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Is there a database (or any other source) of graphs of average transparency of various materials (cardboard, concrete, gypsum etc.) as a function of wavelength?

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up vote 2 down vote accepted

Studies have been done at a few popular frequencies, but in general this is hard to do with RF. You can get a feel for how it was done at 2Ghz and 5Ghz from this article

They also publish tables of their results which you might be able to scale to other frequencies as a starting point.

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