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本文基于等效电路法,提出一种通过BLT方程计算带孔缝箱体屏蔽效能的方法,可以快速准确计算任意入射、极化平面波照射箱体以及任意位置开孔和双面开孔箱体的屏蔽效能.根据等效电路法求解出孔缝散射矩阵,依据信号流图建立传播关系和散射关系方程,并推导出包含孔缝耦合效应的广义BLT方程.将BLT方程计算结果与等效电路法计算结果以及CST仿真做对比,验证了方法的正确性.与等效电路法相比,在同一孔阻抗下,孔缝散射矩阵包含箱体内外能量之间的相互耦合作用,本方法计算结果精度更高,能预测更多箱体谐振模式;与CST仿真相比,本方法占用时间和资源少,可以对箱体参数进行规律性研究.
Based on the equivalent circuit method, this paper proposes a method to calculate the shielding effectiveness of a slotted box with BLT equation, which can quickly and accurately calculate the incident and polarized plane wave radiation box and any position of openings and double-sided open box Shielding effectiveness is solved by the equivalent circuit method, the propagation equation and scattering equation are established according to the signal flow diagram, and the generalized BLT equation including the coupling effect is deduced.The calculated results of BLT equation are compared with the equivalent circuit method Compared with the equivalent circuit method, the aperture scattering matrix contains the mutual coupling between the energy inside and outside the box, compared with the equivalent circuit method, the accuracy of the method is more accurate High, which can predict more box resonance modes. Compared with CST simulation, this method takes less time and resources, and can study the regularity of box parameters.