Is a duromere or a thermopltastic material the better absorption material of the electromagnetic field a 2-4 GHz ?
Frank, as you certainly know, in order to slow down the particle component of a radiation, the best way is to employ high electron density atoms as components of the shielding material.
Anyway, going back to your question, the best alternative to dense atoms like lead (Pb) is to employ hydrogen (H) rich materials like liquid hydrogen, liquid water, on in the case of polymers, polyolephines like PE or PP which are two thermoplastic polymers.
By the way these materials have week thermal and mechanical properties, therefore if the electromagnetic shielding is not the only technical requirement of the shielding material that you are looking for, the alternative choice is probably duromere.
The best absorbing material in the frequency 1 GHz and above is the Ferrite-titanate material which has high equal complex permittivity and permeability. But usually it used with a special matching technique.
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