Design And Implementation Of Active RFID Tag With433MHZ

Radio Frequency Identification is recognized as one of the top ten technologies ofthe twenty-first century. Active RFID has been widely used because of its ability oflong recognition and embedding with sensors easily. Most active RFID tags areequipped with batteries which have limited energy, so the technology of active RFIDenergy management is very important in some application fields that replacing batteriesis very troublesome or even not permitted.This paper does some researches on low-power consumption technology andanti-collision technology of active RFID tags, based on deeply analyzing of thesetechnologies from domestic and overboard recent researches. The work contains:1, Radio frequency wake up technology which based on pattern code is proposedto solve the energy waste and long delay problems in active RFID system after studyingdomestic and overboard low-power consumption technology. It transforms the radiofrequency energy into electricity power, and extracts the wake-up pattern. If theextracted pattern matches the predefined one, it will generate an outer interrupt signal towake up the active tag. The advantages of this technology include long wake-updistance, short delay and ultra low power consumption.2, An advanced Collision Prediction-ALOHA algorithm which based on theprediction of collision is proposed to solve the waste of time slots when collectingactive tags after studying the active RFID anti-collision algorithm. The proposedalgorithm can improve the efficiency of the usage of time slots by skipping the collisionand empty slots when collecting tags after the pre-scan procedure.3, Design and fabricate the circuits of active RFID reader, active tag, radiofrequency wake up signal transmitter and the receiver. Some tests have done about theenergy consumption, distance of wake-up, distance of communication, and theefficiency of anti-collision. Compare the designed active RFID system with thetheoretical achievements and mature products on these characteristics. The result showsthat the designed active RFID tag has lower energy consumption, longer wake up distance and more efficient then other active RFID tags.