Leveraging UAVs for Passive RF Charging and Ultra-low-power Wake-Up of Ground Sensors

In this letter, we design and implement a radio frequency (RF) energy harvesting and wake-up system that scavenges a 2.4-GHz signal from an unmanned aerial vehicle (UAV). The signal transmitted by the UAV is harvested and rectified to dc voltage to power a sensor on the ground. Additionally, the UAV modulates the transmitted signal to encode an address that triggers a particular sensor from sleep ...