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TunnelScatter: Low Power Communication for Sensor Tags using Tunnel Diodes
Due to extremely low power consumption, backscatter has become the trans...
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Simplifying Backscatter Deployment: Full-Duplex LoRa Backscatter
Due to the practical challenges in the deployment of existing half-duple...
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A Comparative Survey on Silicon Based and Surface Acoustic Wave (SAW)-Based RFID Tags: Potentials, Challenges, and Future Directions
Many Automatic Identification (Auto-ID) technologies such as bar codes, ...
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Long Range Communication on Batteryless Devices
Bulk of the existing Wireless Sensor Network (WSN) nodes are usually bat...
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Self-powered sensors enabled by wide-bandgap perovskite indoor photovoltaic cells
We present a new approach to ubiquitous sensing for indoor applications,...
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Super Low Resolution RF Powered Accelerometers for Alerting on Hospitalized Patient Bed Exits
Falls have serious consequences and are prevalent in acute hospitals and...
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An RSSI-based Wireless Sensor Node Localisation using Trilateration and Multilateration Methods for Outdoor Environment
Localisation can be defined as estimating or finding a position of the n...
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Long range battery-less PV-powered RFID tag sensors
Communication range in passive Radio-Frequency Identification (RFID) front-end devices is a critical barrier in the real-world implementation of this low-cost technology. Purely passive RFID tags power up by harvesting the limited RF energy transmitted by the interrogator, and communicate by backscattering the incident signal. This mode of communication keeps manufacturing costs below a few cents per tag, but the limited power available at the tag undermines long-range deployment. In this paper, we present an approach to use Photovoltaics (PV) to augment the available energy at the tag to improve read range and sensing capabilities. We provide this extra-energy to the RFID integrated circuit (IC) using minimum additional electronics yet enabling persistent sensor-data acquisition. Current and emerging thin-film PV technologies have significant potential for being very low-cost, hence eliminating the barrier for implementation and making of PV-RFID wireless sensors. We reduce the long-range PV-RFID idea to practice by creating functional prototypes of i) a wireless building environment sensor to monitor temperature, and ii) an embedded tracker to find lost golf balls. The read range of PV-RFID is enhanced 8 times compared to conventional passive devices. In addition, the PV-RFID tags persistently transmit large volumes of sensor data (>0.14 million measurements per day) without using batteries. For communication range and energy persistence, we observe good agreement between calculated estimates and experimental results. We have also identified avenues for future research to develop low-cost PV-RFID devices for wireless sensing in the midst of the other competitive wireless technologies such as Bluetooth, Zigbee, Long Range (LoRa) backscatter etc.
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