| 摘要: |
| 飞行器格栅结构能够阻碍电磁波入射到腔体结构形成强的后向散射。为研究菱形栅孔的电磁屏蔽规律，采用波导传输理论和Floquet定理分析了均匀格栅的电磁屏蔽原理。针对孔径边长、线宽和两边夹角等5组几何参数，建立变参数模型并计算了传输参数玈21和可屏蔽带宽占比。仿真结果表明,孔径边长和格栅深度对屏蔽效能影响较大；随着两边夹角增加,TE和TM极化的屏蔽效能呈现相反的增减趋势。最后，选取屏蔽效能较优的栅孔，构建了加装格栅的进气腔体模型，计算了掠入射状态下的散射特性，结果表明，在水平极化和垂直极化下，格栅均能有效屏蔽腔体散射。 |
| 关键词: 飞行器格栅 雷达散射截面（RCS） 电磁屏蔽 电磁特性分析 |
| DOI：10.20079/j.issn.1001-893x.221009001 |
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| 基金项目: |
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| Electromagnetic Characteristics Analysis of Aircraft Grille Structure |
| WANG Yijun,AI Junqiang,CUI Li,ZHANG Weiren |
| (AVIC The First Aircraft Institute，Xi’an 710089，China) |
| Abstract: |
| Aircraft grille structure can prevent electromagnetic waves from entering the cavity structure to bring about intense backward scattering.To study the electromagnetic shielding laws of the diamond-shaped cell grille,the principle of electromagnetic shield of the homogeneous grille is analyzed by using the theory of waveguide propagation and Floquet theorem.The variable parameter models are established referring to five geometrical parameters of the cell,such as the edge length,the wire thickness and the angle of adjacent edges,etc.And then both the propagation parameter 玈21 and the shielding bandwidth radio are calculated.Numerical simulations indicate that,the edge length and the grille depth are the main factors to influence the shielding effectiveness;with the angle of the adjacent edges increasing,the shielding effectiveness at TE and TM polarization shows inversion results.Finally,an inlet cavity covered by a grille based on the optimized cell is modeled,and the scattering characteristic is calculated at grazing angle.The results show that the grille can shield the scattering of the cavity to a quite low level at the horizontal polarization as well as the vertical polarization. |
| Key words: aircraft grille radar cross section（RCS） electromagnetic shielding electromagnetic characteristics analysis |
