提高屏蔽腔体的屏蔽效能可增强民用航空机载电子系统的高强辐射场(HIRF)防护能力。基于Robinson模型, 提出一种可计算带有非中心孔阵金属屏蔽腔体屏蔽效能的修正模型。选用民航机载通信设备作为研究对象, 运用修正模型计算其屏蔽效能, 与三维电磁仿真软件的结果对比验证了所提模型的正确性。此外, 通过软件仿真分析了HIRF作用下不同孔阵、频率、位置对设备内部电场分布的影响。仿真结果可为民航机载电子设备的屏蔽壳体设计以及内部敏感器件布局提供参考。

Improving shielding effectiveness of the shield cavity can enhance the protection capability of High Intensity Radiated Field (HIRF) of the airborne electronic system in civil aviation.Based on Robinsons model,a modified model is proposed to calculate the shielding effectiveness of a metallic shield cavity with non-central aperture array.The airborne communication equipment in civil aviation is taken as the research object.The modified model is utilized to compute the shielding effectiveness of the airborne communication equipment in civil aviation,and the correctness of the model is verified by comparing with the results of the 3D electromagnetic simulation software.Moreover,the impact of different aperture arrays,frequencies and positions on the internal electric field distribution of the equipment is analyzed by software simulation.The simulation result can serve as a reference for the design of a shield cavity and the layout of internal sensitive devices for airborne electronic equipment in civil aviation.