> I agree, you can't have that system in millions of places, and not
> have significant problems.
> Also, the transfer efficiency is not very good.

I don't think they mentioned efficiency. It can be quite good due to 
resonance (aagh, the magic buzz word, kill it quickly, ...) :-). 
HOWEVER in this case it is THE enabling technology.

Similarly at more than tiny ranges pickup into anything non resonant 
is minimal.

My units do/did not use coils of that size, but I can get good energy 
transfer over 10's of mm, which was fine for my application. You can 
hold the transmitting loop when it is transferring say 100 Watt into 
receivers and not couple useful power into yourself.




            Russell


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