高功率微波对双层屏蔽腔体的孔缝耦合特性
Analysis on high power microwave aperture coupling of double layer shielding enclosure
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摘要: 用多模传输线模型对高功率微波与双层屏蔽腔体的孔缝耦合特性进行了研究，此方法可以考虑高功率微波孔缝耦合进入腔内时的较宽的频率范围。用这种模拟方法获得了双层屏蔽腔体微波耦合的一些规律性结果：双层屏蔽可以使得腔体内的耦合电场比单层屏蔽时有显著的减弱，这与FDTD方法的结论是一致的；双层屏蔽外腔体中的一些谐振会影响到内腔体的耦合系数，外腔体中的场模式经由内孔缝会影响内腔体中的场模式；不论是单层屏蔽还是双层屏蔽，保持每层孔缝总面积不变时，随着孔阵中孔缝数量的增加，进入腔体内的耦合电场也逐步地减弱，这与单层屏蔽时的结论一致；通风总面积不变的情况下，孔缝数量越多，屏蔽效能越好。Abstract: Transmission line method is extended to include multi-mode transverse electric cavity modes which are introduced by aperture coupling and it is used to analyze the coupling effectiveness of double layer rectangular enclosure with aperture to the wide band high power microwave electromagnetic pulse. The electric shielding effectiveness of single layer enclosure with aperture is compared with that of double layer enclosure with apertures. The simulation results show that: shielding effectiveness can be improved greatly with double layer shielding and it is worse on the resonance frequency of cavity modes. On the condition of aperture-cavity resonance, shielding effectiveness drops significantly in the center of inner cavity. FDTD result is compare to the results of transmission line model. F
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