Study On Some Key Problems Of RFID For Internet Of Things

As a new kind of automatic identification (Auto ID) technology, Radio Frequency Identification (RFID) has been applied in Electronic Article Surveillance Systems (EAS), Portable data capture systems and Positioning systems etc. since the 1990's. After a brief introduction of some successful applications of RFID and its operation principles, we studied the influence of tag's antenna curing on the system performance and the anti-collision for reading multi tags for the passive RFID system operating in UHF and microwave region. A prospect of the RFID being applied in the digital campus is further discussed.The phenomena of tag's antenna curing will appear for the system operating in microwave region when it is attached on the surfaces of some objects in some applications. With theoretical analysis, we find the gain and the input impedance of the antenna have significant influence on the passive RFID system performance. There are four kinds of typical half-wave dipole wire antennas widely used in microwave region were illustrated with NEC-Win. Results indicate that the arc curving of tag's antenna can degrade significantly the operating rang of the passive microwave RFID system. Therefore, antenna structures less sensitive to curving should be considered for RFID system to avoid this kind of distortion.For RFID widely used in supply chain, one problem with attempting to read multiple RFID tag with an interrogation zone of a reader is that more than one tags could be activated by the reader at the same time, so the performance of anti-collision is more important for the RFID system. In this paper, based on the analysis about the binary searching and traditional adaptive binary searching anti-collision algorithms widely used in UHF RFID system, an improved adaptive binary searching algorithm is designed concerning with system efficiency, consumer privacy, and system flexibleness. Simulation With C program and theoretical analysis show the improved adaptive binary searching algorithm is viable and has better system performance than the traditional algorithm.In addition, based on the discussion about some questions of the RFID application in the digital campus, the writer designed a intelligent library system.