Re: Wave guides for very low frequencies Hz-kHz

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On Mon, 1 Sep 2008, Efthimios wrote:

> As you all know wave-guides have a cut off frequency (which depends
> mainly on dimensions of the guide) where in lower frequencies cannot
> propagate in the wave-guide. Usually wave-guides operate in the GHz
> range.
>
> Do any of you know if same principle applies for lower frequencies, in
> the Hz =96kHz range?????

Some waveguides have a cut-off frequency. What is the cut-off frequency=20
for a single conducting wire? For co-ax?

> Theoretically it should, but I built one where the dimensions are many
> order of magnitude smaller than wave length but it seems that the
> principle does not apply. EM waves (freq: Hz-kHz) were propagating
> threw my guide.

Through it, or around it? In any case, you'll get tunnelling even if=20
you're below cut-off.

--=20
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html

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