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New discovery scavenging power from transmit energy

Georgia Tech School of Electrical and Computer Engineering, professor Manos Tentzeris and his team discovered a new way to capture and harness energy transmitted by sources like radio and television transmitters, cell phone networks and satellite communications systems. By scavenging this ambient energy from the air around us, the technique could provide a new way to power networks of wireless sensors, microprocessors and communication chips. This new way may helps reduce the effect of Global warming?

Georgia Tech School of Electrical and Computer Engineering Professor Manos Tentzeris, said,
“There is a large amount of electromagnetic energy all around us, but nobody has been able to tap into it,”

Scavenging Process

The team is using inkjet printers to combine sensors, antennas and energy-scavenging capabilities on paper or flexible polymers, scavenging devices can capture this energy, convert it from alternating current to direct current and store it in capacitors and batteries. Currently, this technology can take advantage of frequencies from FM radio to radar a range spanning 100 megahertz to 15 gigahertz or higher. From many different frequency ranges, or bands that communication devices transmit energy.


The resulting self-powered wireless sensors could be used for chemical, biological, heat and stress sensing for the defence sector and the industry;
Radio frequency identification tagging for manufacturing and shipping
Monitoring tasks in many fields
Including communications and power usage.

It is to note that the researchers’ team has operated a temperature sensor using electromagnetic energy captured from a TV station that was half a kilometer away and succeeded in it.

Hundreds of microwatts, power amounting have already yielded by Scavenging experiments utilizing TV bands and multi-band systems are expected to generate one mill watt or more which amount of power is enough to operate: many small electronic devices, including a variety of sensors and microprocessors.

The Georgia Tech team expects to power devices that require more than 50 mill watts by combining energy-scavenging technology with super capacitors and cycled operation. In this approach, energy builds up in a battery-like super capacitor and is it utilized when the required power level is attained.

And they are preparing another demonstration in which a microprocessor-based microcontroller would be activated simply by holding it in the air.

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