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 ...

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 ...

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.

If you've ever been caught out with a dead phone battery in the middle of nowhere, take heart. A team of researchers from the University of Washington (UW) have developed a phone that requires no ...

IoT sensors that don’t require power sources could be coming soon. Researchers from University of California, San Diego, claim they’ve figured out how to optimize lab-based modules to such an extent ...

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 ...

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 ...

Organizations including Qualcomm and Wiliot have announced the formation of the Ambient IoT Alliance, a multi-standard ecosystem of ambient IoT manufacturers, suppliers, integrators, operators, users, ...

The no-frills battery-free phone prototype is powered by ambient radio signals or light. Mark Stone/University of Washington In 1945, a hand-carved wooden copy of the Great Seal of the United States ...

The basic design of the radio antenna hasn’t changed in a century. The antenna is usually a set of metal rods roughly half the size of the wavelength they are designed to receive. The electric field ...

(Nanowerk News) Researchers have developed a new metasurface-based antenna that represents an important step toward making it practical to harvest energy from radio waves, such as the ones used in ...