How efficient are radio waves for transmission of power?

How efficient are radio waves for transmission of power? Is it possible to transfer 1.5 watts of power through radio waves? If yes, how?

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jimlynch
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This article might be of interest.

Wireless power
http://en.wikipedia.org/wiki/Wireless_power

"Wireless power or wireless energy transmission is the transmission of electrical energy from a power source to an electrical load without man-made conductors. Wireless transmission is useful in cases where interconnecting wires are inconvenient, hazardous, or impossible. The problem of wireless power transmission differs from that of wireless telecommunications, such as radio. In the latter, the proportion of energy received becomes critical only if it is too low for the signal to be distinguished from the background noise.[1] With wireless power, efficiency is the more significant parameter. A large part of the energy sent out by the generating plant must arrive at the receiver or receivers to make the system economical.

The most common form of wireless power transmission is carried out using direct induction followed by resonant magnetic induction. Other methods under consideration are electromagnetic radiation in the form of microwaves or lasers[2] and electrical conduction through natural media.[3]"

blackdog
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Well, microwaves are essentially a form of high frequency radio waves, and you can see that they effectively transfer energy. I think that it would be relatively easy to transfer 1.5 watts over a short distance. The transmitter and receiver would need to have the same resonant frequency for efficiency. It’s been a while since I took physics, so I’m afraid I can’t contribute much more than that. Maybe this article can provide some useful information though:

http://peswiki.com/index.php/PowerPedia:Wireless_transmission_of_electricity

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