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13 April 2011 Wireless power feeding to mobile objects with strongly coupled resonance
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Wireless power feeding transmission is now in demand in the various fields. Electrical products of this modern age such as mobile phones, laptop monitoring sensors and electrical vehicles are spreading everywhere. Those electric device need to feed frequently because amount of consumed electric power of those devices are gradually increasing. Nonetheless content of battery show signs of leveling off. This is why it is important to develop a method of wireless power transmitting system with high efficiency. Strongly coupled magnetic resonance is the latest type of wireless power transmission technology. The main feature of this technology is the effectiveness in the mid-range that covers many attractive applications. The theory of transmitting efficiency is derived as a function of impedance ratio r and RF frequency ω.
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Masayoshi Koizumi, Kimiya Komurasaki, Yoshihiro Mizuno, Takayuki Shibata, and Kazuhiko Kano "Wireless power feeding to mobile objects with strongly coupled resonance", Proc. SPIE 7980, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2011, 79800N (13 April 2011);

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