Dual-Band Wi-Fi Energy Harvester toward Indoor Autonomous IoT Devices

Abstract

In this paper, a novel dual-band Wi-Fi energy harvester based on a human-ring-shaped multi-band antenna and a dual-band rectifier for indoor autonomous IoT devices is presented. The dual-band and compact rectenna harvests energy from a Wi-Fi source with the measured efficiency of 30% at 2.45 GHz (input power of −4.6 dBm) and 7% at 5.5 GHz (input power of −6.8 dBm), respectively. The multi-band antenna has a quasi-omnidirectional radiation pattern to receive energy from multi-direction for the real application. This renewable energy solution is potential for self-powered indoor IoT device.