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This paper studies the difference between retro-directive beamforming technique and retro-reflective beamforming technique in the context of wireless power transmission applications. In all of our studies, a wireless power receiver broadcasts continuous-wave pilot signal, the wireless power transmitter receives and analyzes the pilot signal, and finally the wireless power transmitter transmits continuous-wave...
This letter presents an experimental study on wireless power delivery to low-power mobile devices based on retro-reflective beamforming. In our scheme, a pilot signal composed of an impulse train is broadcast from a mobile device. The pilot signal is received and analyzed by a wireless charger that includes four antenna elements. Then, according to the analysis outcome, the wireless charger constructs...
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