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New Materials for EMI ShieldingGraphite fibers intercalated with bromine or similar mixed halogen compounds have substantially lower resistivity than their pristine counterparts, and thus should exhibit higher shielding effectiveness against electromagnetic interference. The mechanical and thermal properties are nearly unaffected, and the shielding of high energy x-rays and gamma rays is substantially increased. Characterization of the resistivity of the composite materials is subtle, but it is clear that the composite resistivity is substantially lowered. Shielding effectiveness calculations utilizing a simple rule of mixtures model yields results that are consistent with available data on these materials.
Document ID
19990042172
Document Type
Technical Memorandum (TM)
Authors
Gaier, James R. (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1999
Subject Category
Electronics and Electrical Engineering
Report/Patent Number
E-11590
NASA/TM-1999-209054
NAS 1.15:209054
Meeting Information
Electromagnetic Compatibility(Seattle, WA)
Funding Number(s)
PROJECT: RTOP 632-1A-1E
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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