Wireless Phone Charging Picks Up Steam

Newer technologies, growing consumer interest and adoption by gadget makers are breathing fresh air into the concept

One advanced technology looks set to be faster, and able to free users from charging docks. Called resonant coupling, it is an upscale cousin of inductive coupling, involving the same basic setup but with a few extra coils and electronic circuits in both the charger and phone. The extra elements make the transmission coil more efficient and tune it to a magnetic field at a particular frequency, says Alex Gruzen, CEO of WiTricity, a Massachusetts Institute of Technology spinoff that is commercializing resonance charging. “Then something magical happens,” Gruzen explains. “Suddenly the source coil and receiver coil don’t have to be perfectly aligned anymore, and don’t have to be the same size.”

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