Author(s)

Masayoshi Koizumi, Kimiya Komurasaki, Yoshihiro Mizuno, Yoshihiro Arakawa

Department of Advanced Energy, The University of Tokyo, Tokyo, Japan.
Department of Aeronautics and Astronautics, The University of Tokyo, Tokyo, Japan.

Wireless power feeding was examined with strongly coupled magnetic resonance for an object moving in 3-D space. Electric power was transmitted from the ground to an electrically powered toy helicopter in the air. A lightweight receiver resonator was developed using copper foil. High Q of greater than 200 was obtained. One-side impedance matching the transmitter side was proposed to cope with high transmission efficiency and the receiver’s weight reduction. Results show that the efficiency drop near the ground was drastically improved. Moreover, the measured efficiency showed good agreement with theoretical predictions. A fully equipped helicopter of 6.56 g weight was lifted up with source power of about 5 W to an altitude of approximately 10 cm.

Wireless Power Transmission; Coupling Coefficient; Impedance Matching; Quality Factor; Resonator

M. Koizumi, K. Komurasaki, Y. Mizuno and Y. Arakawa, "Wireless Power Feeding with Strongly Coupled Magnetic Resonance for a Flying Object," Wireless Engineering and Technology, Vol. 3 No. 2, 2012, pp. 86-89. doi: 10.4236/wet.2012.32014.