What iselectromagnetic interference

Electromagnetic interference (EMI), also known as radio frequency interference (RFI), occurs when an external source generates a disturbance that affects an electrical circuit through electromagnetic induction, electrostatic coupling, or conduction. EMI can cause performance issues or even complete failure of electronic devices. This phenomenon can affect any device with electronic circuitry, and it is becoming more important as electronic devices become more complex and the use of the electromagnetic spectrum increases.

Sources of EMI

EMI can be caused by both man-made and natural sources. Common man-made sources include ignition systems, cellular networks, and electronic devices such as computers and TVs. Natural sources of EMI include lightning, solar flares, and auroras. AM radios are often affected by EMI.

Understanding EMI Issues

EMI issues can arise when there is a source, a path, and a receiver involved. The electromagnetic energy from the source travels through the path and interferes with the operation of the receiver. EMI can cause a range of effects on a data path, from increased error rates to the complete loss of data. Various industries, such as military, defense, communication systems, home appliances, and aerospace, are susceptible to EMI issues.

Protecting Against EMI

To protect against EMI, shielding and grounding are often used. Shielding involves enclosing electronic devices in a conductive material that blocks or absorbs electromagnetic radiation. Grounding involves establishing a connection to the earth that allows excess electrical energy to flow safely away from the device. In addition to shielding and grounding, proper circuit design and layout can help prevent EMI issues.


What is the difference between EMI and EMC?

EMC stands for electromagnetic compatibility, which refers to the ability of electronic devices to operate without interference in the presence of other electronic devices or electromagnetic fields. EMI is a type of interference that can cause EMC issues.

Can EMI be harmful to humans?

EMI in itself is not harmful to humans, but it can interfere with medical equipment and other critical devices. It is important to protect against EMI in these situations.


Understanding electromagnetic interference is crucial in ensuring the reliable operation of electronic devices. EMI can cause performance issues or even complete failure of devices, and it can be caused by both man-made and natural sources. Proper shielding, grounding, circuit design, and layout can help prevent EMI issues in various industries.

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