Patent ID: 8471157

Claim:
An EMI (electromagnetic interference) shielding device for isolating EMI via a wire hole through which a cable extends, the EMI shielding device comprising: a metal cylinder through which the cable extends, the metal cylinder having an end thereof inserted into the wire hole and engaged with a circumferential edge of the wire hole; and an effective amount of metal powder packed between the metal cylinder and the cable for shielding EMI; wherein the metal cylinder comprises two spaced blockers therein along a lengthways direction blocking off the metal powder, the cable extending through the blockers; and wherein the metal cylinder comprises an inner tube and an outer tube coiling around the inner tube, the inner tube being spaced from the outer tube, the inner tube having an end engaged with the circumferential edge of the wire hole, the blockers being arranged in the inner tube, the metal powder being packed between the inner tube and the cable.