EMI Theory

Electronic devices operating normally in their intended environment, without conducting or radiating excessive amounts of electromagnetic energy, or being susceptible to such energy from internal or external sources, are in the state of electromagnetic
compatibility, or EMC. Electromagnetic interference, EMI, is radiated or conducted energy that adversely affects circuit performance, and thus disrupts a device’s EMC. Many types of electronic circuits radiate or are susceptible to EMI and must be shielded to ensure proper performance. Establishing basic electromagnetic compatibility in any electronic device generally requires two distinct approaches. The first approach is to reduce EMI generated from internal sources. It is the best accomplished by designing an electronic circuit or device so that it inherently generates less EMI. Residual EMI may then be suppressed or contained within the enclosure by appropriate filtering and shielding methods. Filtering cables at the point where they enter or leave the enclosure will reduce conducted emissions. Radiated EMI may be eliminated or reduced by the use of shielded enclosures and shielding materials. The second method for establishing EMC in a device is to improve its immunity (or reduce its susceptibility) to interference from external EMI sources.

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Sam Xu
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Beryllium Copper Finger Strips and Industrial Enclosure Shielding