Author Topic: Converting Wi-Fi signals to electricity with new 2-D materials  (Read 797 times)

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Offline Technobabble_

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Converting Wi-Fi signals to electricity with new 2-D materials
« on: January 31, 2019, 09:42:14 pm »
This popped up on my feed today. Any thoughts on it?

Article: http://news.mit.edu/2019/converting-wi-fi-signals-electricity-0128

Actual paper: https://www.nature.com/articles/s41586-019-0892-1

Meta: I'm somewhat pissed that the MIT article didn't link directly to the Nature paper.
 
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Offline timelessbeing

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Re: Converting Wi-Fi signals to electricity with new 2-D materials
« Reply #1 on: January 31, 2019, 09:54:56 pm »
so?  :-//
 

Offline Daixiwen

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Re: Converting Wi-Fi signals to electricity with new 2-D materials
« Reply #2 on: February 01, 2019, 09:04:02 am »
I don't see why it wouldn't be possible. But the real question is would it be practical?
40 microwatts to power a LED though... it would need to be a very small LED!
The other problem I see for "small communicating devices" is that you can only use a fraction of those 40 microwatts to transmit a signal back. I'm not sure the transmission would be reliable. If you need more power you'd need a capacitor that gets charged when not transmitting, and that can deliver more juice when needed. But at that point it might be more practical and economical to just put there a small lithium cell.
 

Offline Technobabble_

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Re: Converting Wi-Fi signals to electricity with new 2-D materials
« Reply #3 on: February 01, 2019, 02:26:00 pm »
Quote
so?  :-//


Your comment isn't helpful. What do you mean?
 

Offline KaneTW

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Re: Converting Wi-Fi signals to electricity with new 2-D materials
« Reply #4 on: February 01, 2019, 02:30:44 pm »
Rectennas aren't new technology. Just, not very useful. 50 uW on a LED isn't going to be more than a few millicandela, so I'm not sure what's the point of that example. Maybe coupled with some sort of energy storage for devices that are on for a short while with long periods of rest.
 

Offline timelessbeing

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Re: Converting Wi-Fi signals to electricity with new 2-D materials
« Reply #5 on: February 01, 2019, 08:38:14 pm »
Quote
so?  :-//


Your comment isn't helpful. What do you mean?

I mean is there a particular reason you bring this up? RFID tags and proximity cards have been using RF energy for a decades. It's pretty common stuff.
 


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