Realization Of C-band Indoor Wireless Power Transmission Array

Array antenna refers to the same antenna array elements arranged in accordance with a specific law to form an antenna array.Compared with the single array element,array antenna can achieve higher gain,more optimized pattern and controllable radiation direction.In the application,the array antenna can control the radiation characteristics by adjusting the transmission signal characteristics of each unit,and can produce focusing effect at a specific position,which is suitable for the design of wireless power transmission system.At present,there are many researches on wireless power transmission in outdoor space,and many scientific research achievements have been put into application.However,the main scene of people's life and work is indoor,and the technology of wireless power transmission in a certain distance in the indoor environment is relatively less.Therefore,this paper mainly takes the realization of indoor wireless power transmission array of C-band as the research purpose,and the main research contents are as follows:1.Simulation of indoor phased array focusing.In order to simulate and analyze the indoor channel,a algorithm is proposed.This channel algorithm is designed according to the mirror image method.This algorithm can show the radiation path of electromagnetic wave in the room.Moreover,it can be used to analyze the channel characteristics of the channel environment.Then,the focusing effect of the array antenna is simulated.Firstly,according to the existing theoretical basis,the focusing algorithm is designed to obtain the focusing simulation results of the array antenna in free space.Then,combined with the channel algorithm,the focusing effect in multipath environment is simulated to simulate the indoor environment with multipath effect.Considering that the charging device may move,an algorithm is designed to solve this problem.And the dynamic focusing algorithm is simulated.However,if the device moves very fast,the Doppler effect will have a great impact.Therefore,the Doppler effect is analyzed theoretically,and the phase difference caused by Doppler effect is deduced.In high-speed power focusing,it is necessary to compensate the phase difference to get a better focusing effect.The simulation analysis of this derivation result is also carried out.2.Realization of indoor wireless power transmission array.Firstly,the system architecture of indoor wireless power transmission system is analyzed.After the comparison between MCU and FPGA,FPGA is used to realize the control circuit of the system,and its functions are analyzed.Then,according to the functions to be implemented,the resources needed are estimated,and the appropriate chip is selected for subsequent design.After that,the relevant circuit and program of the selected chip are designed,so that it can complete the function of phase calculation and phase output.Finally,the timing simulation of the program module is carried out,and the control principle of FPGA to phase shifter is studied and analyzed.