| In recent years,more and more researchers involved in the wireless power transmission(WPT)technology research aims to expand the application of WPT system and improve the WPT system’s performance.This paper studied the mid-range magnetic resonant coupling wireless energy transmission technique,designed three types of electrically small antenna.And then designed a new type of metamaterial whose magnetic permeability and dielectric constant are both negative applied to magnetic coupling wireless energy transmission system to enhance the power transfer efficiency.Results in this thesis can be summarized as follows.1.Studied the work mechanism of the wireless power transmission system.Further studied the magnetic coupling resonance technique applied to mid-range wireless energy transmission system.According to the design theory of WPT electrically small antenna,we designed a type of spherical electrically small antenna which applied spherical structure and used multi-arm.When the transmission distance is 80 cm,the PTE is up to 91%.2.Designed a new type of cylinder helical antenna.The train of thought of the design is: one arm → two arm → two arm+metal hat → two arm+metal hat+ferrite.Finally,we achieved 85% PTE at the distance of 2.5m(6.25 times of the antenna’s size).3.According to the four coil type WPT system and WPT electrically small antenna design theory,we designed a novel electrical small spiral antenna.The working frequency is 13.56 MHz,realize miniaturization,low frequency,high efficiency wireless power transmitting.Finally,the proposed antenna was processing and testing in a measurement system,and the results between the simulation and measurement are basically identical.4.Studied the magnetic properties and application of EBG(Electromagnetic Band Gap)/FSS(Frequency Selected Surface)and LHM(Left Hand Material).Further studied the basic principle of LHM metamaterial to achieve negative permeability and negative permittivity.Then we researched LHM applied to wireless power transfer system to improve the system’s efficiency and to optimize system performance.Designed a new typeof periodic LHM metamaterial whose permittivity and permeability are both negative,and working frequency is 13.56 MHz.And through experiment verified it can improve WPT system’s performance in a great degree. |
