Wide-Power-Range RF Harvester with Constant Output Voltage for Autonomous Sensing Systems

A self-powered senor node is enabled by radio frequency (RF) power harvester (RFPH) with extended power-range. A theoretical analysis is employed to establish the theoretical upper limits for rectifier design. The proposed RFPH effectively addresses the power range limitations caused by impedance mismatch introduced by the DC-DC converter. The proposed RFPH was verified at 1.8 GHz achieving high efficiency across a wide power range. Finally, it is experimentally demonstrated that the designed RFPH can successfully enable an energy-autonomous wireless sensor node.