Time-domain test for material electromagnetic pulse shielding effectiveness based on shielding black-box windows method

In order to remedy the deficiencies of time-domain test methods of shielding effectiveness (SE) of materials in common use, a method called windowed semi-anechoic box is used for time-domain test of the SE of materials. The impact of such factors on test results as the position of test points, box size, window size, thickness and conductivity of materials, etc., is analyzed in frequency-domain. The impact of the position of test point on peak ratio SE and the ratio of electromagnetic pulse (EMP) rise time unloaded and loaded materials against different rise time of EMP is analyzed in time-domain, in order to get some recommendations for the use of the method of windowed semi-anechoic box. The results show that the method of windowed semi-anechoic box can be used to distinguish the shielding performance of different materials for each frequency component and to evaluate the overall protection performance of materials against EMP.