A Faraday cage (sometimes called a Faraday shield, RF cage or EMF cage) is a RF shielded enclosure formed by conducting material or by a mesh of such material. The enclosure is like a sealed tin can; it keeps the electromagnetic fields inside, and blocks the entry of external electric fields and radiofrequency waves. Faraday cages are named after an English scientist Michael Faraday, who is credited with their invention in 1836.
Typical LBA EMFaracages currently in use