How Does EMI Shielding Work?

Electromagnetic interference is all around us. It comes from humans (electronics), and it comes from nature (snow and electrical storms). In the electrical engineering world, EMI shielding is one of the most important resources to ensure electronics function properly. Electronic devices (medical and recreational) are susceptible to performance failure as a result of electromagnetic interference. These same electronics are known to radiate EMI into the world. Shielding and foam gaskets are used to protect our electronics from malfunctioning.

Barriers made of magnetic or conductive materials are applied to enclosures to isolate an electronic device from its surroundings. Shielding is also applied to cables for the same reason. EMI shielding is powerful, and it reduces the coupling of electromagnetic fields, radio waves, and electrostatic fields.

EMI shielding is an integral part of important laboratory and medical equipment. EMI shielding adds protection from harmful signals that interfere with performance. It is often used to protect equipment at broadcast facilities (TV and radio).

The United States Military uses EMI shielding in many of its defense applications. Modern warfare is changing and being prepared for an electromagnetic attack is an appropriate precaution. Encasing cables inside a grounded and conductive shield mitigates risks.

EMI Shielding

Shielding is used because it impedes the escape of negative signals coming from the conductor's core. At the same time, it prevents harmful signals from being added to the core of the conductor.

• The Two Best Ways to Reduce EMI and RFI
  If a circuit is exposed to a great deal of the energy, it will harm performance. In high enough doses, it can even be harmful to humans. EMI and RFI are essential for protecting devices and people.
• Weatherizing EMI Shielding and RFI Shielding
• Choosing Between Molding and Splicing