Compact Energy Harvesting System for Electronic Devices in Internet-of-Things

A compact omnidirectional and multi-beam energy harvester working at 2.45 GHz is presented. This proposed energy harvester consists of three Quasi-Yagi antennas to achieve an omnidirectional radiation pattern with multiple beams. The structure of proposed Quasi-Yagi antenna has the capability to tune the antenna impedance to conjugate match with the rectifier input impedance. This proposed energy harvester is low-profile and compact without impedance matching circuits, which can be applied for powering small electronic devices in the Internet of Things applications.