Do duroplastic or thermoplastic material have the best shielding effect of a electromagnetic field at 1 GHz?

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Alain Celzard

By "duroplastic", I guess that you mean "thermoset". Anyway, whatever it is, a polymer can't have a good EMI shielding efficiency, at it is not electrically conducting. You have to load it with conductive fillers. For example, 2wt. % of carbon nanotubes in epoxy works quite well for this application. There are many papers available about that, but pure polymer is not good.

Alain

Amipara Manilal D

For better shielding, if size and cost permit, you can use double fiber layer sandwiched with wood and or conductive filler. Thickness will offer higher attenuation.