Battery-free devices harness radio waves

Researchers have developed a novel way to power small electronic devices

Spotted: Wireless technologies like Wi-Fi, Bluetooth, and 5G use radio frequency (RF) signals to keep us connected. Now, a groundbreaking prototype from a team led by the National University of Singapore (NUS) is turning the often-overlooked RF ‘waste’ signals into direct current (DC) voltage, which could potentially power small devices without batteries. Developed alongside experts from Tohoku University in Japan and the University of Messina in Italy, this innovative module could transform how we power our gadgets by harnessing the energy around us.

Current methods of capturing RF signals, known as Energy Harvesting Modules, struggle to work properly when the signals are weak. This motivated the research team to use a new technology, called nanoscale spin-rectifiers, as a better way to capture these weak signals. Unlike the old technology, the spin rectifiers’ small size and sensitivity makes them much more efficient at converting weak signals into usable energy. As a result, the team could use it to power a small light and a sensor, showcasing its potential for low-power applications such as small electronic devices or communication systems.

RF energy harvesting technology is being celebrated as a green innovation for its ability to cut down on battery dependence, lengthen device lifespans, reduce environmental impact, and make wireless sensor networks and IoT devices more practical in remote areas where changing batteries frequently is not feasible.

After creating the prototype, the researchers are now focused on advancing the technology. They aim to collaborate with industry and academic partners to drive the battery-free technology forward.

Written By: Georgia King