Adaptive Gating Multiple Antennas RFID System Based On Target Perception

RFID technology is one of the most competitive information management technologies in the21st century. It has ideal application effect in logistics, finance, product traceability, vehicle positioning, and library and so on. So it makes the management level of the enterprise ascend a big step.RFID systems with multiple antennas can be used in intelligent recognition of combat readiness medicine cabinet which is small but need different directions recognition. RFID systems with multiple antennas also used in objects positioning system like robot positioning, vehicle positioning and books positioning. In multiple antenna systems, when one antenna emerge performance degradation or even stop working, other antenna can work as usual. Multiple antennas can enhance the risk resistance performance of the system. Compared with the multiple antennas system based on multiple reader, a single reader drive multiple antennas RFID system put forward by this paper cost much less and connect more simple. In addition, this system can adaptively aware the target label’s closing through joining holzer switch module. This technique can achieve low power consumption features of system. When there is no target, system can be in a low power state. Until the holzer switch recognize the target closing to wake up system to work.Paper first introduces the RFID system. Then it introduces multiple antenna RFID system with adaptive perception. Combination of working principle of system paper designs the overall scheme. The hardware circuit design of system includes minimum system of the host controller, reader module, multiple antenna gating module, antennas with holzer switches, serial port communication module and memory module. The software circuit design of system includes reader register setting, communication between reader and transponder, finding card,the collision procedure, reading and writing the CARDS, CRC checking, key verification, adaptive gating and three kinds of communication including UART, SPI and I2C.The innovation of this system is that a single reader device can drive multiple antennas and system achieves adaptive gating with holzer switches. In practical application, it is easy to use with low power consumption, small size and strong function.