computer hardware, consumer electronics, electronic components

EMI/RFI shields

Electromagnetic interference (EMI) is a common problem faced during the operation of electronic equipment. EMI is unwanted electromagnetic energy entering or emitting from a specific piece of electronic equipment, thereby causing interference. During normal operation, electronic equipment typically generates undesirable electromagnetic energy that can interfere with the operation of proximately located electronic equipment due to EMI transmission by radiation and conduction. The electromagnetic energy can be of a wide range of wavelengths and frequencies. The electromagnetic energy can by of a wide range of wavelengths and frequencies. To minimize the problems associated with EMI, sources of undesirable electromagnetic energy may be shielded and electrically grounded. Sources of undesirable electromagnetic energy or radio frequency interference may be shielded and electrically grounded. EMI/RFI shielding is designed to prevent both ingress and egress of electromagnetic energy relative to a housing or other enclosure in which the electronic equipment is disposed. It is common practice to place apparatus that emits electromagnetic radiation (EMR), or which is sensitive to radio frequency interference (RFI) within a shielded enclosure. EMI shielded enclosures are typically constructed of conductive materials that operate to reflect the radiation component of the EMI and to drain to electrical ground the conducted component of the EMI. Specialized EMI gaskets have been developed for use in gaps and around doors to provide a degree of EMI shielding while permitting operation of enclosure doors and access panels.


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