2.45GHz Passive RFID Reader RF Front-end Design And Implementation

Radio Frequency Identification (RFID) technology is a way in the use of radio frequency RFID reader and non-contact between the two-way data transmission, to achieve the target identification and data exchange purpose of the automatic identification technology. Because of non-contact, long distance work, suitable for harsh environment, the advantages of moving target identification, RFID technology has been widely used in industrial automation, business automation, transportation control and management, and other fields. RFID technology on a new technology application, it not only covers the radio frequency technology, also includes cryptography, communications theory and semiconductor integrated circuit technology, is a multidisciplinary integrated emerging disciplines, with broad prospects. RFID technology and the rapid development in foreign access to a wide range of applications, while domestic radio frequency identification technology development and research has just started. In order to meet the current needs of the information society to all kinds of information access and handling rapid, accurate and safety requirements, the issue from the application point of view, a 2.45 GHz passive radio frequency identification readers front-end RF Circuit Design and Implementation.The first topic in-depth analysis of the radio frequency identification technology-related theories and key technologies on the basis of overall design of a passive radio frequency identification readers front-end RF circuit, given the passive radio frequency identification readers RF front-end structure of the circuit And to read and write from the calculation carried out a detailed analysis. Si4136 and the use of the C8051 to achieve the 2.45 GHz frequency of the vibration signals. ASK ADG918 used to achieve amplitude modulation to send data to the modulation, transmitting power to 1 W (30dB); circuit used to receive zero-IF receiver, demodulator way for the quadrature demodulation, such demodulator means strong anti-interference capability; launch Circuit and receiving circuit between the use of Central Bank is to achieve the same frequency transceiver signal isolation; tags and readers through the backscatter modulation means to read and write communication. This issue designed by 2.45 GHz passive radio frequency identification readers front-end RF tags can be achieved and the communication distance of 15 cm.