Sign In

Communications of the ACM

ACM TechNews

Turning Your Living Room Into a Wireless Charging Station

A simple representation of the in-home wireless power transfer scheme.

Engineers at Duke University, the University of Washington, and Intellectual Ventures' Invention Science Fund have proposed a home system that could wirelessly charge devices within its line of sight.

Credit: Duke Today

A panel could one day remotely charge smartphones, tablets, and other devices within its line of sight, according to engineers at Duke University, the University of Washington, and Intellectual Ventures' Invention Science Fund.

The proposed system operates at much higher microwave frequencies and can transfer power beyond the confines of a single room. To maintain power transfer efficiency, the system would have to operate in the Fresnel zone, the region of an electromagnetic field that can be focused.

The flat antenna proposed by Duke professor David Smith would rely on metamaterials, or synthetic materials composed of many individual engineered cells. Smith says this approach would utilize liquid crystals and would thus be able to be manufactured at plants that produced liquid-crystal display TVs.

Researchers found a flat metamaterial device no larger than a flat-screen TV could focus beams of microwave energy within a distance of up to 10 meters and charge more than one device simultaneously.

Before the system can become a reality, a powerful, low-cost, and highly efficient electromagnetic energy source would need to be developed.

"I think building a system like this, which could be embedded in the ceiling and wirelessly charge everything in a room, is a very feasible scheme," Smith says.

From Duke Today
View Full Article


Abstracts Copyright © 2016 Information Inc., Bethesda, Maryland, USA


No entries found

Sign In for Full Access
» Forgot Password? » Create an ACM Web Account
Read CACM in a free mobile app!
Access the latest issue, plus archived issues and more
ACM Logo
  • ACM CACM apps available for iPad, iPhone and iPod Touch, and Android platforms
  • ACM Digital Library apps available for iOS, Android, and Windows devices
  • Download an app and sign in to it with your ACM Web Account
Find the app for your mobile device