Design And Research Of New Generation RFID Reader

With the continuous development of electronic communication technology,people are gradually entering the era of the Internet of Everything.The interconnection of things and things,that is,the development of Internet of Things technology,makes RFID technology as one of its key technologies have broader application prospects.In order to adapt to a wider range of application scenarios,such as warehouse logistics management that requires a wide range of identification tags,it is necessary to study higher-performance RFID readers.Based on the EPC Global UHF C1G2 standard,this paper studies and designs a new generation of RFID reader with a working frequency range of 902MHz～928MHz,which can identify tags at a long distance and has a high reading success rate.The main work of this paper includes:1.The system scheme of the new generation of RFID reader is determined.The reader is divided into antenna,baseband control module,RF front-end module and carrier cancellation module.The antenna adopts diversity technology to improve the success rate of tag reading and writing.The baseband control module adopts the framework combining high-performance MCU and FPGA.The receiver in the RF front-end module adopts a zero-IF compatible superheterodyne architecture to improve the cancellation completion judgment accuracy.The carrier cancellation module uses vector modulation and single-ended reflection circuit,which can suppress the carrier leakage of the RFID system,improve the sensitivity of the receiver,and increase the tag reading distance of the reader.According to the scheme design,the chip selection of each module is completed,and the link budget of the overall transceiver system link is carried out according to the data sheet of each chip.2.The design and implementation of the RF front-end module and the carrier cancellation module of the RFID reader are completed.It mainly includes schematic design,PCB layout drawing,and structural design.3.The hardware control software of a new generation of RFID readers is completed,including the underlying software driver of each chip of the link,and the program control software of the host computer of the entire system.4.The debugging and link parameter test of the RFID reader have been completed.The test results show that the RF front-end module can work stably for a long time and the control function of the host computer is reliable,and the indicators meet the requirements of longdistance reading and writing of tags.The new generation of RFID reader designed in this paper can adapt to a wide range of tag identification,and can be program controlled by the host computer to grasp the link parameters,which provides a basis for subsequent related research.