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New Printable Antenna Can Harvest Ambient Energy To Power Small Electronics

• Rebecca Boyle via

A new ultra-wideband antenna printed on paper or plastic can harvest ambient energy, enabling wireless sensors to tap into electromagnetic currents in the air around them. The device captures energy from a wide spectrum of frequencies, converts it to direct current, and stores it in capacitors or batteries.

Researchers at Georgia Tech scavenged sufficient microwatts to power a temperature sensor, using the ambient energy produced by a television station signal that was a third of a mile away.

More powerful systems that tap into multiple wireless bands could generate one milliwatt or more — enough to power small wireless sensors and microprocessors. Researchers hope that when it’s combined with advanced capacitor technology, the device could provide up to 50 milliwatts.

It’s not exactly the dream of wireless power envisioned by Nikola Tesla, who proposed vast tower networks transmitting electric fields. It’s more akin to siphoning juice from someone else’s battery. When the antenna receives a signal, the electromagnetic energy is converted from AC to DC.

1 Comments in Response to

Comment by Joe Tittiger
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So what's new here RFID's have been passively powered  for 20 years?

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