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Duke metamaterials

Selectively Shielding

Wireless recharging using magnetic fields sounds like a great advance, but it could present problems for some technologies. The David R. Smith research group in Duke Engineering has developed a thin sheet of metamaterial in which repeating patterns of conductive material would shield electronics from a charger's magnetic field while letting certain frequencies through. Such a shield might also be used as a reflector to focus wireless charging and make it more efficient.