Research On Read Range And Optimization Of RFID Antenna Based On COMSOL

RFID technology is one of the core technologies for information and intelligence in the 21 st century.RFID system can bring enough convenience to people's production and life,and its antenna plays a direct role in information transmission and information reception.RFID antenna is a common device in daily life,which can meet the requirements of low energy consumption,high efficiency,fast and convenient.Although the development technology and development type of RFID winding antenna are basically mature,the requirements for winding antenna are still relatively high.Therefore,the optimized coil antenna will allow people who apply the corresponding system to have a better life experience.In the calculation of electromagnetic field problems,the inverse problem and the optimization design of the engineering electromagnetic field are relatively difficult problems.For the electromagnetic field inverse problem of the single objective function class,we can directly introduce the optimized variables into the modeling process.For the electromagnetic field inverse problem of the mult-objective function class,we can only get non-explicit solutions.If we want to strike a balance between these basic issues,we need to calculate them.On this basis,the conclusion is obtained by modeling,calculating and optimizing the cosolvent.The structure paper did three studies:In the first part,we study the application of passive radio frequency identification antenna in the project of close monitoring system promotion in Shuozhou,Shanxi province,and the application of user feedback.According to Stokes 'theorem,Biot-Savart Law,effective signal receiving measurement rules and literature,the wound RFID coil antenna was modeled in phase.Optimization of the RFID coil antenna for the AH-TG100VK1 access control system was carried out.The problem of the short reading distance of the RFID system was solved,and the reading distance was increased from 2.5 cm to 8.5 cm.Access to the system has been facilitated for the population..The second is to use a single antenna structure as a unit model to simulate the far field electric field mode of such antennas,calculate the reading range,and draw a direction map.The characteristics of RFID antenna were studied.The impedance optimization matching of the frequency 6.5 gigahertz electromagnetic wave is realized,and the performance of the antenna is improved.Solved the problem of insufficient response when this antenna works.At the same time,the equivalent substitution method is used to calculate the range of RFID reading using Fu's equation and D'alembert solution.This calculation method can be used for the study of simulated scattering field in the method of electromagnetic wave propagation parabolic equationThirdly,for the special advantages of Bessel function,a helical phase plate of helical electromagnetic wave set and RFID antenna which can use Bessel function is designed.The electric field of RFID antenna that produces Bessel function wave converges in a small cylindrical cavity,which effectively inhibits the scattering of electric field energy.