http://www.qualcomm.com/media/releases/2010/02/12/qualcomm-demonstrates-evolution-wireless-mobile-computing-applications-and

has been cited by the following article:

• TITLE: Demonstration of Automatic Impedance-Matching and Constant Power Feeding to and Electric Helicopter via Magnetic Resonance Coupling

  AUTHORS: Masato Yamakawa, Kohei Shimamura, Kimiya Komurasaki, Hiroyuki Koizumi

  KEYWORDS: Wireless Power Transfer, Power Regulation, Resonator, Flying Object

  JOURNAL NAME: Wireless Engineering and Technology, Vol.5 No.3, July 11, 2014

  ABSTRACT: Wireless power transfer (WPT) from a transmitter resonator on the ground to an electrically powered miniature heli-copter was attempted to demonstrate WPT using magnetic resonance coupling to an object moving in 3D space. The transmission efficiency was optimized by automatic impedance matching for different flight attitudes: a maximum flight altitude of 590 mm was achieved. Furthermore, an estimation method of transmission efficiency using only the properties on the transmitter side was proposed, with transmission power regulated as constant against the change in the coupling coefficient.