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针对雷电波通过传输线在不同孔缝屏蔽腔内对电子设备造成损坏等问题,通过对孔缝屏蔽腔体屏蔽效能的理论分析,并采用(impulse current generated system,ICGS)雷电冲击平台模拟8/20μs波形的雷电流,对不同孔径的屏蔽腔体进行试验分析。试验表明:金属屏蔽腔体对1.75 GHz雷电电磁信号的屏蔽效能与2.5 GHz的雷电电磁波相比,其屏蔽效果更好;当屏蔽腔体表面的孔缝直径为30 mm时,腔体对雷电电磁波的屏蔽效果最好,范围为16.5 dB~18 dB,且当雷电波的波长大于其截止波长时,屏蔽腔体对雷电电磁波的屏蔽效果最佳。为腔体防雷工作提供了理论依据及数据参考。
Aiming at the problems of lightning damage caused by thunder and lightning waves through the transmission line in different hole sockets, the shielding effectiveness of hole sockets is studied theoretically and impulse current generated system (ICGS) lightning impulse platform is used to simulate 8 / 20μs Waveform of the lightning current, the shielding aperture of different aperture for experimental analysis. The experimental results show that the shielding effectiveness of the metal shielding cavity on 1.75 GHz lightning electromagnetic signal is better than that of 2.5 GHz lightning electromagnetic wave. When the aperture diameter of the shielding cavity is 30 mm, Has the best shielding effect, ranging from 16.5 dB to 18 dB. When the wavelength of the lightning wave is greater than its cutoff wavelength, the shielding effect of the shielding cavity on the lightning electromagnetic wave is optimal. For the cavity lightning protection provided a theoretical basis and data reference.