Magnetic resonant wireless power delivery for distributed sensor and wireless systems

Abstract

In this paper we report on a resonant wireless power delivery system using magnetoquasistatic fields. The system consists of a source coil impedance matched to a function generator using a resonant circuit and one or more repeater, or relay, resonant tanks that couple energy from source coil to loads distributed in the system. We experimentally map the power distribution for one and multiple loads as a function of distance from the source and repeater. We then use this information to construct a resonant wireless power delivery system using a distributed set of 4 repeaters and 6 loads, delivering 15 mW total over a distance of 6.4 ft. We also demonstrate that the distributed system is not strongly perturbed by weakly conducting obstructions, such as the human body, enabling non-line-of-sight wireless power of sensor and wireless networks.