EMI and EMI Shielding Overview
- EMI shielding is a technique of creating a barrier that prevents leakage of strong electromagnetic fields that can interfere with sensitive devices and signals.
- Electromagnetic interference (EMI) is the coupling of signals from one system to another. It is a problem for most electronics since it can decrease the performance of the circuit or even cause it to fail.
- EMI shielding operates under three mechanisms: reflection, absorption, and multiple reflections.
- Two main properties achieve EMI shielding: electrical conductivity and magnetic permeability.
- EMI shields are available as solid enclosures, wire mesh, screens, gaskets, O-rings, cable shields, and coatings.