cavity is analysed.The influence of antenna’s swing on the SE is taken into account.The results show that nested cavities can improve the cavities’ SE 30 dB in L band.But in S band SE of nested cavities is approximate to that of the inside cavity.If the resonance frequencies of outside and inside cavities are approximate,the SE of nested cavities will be deteriorated.The influence of antenna’s swing on SE depends on the frequency of incident wave.The study is significant to improve the defense ability of missile system against EMP effects.