This letter demonstrates a wireless power transmission scheme based on distributed retro‐reflective beamforming experimentally. The wireless power transmitter, which includes eight antennas distributed in space, receives pilot signals from a mobile device and then focuses radio frequency power onto the device's location through analyzing the pilot signals. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1873–1876, 2015

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This paper presents an experimental study on wireless power delivery to low-power mobile devices based on retroreflective beamforming. In our scheme, a pilot signal comprised of an impulse train is broadcasted from a mobile device. The wireless charger analyzes the received pilot signal, and then accordingly constructs a focused power beam onto the mobile device. In our experiments, 14 mW out of the 1 Watt power transmitted from the charger is harvested by the mobile device 50-cm distance away, and the power beam is capable of tracking the device's location dynamically. In addition, since the pilot signal's spectrum covers a certain frequency range, the carrier of wireless power can be configured among multiple frequencies.

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