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Study on corrosion-induced shielding-degradation of EMI gaskets

  • The deterioration of the shielding performance of electromagnetic interference finger stock gaskets in a corrosive environment is investigated. The visualization of the real contact area shows a drastic reduction of the engaged active contact region between fingers and their mating surfaces in presence of corrosives residues. In fact, additional openings occur besides the “Tlike” holes due to the porous nature of gaskets. This leads to a strong degradation of the shielding effectiveness. Modified Bethe’s theory is used to estimate the equivalent circuit parameters while the shielding effectiveness in terms of ratio between two transfer functions is obtained upon applying the filter theory. Quantitative measurements carried out for different gasket types show a good agreement with calculated results, demonstrating thus the validity of the approach.

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Author of HS ReutlingenPouhè, David; Tcheg, Paul
Erschienen in:IEEE transactions on electromagnetic compatibility
Place of publication:New York, NY
Document Type:Article
Year of Publication:2016
Tag:Bethe’s theory; aperture coupling; dipole moments; equivalent circuit parameters; filter theory; gasket; shielding effectiveness (SE)
Page Number:8
First Page:1052
Last Page:1059
DDC classes:620 Ingenieurwissenschaften und Maschinenbau
Open Access?:Nein
Licence (German):License Logo  Lizenzbedingungen IEEE