Time-Domain Shielding Effectiveness of Enclosures Against a Plane Wave Excitation

Electromagnetic shielding of metallic enclosures with an aperture are simulated and measured in the frequency and time domain in this paper. Recently, several new figures of shielding effectiveness (SE) in the time domain have been proposed. Much work has been done regarding numerical simulations; however, little work related to measurements has been carried out. In this paper, we obtain the simulated and measured results for these SE definitions when an incident plane wave, with a determined bandwidth, excites the enclosure. The plane wave can be treated as a reference interference to compare with other cases. Measurements and simulations are in good agreement. This study evaluates the new definitions and compares them with the classical definition in the frequency domain. The effect of the probes, a dipole or a loop, has also been analyzed. Finally, the SE values are obtained for a sweep of the size of the aperture providing a unique value of equivalent SE for the most critical parameter and for a determined bandwidth, and allowing direct comparison with other enclosures.

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