High-efficient Wireless Power Transfer System Integrated With Metamaterials And Applications

Magnetic resonance-coupled wireless power transmission(WPT)technology is playing an increasing important role in the field of consumer electronics,implantable biomedical,daily household equipment,new energy vehicles,etc.The two major core problems of the WPT technology are increasing the transmission distance and improving the transmission efficiency as much as possible.With the development of artificial electromagnetic metamaterials,a variety of electromagnetic metamaterials having been applied to WPT have brought new opportunities to solve the two major core issues.This dissertation discusses the wireless power transmission technology and its applications integrating with electromagnetic metamaterials.The main research of this dissertation is divided into the following aspects:1.Two different miniaturized magnetic negative(MNG)metamaterial units are proposed,which have the two different operating frequencies.The imaginary of the relative permeability of each unit is near zero to ensure the low loss insertion,and the imaginary of the relative permeability of each unit is negative to ensure the designed metamaterials can significantly improve the performance of the wireless power transfer system.2.An implantable antenna as a receive device is designed and applied in biomedical field.The antenna has features of biocompatible for safety,miniaturization for less damage to patients,the dual band property for the longer lifetime of the implantable battery and simultaneous data and power transmission.The wide band operational band is to ensure the good stability of the implantable antenna in the body.3.A simple strongly coupled magnetic resonant transmit coil is designed to establish an initial WPT system with the implantable receiving antenna.Then,A suitable array of the metamaterial units of the corresponding operating frequency is designed as a wearable device to be integrated with the initial WPT system to improve the transmission efficiency and increase the transmission distance.4.A mid-range WPT for multiple small receivers system is designed.The transfer distance of the system is two times longer than the size of transmission coil,and four times longer than the size of receiver coil.Then,the transfer efficiency can be improved by integrating with metamaterial array with WPT system.Finally,we discuss the optimum transmission efficiency in the different cases of the one transmit and multiple receivers WPT system.