Composites based on biochar derived from sewage sludge as filler in epoxy resin are fabricated and measured in a waveguide in C‐band. Biochar is cheap, readily available and environmentally friendly and thus is a very good contender among other carbon‐based materials for use in shielding applications. Biochar provide promising results in term of transmission of <−10 dB for a composite with 20 wt.% biochar filler. The dissipation loss, calculated from the scattering parameters show that a significant portion of the losses are due to dissipation.
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Savi et al. (2020) studied this question.
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