Re: About wireless energy transfer

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 04:01 PM 2/7/2007, you wrote:
> Original poster: Ed Phillips <evp@xxxxxxxxxxx>
>
> Original poster: westland <westland@xxxxxx>
>
> A couple of wikipedia articles at
> http://en.wikipedia.org/wiki/Evanescent_wave_coupling
> and
> http://en.wikipedia.org/wiki/Evanescent_wave "
>
>    Not clear to me that there are any real "waves" involved in 
> coupling via mutual inductance or capacitance.  Evanescent wave 
> sounds great but.........
>
> Ed


If the wavelength is very long compared to the distance, then the 
wave coupling reduces to the conventional mutual L or capacitive 
coupling.. (that is, you can ignore the propagation speed of the wave 
from source to sink, and consider it as a quasi static 
system)..{coincidentally, a coworker who's teaching a fields and 
waves class was discussing this the other day}

But, you're right.. evanescent sounds much cooler...

Especially if you can represent a macro phenomenon that everyone 
knows about (electromagnetics) using a more obscure notation with a 
less obvious model (quantum tunneling)... I'm surprised he didn't 
talk about using photons for energy transfer.

And, of course, as others have noted..
"The team is now trying to develop a prototype device. "