IMPROVED RF TAGGING SYSTEM WITH MULTIPLE DECODING MODALITIES

摘要

An RF tagging system including an RF tag (10, 30) and an RF tag reader (80). The RF tag includes a plurality of RF resonant circuits. Each RF resonant circuit is resonant at a different specific frequency. Each plurality of RF resonant circuits divided into a group of decoder circuits (12, 32) and a group of data RF circuits (14, 34). The group of data RF circuits have resonant frequencies corresponding to a predetermined identification code when the resonant frequencies of the data RF circuits are decoded in accordance to the one decoding modality. The RF tag reader detects the resonant frequencies of the decoder RF circuits to determine the one decoding modality. The RF tag reader is operative in each of the predetermined decoding modality. The decoder RF resonant circuits may also indicate the number of data RF resonant circuits on the RF tag. The RF tag reader determines the number of RF circuits from the decoder RF resonant circuits to confirm the accurate detection of the data RF resonant circuits.