Three-dimensional Negative Magnetic Metamaterial Structure Design And Its Application In Wireless Power Energy Transmission

Because of its advantages of safety,reliability,flexibility,and all-weather work,wireless power transmission technology is receiving widespread attention and research.Magnetic coupling resonant wireless power transmission is a hotspot in the research of wireless power transmission technology by coupling magnetic fields and transmitting electrical energy through resonance.However,as the transmission distance increases,its transmission efficiency will rapidly decrease.In this context,this paper studies the role of electromagnetic metamaterials in magnetically coupled resonant wireless power transmission systems,designs and uses negative permeability metamaterials to adjust the electromagnetic field distribution,and achieve the purpose of improving transmission efficiency.First,this paper establishes the equivalent circuit model of the transmitting and receiving coils and the wireless power transmission system,deduces the calculation formula of the compensation capacitance of the basic topology circuit structure,and the relationship between the value of the reflected impedance and the resonance condition of the circuit,and selects the string-string The topology circuit structure models the transmission power and efficiency of the system,and analyzes the influence of the transmission distance of electric power on the transmission efficiency.Secondly,this paper studies the method of deriving the electromagnetic parameter tensor of anisotropic dielectric materials based on the theory of optical transformation,and according to the theory of optical transformation,the equivalent displacement effect of the metamaterial medium on the excitation source is verified by simulation,thus proving Metamaterial medium can extend the transmission distance of wireless power.In addition,according to the relative permeability of the resonant unit constituting the negative permeability metamaterial medium at the resonant frequency,there is a characteristic of abrupt change from positive value to negative value.Set the surface current response when the excitation ends in different directions are set to obtain the corresponding operating frequency when the medium has a negative magnetic permeability.Finally,according to the port excitation mode and the frequency range of negative permeability distribution corresponding to the effective current response obtained by simulation,the two-dimensional resonant cell structure is designed into a three-dimensional structure.And periodically arranged the mentioned structure to form an electromagnetic metamaterial medium,then designed electromagnetic metamaterial medium exhibits an effective frequency range of negative permeability.The effective operating frequency when the relative permeability is-1.2 is taken as the resonance frequency of the magnetic coupling coil,and the circuit parameters are matched.The effectiveness of the designed three-dimensional negative permeability metamaterial for improving the efficiency of wireless power transmission was verified through simulation and experiments.