13.56 MHz 射頻辨識系統之實現

Abstract

This thesis implements a 13.56 MHz passive RFID system using the 13.56 MHz Melexis MLX90121 RFID reader transceiver IC and the 13.56 MHz Texas Instruments RI-I02-112A-03 transponder. The major research topics include the ISO 15693 standard, data packet format, communication protocol, baseband coding, and so on. An RFID system comprises a reader and a transponder, which finds numerous applications due to its high data density, fast reading speed, good machine readability, no influence of dirt, and low possibility of unauthorized copying/modification. The 13.56 MHz passive RFID system investigated in this thesis is based on inductive energy coupling and signal transfer between the reader and transponder in the near-field region. Since the 13.56 MHz coil antenna and impedance matching circuit have critical effect on wireless energy transfer and communication range, the design methods for the coil antenna and matching circuit are also discussed in detail. In order to facilitate proper wireless communications between MLX90121 reader transceiver IC and RI-I02-112A-03 transponder, the Microchip PIC16LF877A microcontroller and its 35 PIC16 assembly language instructions are utilized to set the contents of configuration registers of MLX90121. Lastly, the communication reliability and range of the 13.56 MHz passive RFID system implemented are tested in open sites.