2008 Volume 73 Issue 623 Pages 123-129
Electromagnetically shielded rooms always have joints between the shielding materials. The simplest configuration is a lap joint in which overlapping sheets are fastened at regular intervals by screws or by other types of fasteners. The shielding effectiveness of such joints with slit-shaped apertures has not been evaluated quantitatively. Measurements of electromagnetic wave leakage from slit-shaped aoertures were made with the intent of determining the relationship between the joint configurations and shielding effectiveness. The results indicated that the shielding effectiveness is dependent on the wavelength and the dimensions of the constituent parts. Numerical analysis using the FDTD method was carried out in order to explain the phenomena observed in the experiments. The data obtained through this study will be utilized in the future for quantitative evaluation of the shielding effectiveness of slit-shaped apertures.
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