Calculation of read distance in passive backscatter RFID systems and application

One of the obstacles to wide adapt passive RFID systems is the limited read distance or relatively high error rate due to radio interferences in the passive backscatter RFID systems. The most important tag performance characteristic is read distance at which RFID reader can detect the backscattered signal from the tag. The read distance in passive backscatter RFID systems depends on many factors. This paper presented an overview of passive backscatter RFID systems and the transmission model of these systems. We focus on presenting the calculation formula of the read distance and an application system is designed based on the calculation formula. The application system is used to verify the calculation formula and experimental results show the efficiency in the end.