A new company called Energous has devised a method of wirelessly transmitting power over long distances. Its prototype system can beam 10 watts, more than enough to charge your smartphone or tablet, over a distance of 15 feet — and, rather importantly, it will track your device if you move around. The company hopes to commercialize its technology soon, with partner companies showing off the tech at CES in January 2015. It seems that the first generation of wireless charging — those awful, short-range charging plates — may finally be drawing to a close. The dream of having your smartphone and other mobile devices constantly topped up — while you sit on the sofa, while you stand in line at the coffee shop — may soon come to pass.
Usually when we write about wireless charging on ExtremeTech we’re referring to magnetic resonance, where you have two coils of wire (antennas, basically) that are both tuned to a certain frequency. When you pass electricity through one coil, it induces a resonant electromagnetic field in the other coil, (fairly) efficiently transferring energy through the air. This is the method that almost every upcoming wireless charging technology uses, including WiTricity (an MIT spin-off that has been trying to bring magnetic resonance wireless charging to market for a good 5+ years). Not Energous, though