Re: Wireless Transmission

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 03:05 PM 1/12/2005, you wrote:
> Original poster: Teslamad@xxxxxxx
> Does anyone know the up to date research on wireless transmission? Has it 
> been documented yet? (i.e Wendover?) Or is Tesla's idea of "non-hertz'n" 
> waves still not fully understood?


Wireless transmission?  As in a "4 on the floor" stick shift, or even my 
old TurboHydramatic 350 (although that had wires for the Neutral/Park 
starter lockout).


But really, I assume you're talking about wireless transmission of power? 
Sure, it works. All in accordance with well understood laws of physics. As 
always the challenge is in getting decent efficiency in converting 
electrical power to EM waves and then getting efficient conversion from EM 
waves back into usable power.

For RF, there are power amplifiers that are 85% efficient up to a few tens 
of MHz (for kilowatt levels). For higher frequencies the efficiencies drop 
a bit (or a lot) although for the hundreds of milliwatts range at 2.4 GHz, 
I think there are some amplifiers in that sort of efficiency range.

One can radiate the power with comparable efficiency, although, that would 
be a fairly non-directive pattern, unless you've got a really big, low 
loss, reflector.


Receiving the power is much more of a challenge.

http://www.kurasc.kyoto-u.ac.jp/jusps/S6-1.pdf provides some useful 
information.