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3. Attenuation measurements for shielded loudspeakers and shielded cables
3.1 How electromagnetic fields penetrate shielded enclosures
Consider a shielded enclosure consisting of a parallelepiped with metal walls made of a highly electrically conductive material such as copper. When the six walls of the enclosure form ideal junctions with no contact resistances and no openings, however tiny, the enclosure constitutes a shield with high electromagnetic immunity. In this case, when subjected to an incident electromagnetic plane wave, the attenuation generated by the enclosure can exceed 120 dB.
Unlike the infinitely flat shielding model described in the previous steps, it is virtually impossible to calculate the attenuation provided by the metal parallelepiped. Only sophisticated numerical simulations can resolve this difficult question....
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Attenuation measurements for shielded loudspeakers and shielded cables
Bibliography
Events
CEM 2012 Rouen
16th International Symposium and Exhibition on Electromagnetic Compatibility
Series of French-language symposia organized in the French-speaking world every two years
Rouen April 25-26-17, 2012 http://cem2012.esigelec.fr
EMC Europe Rome 2012...
Standards and norms
- Electrical and optical connectors – Test methods. Part 213: Shielding effectiveness from 100 MHz to 1 GHz - NF EN 2591-123 - 03-1998
- Communication cables – Specification of test methods. Part 1-6: Electrical test methods – Electromagnetic performance - NF EN 50 289-1-6 - 06-2002
- Méthodes de mesures d'atténuation de blindage et d'enceintes faradisées. DGA, Ministère de la défense - GAMT 20 - 1992
- Techniques...
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