Near field penetration through a perforated flat screen

A near-field analysis of periodically perforated flat screens is presented. Such an analysis is mandatory in many practical situations, where the source and shield are in each other's vicinity. A specific geometry for the analysis of the shielding performance is proposed, based on two current loops (used as excitation and receiving antennas). In this way, a quantitative modeling of the near-field shielding effectiveness can be obtained. Such a geometry links up very well with measurement techniques and existing EMC (electromagnetic compatibility) standards.<
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