Design of UHF RFID reader and the solution of crosstalk problems

This paper introduced the design and realization of UHF RFID reader system based on ARM9 microprocessor as the controller and austriamicrosystems´ UHF RFID reader IC AS3992 for the RF front-end processing. With designing of the external power amplifier circuit, the external RF power detector circuit and the reader antenna impedance matching digital tuning circuit in the hardware system, the transmitter output power level is up to +33dBm, and the receiver S/N ratio has been improved. The reader software system implemented high-speed identification of ISO/IEC18000-6C tags and multi-tags inventory anti-collision algorithms, it has also solved the existing crosstalk problems between readers in the industrial site through the IP multicast technology based on embedded Linux operating system. The design UHF RFID reader system has been already applied effectively in the RFID management system of a certain power plant vehicles, and the operation result shows that it has successfully realized purposes to identify and process the information of vehicles´ tag in the distance of 10 meters with stable performance.