Time domain shielding effectiveness (SE) of metallic enclosures with apertures against electromagnetic pulse excitation has been analytically estimated and correlated to the frequency domain characteristics. The method is based on the analysis of the transient process at the aperture and an equivalent magnetic current source, to derive the initial peak amplitude appearing at the very beginning of the coupled field waveforms. The equivalent circuit model is utilized to analytically describe the frequency domain SE data. Then, a simple correlation formula has been derived, which relates the peak value reduction of the E-field and H-field to the specified spectral data minus a specially defined factor. Especially, the correlation for the E-field is shown to link the spectral SE data near the fundamental resonant frequency of TE101 mode with the peak amplitudes in time domain. A series of numerical and experimental cases have been checked to confirm the applicability of the analytical formulas. Comparisons between the data and the analysis exhibit reasonable agreements.

中文翻译：

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带孔金属外壳的时域和频域屏蔽效能分析相关性

带有孔的金属外壳对电磁脉冲激励的时域屏蔽效率 (SE) 已被分析估计并与频域特性相关联。该方法基于对孔径和等效磁流源处的瞬态过程的分析，以推导出出现在耦合场波形最开始处的初始峰值幅度。等效电路模型用于分析描述频域 SE 数据。然后，推导出了一个简单的相关公式，该公式将 E 场和 H 场的峰值减少与指定的光谱数据减去专门定义的因子相关联。尤其，电场的相关性显示出将 TE101 模式的基本谐振频率附近的频谱 SE 数据与时域中的峰值幅度联系起来。已经检查了一系列数值和实验案例，以确认解析公式的适用性。数据和分析之间的比较显示出合理的一致性。