Wireless power transmission systems become increasingly efficient as more devices are being powered, according to researchers at the Massachusetts Institute of Technology (MIT).
The research, which builds off of a previous study that used electromagnetic resonance between coils to transmit power without wires, used receiving coils small enough for practical use in homes and offices. The study involved setting up a larger sending coil and two smaller receiving coils, which resulted in less than 20 percent efficiency in power transfer. But, with two devices and two receiving coils, the efficiency jumped to 30 percent. Adding more devices should keep increasing the system's efficiency, in theory to 100 percent, says MIT's Andre Kurs.
The researchers say the receiving coils should continue to shrink to a size that eventually would make them practical for use in mobile devices.
From Network World
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