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基于Bethe小孔耦合理论和腔内电磁场的本征模展开,建立了平面波照射下开孔矩形腔体电磁场分布的近似解析模型.该模型物理意义清晰,可以考虑开孔的形状、尺寸、个数及位置和入射波的传播与极化方向等参数的影响.该模型的计算结果优于传统的等效电路方法,与实验结果的一致性更好.计算分析了相关因素对电磁屏蔽效能的影响规律,所得结果对电磁屏蔽腔体的设计有指导意义.
Based on the Bethe hole coupling theory and the eigenmode expansion of the electromagnetic field in the cavity, an approximate analytical model of the electromagnetic field distribution of the rectangular cavity with open cells under the plane wave irradiation is established. The physical meaning of the model is clear, and the shape, size, And the propagation of the incident wave and polarization direction and other parameters.The results of the model are better than the traditional equivalent circuit method and the agreement with the experimental results is better.The impact of the relevant factors on the electromagnetic shielding effectiveness Law, the results obtained for the design of electromagnetic shielding cavity has instructive significance.