Improved RF power harvesting circuit design

A topic of intense study in RF wireless research is that of wireless sensor networks. These devices are capable of sensing data, performing data processing, and wireless transmission to other sensor nodes. When distributed in a random fashion in an area, these sensor nodes organize themselves into a network capable of routing data back to a central access point. Wireless ad-hoc sensor networks represent a major tool with applications to disaster relief, the military, health care, and business. One of the fundamental challenges towards realizing this goal is that of powering such a system for long periods of time. Given that miniature battery capacity is limited, the ability to harvest energy from the environment could greatly extend the operational life of sensor nodes. Towards this goal, RF energy harvesting shows tremendous promise.To accomplish this goal, power matched Villard voltage doubler circuits are employed utilizing diode connected MOSFETs. Three circuit modifications are presented for improving the efficiency of the Villard Voltage doubler as an RF power harvesting circuit.