British engineers from University College London have developed a passive radar system that can see through walls using the WiFi signals generated by wireless routers and access points. The system, ...

Electrical engineers at the University of Washington have come up with a new type of Wi-Fi hardware that uses 10,000 times less power than existing technology, Wiredreports. That could have big ...

In Passive Wi-Fi, power-intensive functions are handled by a single device plugged into the wall. Passive sensors use almost no energy to communicate with routers, phones and other devices. Disclaimer ...

A strong wifi signal close to a base station (a couple of feet distance) is about -25 to about -28dBm on 2.4GHz. So close to a base station the passive return signal would be around -65 to -68dBm.

University of Washington CSE and EE researchers introduce Passive Wi-Fi, a system that can generate Wi-Fi transmissions using 10,000 times less power than conventional methods. With this system, Wi-Fi ...

I think it would also be interesting to see this functionality incorporated into phones or wearable devices; the increasingly-popular "low power mode" would still allow wifi communications while ...