Shielding in Enclosures with Apertures
The fast data and edge rates of modern high-speed digital electronics often necessitate the use of some type of shielding to comply with EMI regulatory or other design requirements. The specifics of the shielding for a particular type of product and the expectations for EMI reduction can vary widely. At one end of the spectrum might be the transmitter or receiver of a wireless communication link operating in the microwave region. In this case, the shielding enclosure will typically be a cast or machined conductive enclosure. The distinct pieces of the enclosure might be screwed together, with careful attention devoted to the seam geometry at the microwave design frequency in order to prevent leakage from the interior or interference from external sources. All penetrations of the shielding enclosure will be carefully designed. Signals into or out of the design will be on shielded cables, with connectors that have 360° connections, e.g., a coaxial connector. Any microwave signals will be on coaxial cables. An electronic design requiring this level of attention to the shielding enclosure will be one for which cost is not an issue, or the design cannot function without such intricate attention to every enclosure penetration.
KeywordsMagnetic Source Effective Shield Enclosure Wall Metal Shield Tangential Electric Field
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