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A Long-Distance RF-Powered Sensor Node with Adaptive Power Management for IoT Applications.
Matteo Pizzotti1,2, Luca Perilli3, Massimo Del Prete4
1Advanced Research Center on Electronic Systems, University of Bologna, Via Toffano 2/2, Bologna 40126, Italy. matteo.pizzotti@unibo.it.
Sensors (Basel, Switzerland)
|August 10, 2017
Summary
This study introduces a battery-less, multi-sensor platform powered by radio frequency (RF) energy harvesting. It enables self-sustained operation and wireless communication for IoT devices, even without traditional power sources.
Area of Science:
- Energy Harvesting and Wireless Sensor Networks
- Radio Frequency (RF) Power Transfer
- Internet of Things (IoT) Infrastructure
Background:
- Traditional IoT sensors often rely on batteries or limited energy scavenging methods (solar, thermal).
- Lack of consistent power hinders reliable, long-term IoT deployments, especially in remote or indoor environments.
- Existing wireless communication protocols may not be optimized for ultra-low power, self-sustained sensor nodes.
Purpose of the Study:
- To develop a self-sustained, battery-less multi-sensor platform utilizing RF energy harvesting.
- To implement a standard DASH7 wireless communication interface for seamless IoT integration.
- To demonstrate adaptive power management enabling operation at ultra-low RF power levels.
Main Methods:
- Design and optimization of a rectifying antenna (rectenna) using a nonlinear/electromagnetic co-design procedure for ultra-low power operation.
- Integration of an optimized energy-harvesting module with a nano-power DC/DC converter and maximum-power-point-tracking (MPPT).
- Development of an ultra-low power microcontroller managing sensors and wireless protocols with adaptive wake-up policies based on harvested RF power.
Main Results:
- Achieved self-sustained operation of the multi-sensor platform down to -17 dBm RF power input.
- Demonstrated reliable wireless communication up to 17 meters from a 2 W UHF carrier.
- Implemented adaptive behavior where the transmission data rate is dynamically determined by the received RF power.
Conclusions:
- The developed platform offers a novel solution for battery-less, self-sustained IoT sensor nodes powered by RF energy harvesting.
- The system showcases the feasibility of ultra-low power nano-power harvesting and adaptive power management for robust wireless sensing.
- Integration with the DASH7 protocol ensures compatibility with existing IoT infrastructure, paving the way for wider adoption.
