Boffins improve on tech that extracts DC power from ambient Wi-Fi

Series of 8 spin-torque oscillators improves efficiency, but parallel design better for wireless transmission
A research team from the National University of Singapore and Japan’s Tohoku University say they have improved on the use of spin-torque oscillators (STO) to harvest and convert Wi-Fi signals into energy through a series configuration that lit up a battery-less LED.…