A Fast-Beamforming Technique for Blind-Adaptive Wireless Power Transfer towards Free-Flying Insects

A free-flying insect is usually adopted to study the bio-signals for bionics. As an insect is not able to carry a large battery, far-field wireless power transfer (WPT) is required to maintain the uninterrupted operating. Conventional beamforming WPT technique can easily focus the power from a transmitting (Tx) array to a stationary receiving (Rx) target, while it takes a long time to reform the power beams towards a fast-flying insect. In this paper, we propose a fast-beamforming WPT technique to shorten the time duration of the blind-adaptive WPT. Instead of the constant perturbation factor in conventional beamforming WPT, our WPT system dynamically adjusts the perturbation factor during the powering-up process, which can achieve the optimized weight vector of the Tx power in a much shorter time. The proposed technique is compared with the conventional far-field blind-adaptive beamforming WPT, and the results indicate the reduction on the powering-up time towards a free-flying insect.