Wireless powering of single-chip systems with integrated coil and external wire-loop resonator

A procedure for inductive wireless powering of single-chip systems is presented. An integrated spiral coil is used as the power receiving component. An external resonator formed by a wire-loop inductor connected to a capacitor is placed in close proximity to the chip. The sinusoidal magnetic field generated at a distant transmitting loop is amplified by the resonator. The present approach enables delivering power in the order of tens of microwatts to a few milliwatts at distances longer than 10 cm using a frequency of 13.5 MHz. The integrated coil used here can be fabricated with any integrated circuit fabrication technology. (c) 2008 American Institute of Physics.