Full-wave analysis of non-radiative wireless power transmission system in half space

This article studies the property of wireless power transmission (WPT) system by electromagnetic full-wave simulation method when half-space condition is considered. Specially, the Time Domain Integral Equation (TDIE) is applied in this simulation. With this time domain method, the WPT without the ground is analyzed and compared with the traditional method, which has demonstrated the validity and high efficiency of this simulation method. After that, TDIE is applied to analysis the impact of infinite ground to the performance of WPT system which is a common situation when the WPT system is applied. The simulation results demonstrate that the ground will increase the resonant frequency and decrease the efficiency seriously. Besides, the ground will also bring along the split of resonant frequency in the traditional under coupled area.