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A research team led by the National University of Singapore has made a significant advance in energy harvesting technology, which could potentially eliminate the need for batteries in a variety of electronic devices.
They developed a new type of rectifier that can efficiently convert ambient radio frequency signals, which are typically considered “waste” energy, into usable DC voltage. For example, this technology converts ambient radio frequency signals from sources such as Wi-Fi and cellular networks into usable electrical energy.
“RF energy harvesting technologies such as this are important because they reduce battery dependency, extend device life, minimize environmental impact, and enhance the use of wireless sensor networks and Internet of Things devices in remote areas where frequent battery replacement is impractical,” the developers say.
The research demonstrated the feasibility of using nanoscale rectifiers to achieve this conversion. This was even possible at low RF power levels below -20 dBm. This was achieved by optimizing the rectifiers and integrating an array of such rectifiers into an energy harvesting module. The harvested energy (at RF power below -20 dBm) was sufficient to power LEDs and a commercial temperature sensor. An array of 10 optimized rectifiers achieved an impressive 7.8% efficiency and high sensitivity.
The research team is now focusing on integrating an on-chip antenna to further improve the efficiency and compactness of their technology. The researchers are also exploring series-parallel and on-chip interconnects to improve RF power harvesting, with the potential to generate enough voltage to eliminate the need for a DC amplifier.
Source: interestingengineering
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