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Flight time of micro-UAVs is limited by the battery size they can carry. Typically, they need to land and recharged after about 10 minutes. This paper presents a method for wirelessly charging the UAV battery when it lands, without the need to remove it and replace it. The system consists of a light-weight flexible rectenna array mounted on the UAV body and micro-controller driven power management circuit that enables efficient battery charging. In this work, a frequency of 5.9GHz is chosen as a compromise between size and rectifier efficiency. The UAV battery is charged from the edge of the far field with about 5W of transmit power.
Dunbar et al. (Fri,) studied this question.
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