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relative permittivity and relative permeability of water - RF Cafe
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| elia_lyza
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Post subject: relative permittivity and relative permeability of water
Posted: Mon Jan 05, 2009 5:49 am
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Joined: Thu Dec 18, 2008
10:56 pm
Posts: 4
Location: shah alam,selangor
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Do anybody knows the relative permeability and relative
permittivity for water?
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nubbage |
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Post subject:
Posted: Wed Jan 07, 2009 12:10 pm
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Joined: Fri Feb 17, 2006
12:07 pm
Posts: 268
Location: London UK
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Hi ella_lyza Try this url.
http://www.lsbu.ac.uk/water/microwave.html
The complex permittivity data given is good
if the water is pure, but if mixed with other complex
molecules, the value drops rapidly according to
the relative mixture %. Water is paramagnetic,
but probably has a very low value ie close to 1.0
_________________
At bottom, life is all
about
Sucking in and blowing out.
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nubbage |
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Post subject:
Posted: Wed Jan 07, 2009 12:21 pm
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Joined: Fri Feb 17, 2006
12:07 pm
Posts: 268
Location: London UK
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Further data:
at X band these figures are very
reliable, coming from Institute of Physics, where
the data was claimed to be accurate to within 0.2%.
I quote:
It is found that epsilon '=62.256(37),
epsilon "=31.570(47) at f=9.346 GHz, T=293K; and
epsilon '=64.156(38), epsilon "=28.623(43) at f=9.370
GHz, T=298K.
My comment:
Note that over
a small frequency range (9.34 to 9.37GHz) the value
changes by about 4%, which I find rather surprising.
_________________
At bottom, life is all
about
Sucking in and blowing out.
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nubbage |
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Post subject:
Posted: Wed Jan 07, 2009 12:28 pm
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| General |
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Joined: Fri Feb 17, 2006
12:07 pm
Posts: 268
Location: London UK
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_________________
At bottom, life is all
about
Sucking in and blowing out.
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Posted 11/12/2012
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