Research Of Dual-frequency Long-distance Reader System Based On ARM

Radio frequency identification(RFID)is one technology of automatic Identification,which is used with the coupling of radio magnetic filed to realize contactless communication and identify the items.Along with the rapid development of microelectronics technology,the application of radio frequency identification technology growing areas,has been successfully applied in industry,transport and daily life,and many other aspects.Papers subject with the support of schools and teachers,into the Tsinghua Microelectronics,Ecore- Tech Co.Ltd "the LF & HF bands - remote dual-band passive RFID System" research work.We designed the system uses low-frequency (LF,main frequency of 125KHz)carrier as remote dual-band passive card of energy supply.uses high-frequency(HF,main frequency of 13.56MHz)carrier as a dual-band card reader to send and receive signals.Papers on the dual-band card reader the basic working principle and its characteristics,analysis of the ARM microprocessor-based hardware platform development environment.At the same time,also discussed the research in the use of the antenna technology,data transformation and the basic coding technology.Papers from the hardware design and software development discussed the long-distance contact-less dual-frequency reader design principle,system solutions and technical implementation details.Research on the use of EM4094 chip as a high frequency "Power signal" transfer the basic electronic circuit module,supported by different external circuit and the corresponding software,system to meet the needs of different applications.As equipment design small and low power requirements, prompt us to explore ARM technology to maximize the advantages of real-time and high-speed,Research results"Long-distance Dual-frequency reader System" better to complete the project's technical indicators.With this ARM-based microprocessors,such as dual-frequency reader in the electronic tax system,bus identification and tracking system,intermodal container identification system,goods identification and tracking system,security and access control systems,and other areas of the extensive application,the technology will be further developed...