No-power wi-fi uses radio waves for energy

Battery-free devices that use radio waves as a power source may soon connect to the Internet!
Scientists, including one of Indian-origin, have designed a new communication system that uses radio frequency signals as a power source and reuses existing Wi-Fi infrastructure to provide Internet connectivity to these devices.
Called Wi-Fi backscatter, the technology developed by University of Washington engineers is the first that can connect battery-free devices to Wi-Fi infrastructure.
"If Internet of Things devices are going to take off, we must provide connectivity to the potentially billions of battery-free devices that will be embedded in everyday objects," said Shyam Gollakota, a UW assistant professor of computer science and engineering.

"We now have the ability to enable Wi-Fi connectivity for devices while consuming orders of magnitude less power than what Wi-Fi typically requires," said Gollakota.
The work builds upon previous research that showed how low-powered devices such as temperature sensors or wearable technology could run without batteries or cords by harnessing energy from existing radio, TV and wireless signals in the air.

This work takes that a step further by connecting each individual device to the Internet, which previously wasn't possible.
The challenge in providing Wi-Fi connectivity to these devices is that conventional, low-power Wi-Fi consumes three to four orders of magnitude more power than can be harvested in these wireless signals.

The researchers instead developed an ultra-low power tag prototype with an antenna and circuitry that can talk to Wi-Fi-enabled laptops or smartphones while consuming negligible power.
These tags work by essentially "looking" for Wi-Fi signals moving between the router and a laptop or smartphone.
They encode data by either reflecting or not reflecting the Wi-Fi router's signals, slightly changing the wireless signal.
Wi-Fi-enabled devices like laptops and smartphones would detect these minute changes and receive data from the tag.
In this way, your smart watch could download emails or offload your workout data onto a Google spreadsheet.
"You might think, how could this possibly work when you have a low-power device making such a tiny change in the wireless signal? But the point is, if you're looking for specific patterns, you can find it among all the other Wi-Fi reflections in an environment," said co-author Joshua Smith, a UW associate professor of computer science and engineering and of electrical engineering.

The Wi-Fi backscatter tag has communicated with a Wi-Fi device at rates of 1 kilobit per second with about 2 meters between the devices.
Researchers plan to extend the range to about 20 meters and have filed patents on the technology.