任意方向平面波入射下有孔箱体屏蔽效能的估算

Estimation for Shielding Effectiveness of Aperture Cavity under Arbitrary Incidence Angle Plane Wave

根据Robinson等效传输线理论,估算了有孔屏蔽箱体在任意入射方向平面波照射下的屏蔽效能。该方法将任意入射方向平面波的传播矢量和电场矢量分解,使得复杂模型等效为两个不同极化方向平面波垂直入射箱体开孔平面的简单模型,从而推导了计算屏蔽效能的一般表达式。数值仿真结果与CST软件仿真吻合较好,验证了方法的有效性。分析了平面波入射仰角和方位角对有孔箱体屏蔽效能的影响,数值结果表明:在0°~90°范围内,箱体屏蔽效能随着平面波入射仰角的减小而增大,随着平面波入射方位角的减小而减小。

According to Equivalent Circuit Model Theory,shielding effectiveness of aperture cavity under arbitrary incidence angle was calculated. Electric field and the propagation vector of the arbitrary incidence angle plane wave were decomposed by vector analysis,which made complex model equivalent to two plane wave of different polarization direction vertical incidence the opening plane model,deduced the general expression for computing the shielding effectiveness. Numerical results are in good agreement with the data of CST. The effect of the incidence azimuth angle,elevation angle were also analyzed,the results indicate that,the shielding effectiveness increases when the incidence azimuth angle increases or elevation angle decreases.