Researchers report that lab tests of a new metasurface-based antenna that can harvest 100 microwatts of power, enough to power simple devices, from low power radio waves. This represents an important ...

Engineers have designed the first battery-free cellphone that can send and receive calls using only a few microwatts of power, which it harvests from ambient radio signals or light. It's a major step ...

Most of the devices and sensors connecting to the Internet of Things (IoT) rely on transmitting radio waves to communicate, which requires power, which means batteries if mains power isn't an option.

At CES, we saw Samsung show off a TV remote that powers itself with nearby wireless waves, eliminating the need to even have a battery. While our own A/V Editor Phil Nickinson is skeptical about the ...

A team of researchers from Stanford University and the University of California, Berkeley, has created prototype radio-on-a-chip communications devices that are powered by ambient radio waves.

Seemingly every connected device has at least one wireless radio in it. However, that often requires some big compromises. Those radios often chew up a lot of power, which isn't always practical with ...

Researchers have demonstrated the potential for IoT devices to ditch power-draining radio sensors and instead communicate using background radio waves from TV, radio and mobile phones. The emergence ...

Abstract: Traditional active radars transmit a powerful electromagnetic pulse and record the echo's delay time and power to measure target properties of interest, such as range, velocity, and ...