Measuring UHF RFID tag reading for document localization

This study measured the reading reliability of UHF passive tags for Document Tracking. The main goal was verifying whether UHF RFID technology that relaxes the constraints of distance reading with respect to HF, is suitable for automating document workflow. A set of experiments was conducted using three types of commercial tags to verify how the reader´s power and the spatial arrangement of tags may impact on the reading accuracy. The tests involve both the simultaneous reading of a stack of 50 tagged single-page documents (inventory mode) and the retrieval of one of them. Results showed that while search for a single document is successful when carried out at a reasonable distance (allowing the user to move naturally without distance constraints), inventory is only successful in close proximity.