Design And Research Of Flexible UHF Anti-Metal Tag Antenna

With the rapid development of science and technology,mankind entered the information age,Internet of things technology has been developed,rfid technology is based in the Internet of things technology.RFID technology is widely used because of its advantages such as fast reading speed,contactless information transmission,and the ability to work in harsh environments.Radio frequency identification technology,influence the properties of rfid tag antenna design is a key factor,resistance to metal label to label also can work normally in the metal environment designed by a special antenna,but in the actual use of usually only attached with a metal tag antenna in the flat surface of the metal,has some limitations in the process of application.In view of the above problems,this paper designs a flexible anti-metal tag antenna,which can make the tag antenna attached to the curved surface of the metal object and work normally.The main research contents of this paper are as follows:Firstly,the influence of the impedance matching of the tag antenna on the system performance is analyzed from a theoretical point of view,and the impedance matching methods of the common tag antenna are compared.the microstrip patch structure is selected to design the antenna and the equivalent circuit diagram of the microstrip antenna is established to analyze the tag antenna.The structure size of the antenna is preliminarily obtained through the theoretical calculation formula of the miscrostrip antenna.Secondly,the size of the tag antenna is further optimized by using the simulation software,and the influence of the size of the tag antenna on return loss value,input impedance,resonant frequency and other performance of the antenna is observed,and finally determine the structure size of the tag antenna.Finally,by analyzing the reason for the performance degradation of the tag antenna when it is bent,the common dipole patch antenna is conformally designed to study the effect of tag antenna bending on the performance.In the experimental simulation,it is found that the resonant frequency of the conformal patch dipole antenna and the antimetal tag antenna will shift.In order to solve this problem,a laminated structure is used to optimize the anti-metal tag antenna.Therefore,in the case of ensuring that the antimetal performance does not have a great impact,the laminated structure design is selected to design the structure of the metal label.Since the thickness of the 1.6mm dielectric board is large and difficult to bend,according to the calculation of the equivalent dielectric material formula,the composite material of 0.4mm FR4 epoxy resin board and1.2mm thick PVC plastic board is used as the dielectric substrate of the flexible anti-metal tag antenna.After actual measurement,the optimized and improved anti-metal tag antenna can still work normally on curved metal surfaces.At the same time,the performance of the flexible UHF anti-metal tag antenna designed in this paper is compared with that of the same type of flexible anti-metal tag antenna.