What are the Differences Between RFI and EMI?

Although different, EMI and RFI are part of the same phenomena. Electromagnetic interference (EMI) and radio frequency interference are often interchangeable terms, but that is because radio waves are considered a subset of the electromagnetic spectrum. EMI, in practice, refers to short-range interferences primarily caused by high-frequency emissions coming from within the devices. RFI, on the other hand, represents longer wavelengths interference from external sources. RFI and EMI shielding are related phenomena, and they are common issues electronic engineers must deal with. EMI and RFI affect devices differently, so engineers must know how to protect devices against RFI and EMI.

Shielding EMI

The modern world we live in is filled with RFI. So many of the devices we use daily, such as radios, smartphones, Wi-Fi transmitters, and televisions are negatively affected by unwanted RFI. EMI and RFI are both present in the natural world (solar activity), but the biggest issues stem from human made products and devices.

Considering that EMI and RFI constantly surround us, EMI RFI shielding is a tool that is essential for building many of the electronic devices we rely on daily. When an engineer adds 10 dB of RFI shielding or EMI shielding, the energy of the incident wave is changed by roughly a factor of 10. When using a 20 dB shield, it can reduce energy by a factor of 100.

You should not hesitate to give our team a call for more information about protecting electronics from EMI and RFI. We are problem solvers and can help you get past any issues associated with EMI and RFI.

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