Re: MIT wireless energy transfer etc. (fwd)

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Date: Sat, 28 Jul 2007 08:31:01 -0700
From: Ed Phillips <evp@xxxxxxxxxxx>
To: List moderator <mod1@xxxxxxxxxx>
Subject: Re: MIT wireless energy transfer etc.

    Perhaps this question might be closer to 'on topic'.  One of the 
features of this demonstration was the use of "self-resonant" coils and 
another was speculation as to why their measured Q was less than 
expected, with a suggestion that further research was needed in that 
respect.  My personal thought would be that capacity loaded coils would 
have less loss [higher Q].  I'm not about to spend the money to copy 
their coil but their measured Q seems to be in line with what I would 
expect.  Also in working with smaller antenna loading coils [perhaps 6" 
x 6" maximum size] I've never seen much difference between bare coils 
which had been sitting around until thoroughly oxidized and the same 
coils wound with enamel wire which presumably were shiny clean copper.

    Anyone have any thoughts here?

Ed