Optimal Frequency for Implantable Mid-field Wireless Power Transfer

Abstract

Mid-field wireless power transmission technology is the latest method in the development of wireless power transmission. The purpose of this paper is to study the effects of tissue type, position offset, deflection angle and coil size on the optimal frequency of implantable mid-field wireless power transmission. In this study, the multi-layer organization model is taken as the main research object, and a transmission model with transmitting and receiving coils is established by using COMSOL Multiphysics finite element simulation software. The frequency of the system with the best transmission coefficient in various cases is calculated, and the influence of various factors on the optimal frequency is judged. The results show that the tissue type, position offset and angle deflection do not change the optimal frequency of the transmission system. But when the diameter of the transmitting antenna increases from 20 mm to 30 mm, the optimal frequency decreases from 2.06 GHz to 1.35 GHz.