Turning radio waves into power (with circuits printed on paper)

Casey Johnston

Turning radio waves into power (with circuits printed on paper)

Researchers at Georgia Tech have found a way to harvest energy from electromagnetic waves in the air. The harvesting devices are produced using an inkjet printer and can collect small amounts of power from a wide band of frequencies–everything from FM radio up to radar.

The technology isn’t new—researchers have floated concepts (and a few devices) that can harvest energy from ambient WiFi signals and other small sources, but these are usually able to pull power only from tiny slices of the electromagnetic spectrum (perhaps just a few KHz). The new system can draw energy from much wider electromagnetic swaths: 100MHz to 15GHz.

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