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Why Should We Have EMI Shielding in the Life?

Any circuit or device that carries an electrical current is a potential source of EMI. The objective in electronic system design is to achieve electromagnetic compatibility between the subsystems in an electronic assembly and between that assembly and other electronic devices that it will encounter in its operating environment.

Any barrier placed between an emitter and a susceptor that diminishes or attenuates the strength of the potential interference qualifies as an EMI shielding.

The EMI shield effectiveness of an enclosure is a function of material and design, as well as the service conditions. Thus, radiation incident upon an EMI shielding barrier is absorbed, reflected or transmitted. For metal shields and high impedance fields, most of the energy is reflected; if the magnetic field is dominant, absorption is the principal mode of attenuation.


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