Electromagnetic Interference (EMI)

Definition - What does Electromagnetic Interference (EMI) mean?

Electromagnetic interference (EMI) is a phenomenon where one electromagnetic field interferes with another, resulting in the distortion of both fields. This is commonly observed in radios when switching between frequencies and static is heard, as well as on over-the-air TV when the picture becomes distorted because the signal has been distorted.

Electromagnetic interference is also known as radio frequency interference (RFI).

Techopedia explains Electromagnetic Interference (EMI)

Electromagnetic Interference is a disturbance in the radio frequency spectrum that affects fields even if their frequencies are not aligned. This is because electromagnetic radiation can still interfere with each other even if they are not on the same frequency, and this is exacerbated by the fact that devices emitting electromagnetic waves have a tendency to also transmit at lower power on harmonic side bands, which is why an FM radio might pick up powerful signals from a nearby CB radio.

EMI can be a problem on electronic devices since electronic circuits are very susceptible to EMI because electromagnetic radiation can easily be picked up by any conductor, which is why speakers sometimes make noise when a nearby cell phone is receiving a call or text message. This is because the coil in the speakers is acting like an antenna which captures the EMI emitted by the cell phone.

EMI can be a serious problem in critical systems that use radios such as on an airplane, which is why all electronic devices are required to be turned off during takeoff and landing, as they might cause interference with communication between the pilot and ground control or other critical systems being used by the plane.

Share this:

Connect with us

Email Newsletter

Join thousands of others with our weekly newsletter

The 4th Era of IT Infrastructure: Superconverged Systems
The 4th Era of IT Infrastructure: Superconverged Systems:
Learn the benefits and limitations of the 3 generations of IT infrastructure – siloed, converged and hyperconverged – and discover how the 4th...
Approaches and Benefits of Network Virtualization
Approaches and Benefits of Network Virtualization:
Businesses today aspire to achieve a software-defined datacenter (SDDC) to enhance business agility and reduce operational complexity. However, the...
Free E-Book: Public Cloud Guide
Free E-Book: Public Cloud Guide:
This white paper is for leaders of Operations, Engineering, or Infrastructure teams who are creating or executing an IT roadmap.
Free Tool: Virtual Health Monitor
Free Tool: Virtual Health Monitor:
Virtual Health Monitor is a free virtualization monitoring and reporting tool for VMware, Hyper-V, RHEV, and XenServer environments.
Free 30 Day Trial – Turbonomic
Free 30 Day Trial – Turbonomic:
Turbonomic delivers an autonomic platform where virtual and cloud environments self-manage in real-time to assure application performance.