Scientists generate power through WiFi, raising prospect of phones without batteries

Scientists have made a huge breakthrough that allows them to convert radio signals into power. The discovery could allow for phones and other devices that don't use batteries – as well as entirely new ways of using smart technologies. Scientists in the US developed the device, known as a "rectenna", from a semiconductor just a few atoms thick. Wi-fi signals captured by an integrated antenna are transformed into a DC current suitable for electronic circuits. The device could be used to provide battery-less power for smartphones, laptops, medical devices and wearable technology, according to the US-led team.