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为更好地评价电磁屏蔽材料对静电放电电磁脉冲的屏蔽效能,对静电放电脉冲激励下的材料的屏蔽效能进行了时域测试研究。以静电放电电磁脉冲为注入源,结合宽带同轴测试夹具和数字存储示波器,对一种平面材料的屏蔽效能进行了时域测试。通过得到的屏蔽前后的信号,计算了不同激励电压下该材料的峰值屏蔽效能,结果表明激励电压的大小对该材料的电磁脉冲屏蔽效能影响不大。通过对屏蔽前后信号的FFT变换计算了其频域幅频特性曲线,与频域实验测试所得的幅频特性曲线进行了对比,结果比较一致。表明该时域测试系统能够可靠地评价材料对高压静电放电电磁脉冲激励下的衰减能力。
In order to evaluate the shielding effectiveness of the electromagnetic shielding material to the ESD pulse better, the shielding effectiveness of the material under the ESD excitation is tested in time domain. Electrostatic discharge electromagnetic pulse as the source of injection, combined with broadband coaxial test fixture and digital storage oscilloscope, conducted a time-domain test of the shielding effectiveness of a planar material. The shielding effectiveness of the material under different excitation voltages was calculated by the signal before and after the shielding. The results show that the excitation voltage has little effect on the electromagnetic pulse shielding effectiveness of the material. The frequency-domain amplitude-frequency characteristic curve is calculated by the FFT transform of the signal before and after shielding, which is compared with the amplitude-frequency characteristic curve obtained in the frequency-domain experiment. The results are consistent. It shows that the time-domain test system can reliably evaluate the material’s attenuation ability under the excitation of high voltage electrostatic discharge electromagnetic pulse.