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Energy from radio waves

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NiHaoMike:
http://amasci.com/tesla/tesceive.html
Maybe half of the problem of wirelessly providing power to cars is already solved by existing radio stations. Now make a resonant antenna out of superconductor, tune it to the frequency of a nearby radio station, and build an electric car to use that energy.

alm:
Apart from the crackpot-that-disproves-current-phyics factor, I won't comment on that since I'm not a physicist, there's still the issue of conservation of energy. The antenna might be really large, but any energy received must be transmitted somewhere, I doubt that your average AM radio station is set up for this. If an electrical car uses around 1kW (probably much more), how many cars are there within the area of such an antenna? Tuning an (electrically) huge antenna to an AM radio station would probably kill the reception. He also mentions that you have to get the antenna further off the ground for these frequencies, probably not that practical on top of a car.

EEVblog:
Take the basic theory in my Airnergy de-bunk video and do the math...

It's a safe bet you'll get more energy from Flintstones style peddle power (about 500W max).

Dave.

NiHaoMike:
Perhaps the first prototype would be installed on a tall stationary tower instead of a vehicle. It could still be used to power cars by recharging batteries or making hydrogen.

It is a source of "free" energy in that drawing from it does not increase the load on the grid, although it is limited.

--- Quote ---Take the basic theory in my Airnergy de-bunk video and do the math...
--- End quote ---
The distance might need to be closer than would be practical. It is definitely possible to extract very significant amounts of energy without superconductors as long as you could get it really close.

It would be best to shut down those radio stations and use the freed-up power directly, but it's not going to be easy...

alm:

--- Quote from: EEVblog on July 14, 2010, 10:41:41 pm ---Take the basic theory in my Airnergy de-bunk video and do the math...

--- End quote ---
I believe the claim is that the effective area of this antenna is much larger than the physical size, if that's true, it could extract some significant amount of energy from the waves. AM transmitters are also much more powerful than access points. I won't comment on the physics side, but I wouldn't bet on it being true.


--- Quote from: NiHaoMike on July 14, 2010, 10:48:59 pm ---It is a source of "free" energy in that drawing from it does not increase the load on the grid, although it is limited.

--- End quote ---
How are the radio transmitters fed?


--- Quote from: NiHaoMike on July 14, 2010, 10:48:59 pm ---It would be best to shut down those radio stations and use the freed-up power directly, but it's not going to be easy...

--- End quote ---
Or conserve energy some other way, I doubt that the energy used by radio stations is a significant part of the total power draw for most regions. Might as well not go through the trouble of trying to defy the current understanding of physics just to turn off a few 100kW or so loads, just claiming that AM radio increases the chance of cancer in children on national TV might have the same effect ;).

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