Soon it will be possible to power small electronic devices using just “ambient” energy from existing radio waves produced by television, radio and mobile-phone transmitters.
From N.Y. Times Say Bye Bye To Batteries
Until recently, the use of radio waves to power wireless electronic devices was largely untapped because the waves dilute quickly as they spread.
“Ambient radio waves,” Dr. Smith of Intel said, “can already provide enough energy to substitute for AAA batteries in some calculators, temperature and humidity sensors, and clocks.”
Many electronic devices are limited by batteries that fade away or can’t survive temperature extremes, he said. But, he added, “we are on the cusp of an explosion in small wireless devices” than can run on alternatives to battery power. “Devices like this can live on and on,” he said.
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