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Engineers Design Battery-Free Wireless Device
11/11/2013

University of Washington's Ambient Backscatter device is equipped with an antenna that picks up broadcast signals from TV or cellular sources and converts them into hundreds of microwatts of electrical power.   (Source: University of Washington)
University of Washington’s Ambient Backscatter device is equipped with an antenna that picks up broadcast signals from TV or cellular sources and converts them into hundreds of microwatts of electrical power.
(Source: University of Washington)

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Charles Murray
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Re: just liike RFID
Charles Murray   11/11/2013 7:04:52 PM
NO RATINGS
Yes, naperlou, I believe RFID tags have used this principle for a long time, haven't they?

Elizabeth M
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Ambient backscatter
Elizabeth M   11/11/2013 11:54:42 AM
I thought this technology sounded familiar...I wrote about it in September: http://www.designnews.com/author.asp?section_id=1386&doc_id=267327 But I think your story takes a slightly different approach and talks about some aspects of the technology I didn't cover, so it's still relevant!

naperlou
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just liike RFID
naperlou   11/11/2013 8:52:33 AM
Cabe, the approach you mention is just the way RFID tags work.  In the case of RFID a device, the reader, sends out a signal and, for passive RFID tags, the energy is used to power the tag and respond with the information.  That is not to say that this is a great idea.  As your article points out, in populated areas we are inundated with RF signals.  Of course, the people who are against smart meters, for example, which often use WiFi, say that it is the meters that cause them medical problems.  One of the types of energy we have in abundance in the air is WiFi signals.  This research shows that there is a lot more than the meters energizing the environment around us. 

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