The Simulation Research Of Microwave Energy Receiver Based On Metamaterial Absorber

Microwave wireless energy transmission technology has extremely important application value in the wireless power supply of sensor network nodes,the wireless power transmission of solar space stations to the ground,and the wireless power supply of unmanned aircraft.In the microwave wireless energy transmission technology,the performance of the electromagnetic energy receiving antenna plays a vital role in the working efficiency of the entire microwave wireless energy transmission system.Traditional electromagnetic energy receiving antennas have problems such as large size,low efficiency,narrow receiving bandwidth,polarization stability,and poor incident angle stability.The research of metamaterial electromagnetic energy receivers provides a new way to solve these problems.At present,the research of metamaterial electromagnetic energy receiver is still in the initial stage.Although it has achieved high working efficiency,its working bandwidth is relatively narrow.Moreover,a metamaterial electromagnetic energy receiver that can perform well on multiple performance indicators at the same time remains to be studied.Therefore,this paper has carried out research on the above problems and proposed a design idea of a metamaterial electromagnetic energy receiver.Three kinds of wideband metamaterial electromagnetic energy receivers with excellent performance have been designed.The mechanism analysis and rule summary are also carried out to provide references for future research on metamaterial electromagnetic energy receivers adapted to complex environments.The main research contents of this paper are as follows:(1)This paper presents a method of a metamaterial electromagnetic energy receiver,and uses the equivalent circuit analysis method to derive the formula to give the internal structural factors that affect its resonance frequency and working efficiency.(2)A structure of wideband metamaterial electromagnetic energy receiver has been proposed.The influence of the size parameters of the metal pattern,the size parameters of the dielectric substrate and the electromagnetic parameters on its work efficiency and resonance frequency has been studied.The working efficiency and resonant frequency change rules under various influencing factors have been summarized.It is found that the relative position of the metal via hole and the electromagnetic wave electric field determines the polarization form of the electromagnetic wave absorption by analyzing the influence of the position of the metal via hole.Through the analysis of the influence of the incident angle of the electromagnetic wave,it is found that the magnetic field of the electromagnetic wave has a great influence on the work efficiency,and the electric field has a great influence on the resonance frequency.(3)On the basis of the previous study of the influencing factors and the reasonable method of setting metal vias and adjusting various parameters,a polarization stability broadband metamaterial electromagnetic energy receiver has been designed.The simulation results show that under TE and TM polarized waves,the working efficiency at 5.8GHz reaches more than 98%,and the relative bandwidth corresponding to a working efficiency of more than 90% reaches more than 23.6%.In addition,through simulation analysis,the metamaterial electromagnetic energy receiver has strong polarization stability and wide incident angle characteristics,as well as strong load characteristics.(4)A method of combining a hollow metal cylinder and a rotationally symmetric structure is proposed to design an ultra-wideband metamaterial electromagnetic energy receiver.It has a thin dielectric substrate,and the simulation results show that it has polarization stability and good wide incident angle characteristics.