Performance Analysis And Optimization Design Of Multi-tag RFID System In Metal Environment

Using the RFID tag's non-contact reading and writing features,RFID electronic tags are attached to assets,which not only facilitates the management,but also reduces the workload of related staff,and saves a lot of manpower and material resources.However,due to the technical limitations of RFID and the complexity of its application,new requirements and challenges have been brought to the performance research and design of RFID systems.Based on the above-mentioned status,and applying related theories of electromagnetic fields,tests,and antennas,this dissertation studies the communication links,performance analysis,and design of multi-tag RFID systems in a metal environment.The main contents and tasks include:Firstly,the development of RFID technology,the basic structure of RFID systems and communication theory,analyzes the advantages of RFID technology.The influence of label timing jitter and multipath interference on link integrity in multi-label environment was studied.The full link of RFID system was modeled and analyzed.To improve the reading performance of RFID system under multi-label environment,an optimization scheme to improve the read rate is proposed from the arrangement between the electronic tag and the reader.And using experimental tests,the impact of timing jitter in the RFID system analyzed in this dissertation and the optimization program to improve the read rate were verified.The read rate of the optimized program was improved compared to the ordinary program.Secondly,the metal environment problem is studied.The forward link of the RFID system communication in metal environment is analyzed from the electromagnetic field theory.The received power and the loss of the electronic tag on the metal surface are deduced and the relationship between the loss and the distance from the electronic tag to the metal media is deduced.Using MATLAB for simulation analysis and testing on the RFID test platform.The thickness of the foamed board required between the electronic tag and the metal medium is obtained to ensure the maximum reading distance.Thirdly,several methods to solve the common half-wave dipole antenna work on the metal surface are introduced.Based on the analysis in the fourth chapter,an electronic label suitable for working on the surface of metal media is designed.Starting from the design of the microstrip antenna,the microstrip antenna design empirical formula and HFSS software are used to optimize the structural parameters of the microstrip antenna,and the optimized antenna performance is simulated and analyzed.Finally,according to the simulation analysis structure,the antenna is processed and manufactured,and its reading performance is tested.The test results are basically consistent with the theoretical analysis values.Finally,to improve the reading rate of multi-tag RFID systems in metal environments,combined with the contents of the previous chapters,the designed anti-metal tags and optimized layout schemes were used,and comparative experimental tests were conducted.The test results show that the use of anti-metal tags and optimized layout scheme,the read rate of the multi-label RFID system in the metal environment has been significantly improved.