In a breakthrough for green energy, researchers demonstrated a novel technique to efficiently convert ambient radiofrequency signals into DC voltage that can power electronic devices and sensors, enabling battery-free operation. Ubiquitous wireless technologies like Wi-Fi, Bluetooth, and 5G rely on radio frequency (RF) signals to send and receive data. A new prototype of an energy harvesting module – developed by a team led by scientists from the National University of Singapore (NUS) – can now ...