Patent ID: 8508076
Filing Date: 2013-08-13
Classification: H02J

Abstract:
1. A wireless power transmission unit comprising: an oscillator for converting DC energy into RF energy having a frequency f a first antenna for transmitting the RF energy, the first antenna including a first inductor and a first capacitor that are connected together in series to form a series resonant circuit with a resonant frequency fT; and a second antenna for receiving, by resonant magnetic coupling, at least a part of the RF energy that has been transmitted by the first antenna, the second antenna including a second inductor and a second capacitor that are connected in parallel with each other to form a parallel resonant circuit with a resonant frequency fR, wherein the resonant frequencies fT and fR are set to be substantially equal to the frequency f the oscillator has a voltage step-up ratio Voc, the first inductor has an inductance L the second inductor has an inductance L the second inductor is coupled with the first inductor by a resonant magnetic field at a coupling coefficient k which is set to be less than 0.5, and the power transmission unit satisfies (L