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has been cited by the following article:

• TITLE: Wireless Power Feeding with Strongly Coupled Magnetic Resonance for a Flying Object

  AUTHORS: Masayoshi Koizumi, Kimiya Komurasaki, Yoshihiro Mizuno, Yoshihiro Arakawa

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

  JOURNAL NAME: Wireless Engineering and Technology, Vol.3 No.2, April 28, 2012

  ABSTRACT: 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.