Energy-harvesting passive RFID (radio frequency identification) tags provide countless\npossibilities as so-called smart tags. Smart tags can communicate with existing RFID readers or\ninterrogators while providing a battery-less platform for internal and external sensors to enrich\navailable information about the environment and smart tag it. A reduced cost and size as well as\nan increased lifespan and durability of battery-free smart tags offer improvements in areas such as\ntransportation and product tracking. Battery-free smart tags can ideally support arbitrarily complex\nsensor measurements, but in reality energy limitations can introduce great reductions in operating\nrange and thus application range. In this work, we present an example application of a smart tag with\na passive HF (high-frequency) RFID tag IC (integrated circuit) and MEMS (micro electro-mechanical\nstructure) sensor. A standard HF RFID reader connected to a PC (personal computer) allowed the RF\n(radio frequency) field to power and communicate with the smart tag. A Kalman filter, implemented\non a PC, was used to correct and improve the raw sensor data of smart tag orientation. Measurement\nresults showed that the MEMS sensor on the smart tag could be powered for continuous operation\nand that raw smart tag orientation data could be read while in the RF field of a standard HF RFID\nreader, but at a limited range.
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