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| | relative permittivity and relative permeability of water - RF Cafe Forums |
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| elia_lyza | 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 | Do anybody knows the relative permeability and relative permittivity for water?
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| nubbage | 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 | 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
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| nubbage | 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 | 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.
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| nubbage | Post subject: Posted: Wed Jan 07, 2009 12:28 pm |
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Joined: Fri Feb 17, 2006 12:07 pm
Posts: 268
Location: London UK | Even further data, applicable to water at 20* C and at F=2.45GHz can be found at http://www.bsyse.wsu.edu/tang/Previousw ... ang100.pdf This shows epsilon' as 78 and epsilon" as 6.8 Google is a great tool for this sort of question.
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Posted 11/12/2012
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Kirt
