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Near Field Coupling of Components and Structures to Ventilation Openings can Reduce Chassis Shielding Effectiveness
Keywords: Ventilation, Near Field Coupling, Proximity
Shielding effectiveness of chassis ventilation is often calculated and/or measured in a far field plane wave environment. However, real products often have components such as vertical DC/DC converters or vertical DDR memory modules close to perforated ventilation apertures. In some cases the shielding effectiveness of the ventilation can drop substantially as near field coupling effects dominate. 3D EM simulations together with measured data will be presented.
Jeff Evans, EMC Engineer
Cisco Systems, Inc.
San Jose, CA

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