Study of near field for WPT system

In this paper, the near field distributions was measured using the PCB scanner to analyze the noise source of magnetic resonance wireless power transmission system. The measured sample is transmitted by magnetic resonance using 6.78 MHz. The main noise sources are generated a lot of the harmonics of 6.78 MHz resonance frequency and internal clock signal of regulator for supplying a stabilized power. The harmonic signal is shown to be widely distributed in frequency band.