A group of researchers at MIT have made yet another breakthrough in wireless power. By imbedding a large copper coil in a wall or ceiling and using electromagnetic resonance to transfer power between multiple devices, physicists André Kurs, Robert Moffatt, and Marin Soljačić have managed to generate fairly high efficiency by strategically coupling multiple devices as opposed to a single device. When the devices resonate at the same frequency, power is transferred with little interference by other objects resonating out of that frequency. Efficiency decreases with distance, but the system works from more than 2 meters away.
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