RF energy harvester design with autonomously adaptive impedance matching network based on auxiliary charge-pump rectifier

This paper presents an implementation of a radio frequency wave energy harvester with the capability of self-adjusting the matching network to adapt to changing load conditions. An auxiliary charge-pump is designed to supply the power for the supplemental control unit. The design is implemented in a standard 0.13-μm CMOS process. The results show that the power transfer efficiency with using the proposed design can achieve a level of over 70% independent of the load conditions.