The article says Shyam Gollakota uncovered a way to create Wi-Fi signals without radio transistors. And here’s the real payoff: These “passive Wi-Fi” devices use 10,000 times less power than a typical Wi-Fi chip, and 1,000 times less power than the most efficient Bluetooth, thereby significantly reducing the need for battery power.
Read more here.
http://www.popsci.com/man-who-powers-devices-with-wi-fi
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