Contact variation and shielding perfomance of electromagnetic shielding gaskets

摘要

Poor data repeatability remains a problem facing industry in determining and reporting electromagnetic shielding performance of gaskets. This paper provides insight into this problem iwth the focus on gasket contact interfaces. A statistical contact characterization is conducted to show variation in contact perfomrance 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 experimetnal 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. This research is part of a larger effort to understand the mechanisms of variation in gasket shielding performance and to establish an approach for both gasket characterization and data report.