28 Dec '15, 5pm

Is Real Wireless Phone Charging Nearly Here?

Is Real Wireless Phone Charging Nearly Here?

Photo: Evan Ackerman Look, Ma! No Wires: WattUp’s microwave beam antennas can wirelessly charge a cellphone from across a room. In 1891, Nikola Tesla performed an amazing demonstration: He illuminated a gas discharge tube (essentially a fluorescent bulb) with an electric field, showing that it was possible to transmit electric power without wires . Since then, advances in electronics and computing have given us portable versions of his contemporaries’ inventions—Bell’s telephone and Edison’s phonograph. But when it comes to powering up those devices, we’re still tethered in place. The best we’ve managed to engineer so far is inductive charging : Place your cellphone on top of a resonant inductive charging pad and the pad’s oscillating magnetic field generates a current in the phone’s receiving antenna. The wire may be gone, but the device is still closely bound to the pad ...

Full article: http://spectrum.ieee.org/consumer-electronics/portable-de...

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