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Here is a plot of microwave attenuation in atmosphere:

enter image description here (source)

I'm looking for a similar plot, but for pure water, and a frequency range covering at least 100 MHz to 2 GHz, hopefully more.

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There is a plot from which you can extract that data in the classic E&M text by Jackson. It actually covers most of the EM spectrum, but... –  dmckee Aug 6 '12 at 18:38
    
A quick Google search gave this: en.wikipedia.org/wiki/Electromagnetic_absorption_by_water –  hdhondt Aug 7 '12 at 4:11
    
@hdhondt Unfortunately the plot there ends at 30 GHz and only mentions that absorption is "continuous" from there onwards. –  romkyns Aug 7 '12 at 7:48

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