Jingsong Xie, Michael Pecht, and David F. Barbe
CALCE Electronic Products and Systems Consortium
University of Maryland
College Park, MD 20742
Poor data repeatability remains a problem facing industry in determining and reporting electromagnetic shielding performance of gaskets. This paper provides insight into this problem with the focus on gasket contact interfaces. A statistical contact characterization is conducted to show variation in contact perfromance of gaskets, and requirements on data reporting are discussed as well. Two types of commercial beryllium-copper fingerstocks, which are typical gaskets used in electromagnetic shielding, are investigated. The experimental data are analyzed using a log-normal-distribution-based analytical approach to quantify the variation of gaskets in contact resistance and shielding performance. The results indicate a significant contribution of electrical contact conditions to the shielding performance of gaskets.
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