New technology harnesses Wi-Fi and Bluetooth signals for power

Researchers have developed a new type of rectenna that can convert ambient Wi-Fi and Bluetooth signals into electricity, as detailed in a study published on July 24 in Nature Electronics. This innovative technology utilizes principles from quantum physics, specifically spintronics, to efficiently capture and convert weak electromagnetic waves into usable direct current (DC) electricity. The rectenna operates by receiving radiofrequency (RF) signals, which are typically much weaker than those used in traditional wireless power transmission. The team focused on magnetic tunnel junctions (MTJs), which consist of thin insulating layers between magnetic materials. These MTJs can respond to RF signals, allowing the rectenna to harness energy from ambient sources. The researchers successfully demonstrated the technology by powering a commercial thermometer using only minus 27 dBm of ambient RF signals, showcasing its potential for practical applications. This advancement could significantly impact the Internet of Things (IoT) landscape, as it offers a way to power small devices and sensors without relying on batteries. By capturing excess RF signals, the technology could reduce energy consumption and lower the carbon footprint associated with running wireless networks. The implications of this research extend beyond simple energy harvesting, as it opens new avenues for sustainable technology in everyday devices. In the future, the researchers aim to scale this technology for broader use, potentially transforming how we power connected devices. This could lead to a more energy-efficient ecosystem, where devices can operate autonomously without frequent battery replacements, ultimately contributing to a greener technological future.