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Unread 31-03-2008, 21:34
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gblake gblake is offline
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Re: witricity legality?

Quote:
Originally Posted by Alan Anderson View Post
The odd/nifty/novel thing about what's being called WiTricity here is that it's strictly a "near field" thing. There is no traditional radiative field; as the Wikipedia quote says, it involves "evanescant waves" which fall off exponentially with distance.
Alan - This is aimed at the Wikipedia article, not at you.

There ain't no such thing as a special kind of EM "wave" that is any more or less evanescent than any other in a vacuum.

In Earth's atmosphere, at some frequencies, EM fields are somewhat strongly affected by dust, moisture, ions, (buildings,) etc. At other frequencies, not so much.

But, as for any EM field being more more or less "evanescent" than any other field, and/or getting any other special exemption from Maxwell's equations - I don't think so. Over macroscopic distances all EM fields obey those equations.

Blake
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