Rice husk-based hierarchically porous carbon and magnetic particles composites for highly efficient electromagnetic wave attenuation

For RHPC/Fe, RL of −21.8 dB can be achieved with the absorption bandwidth (RL ≤ −10 dB, ABW) of 5.6 GHz at a thickness of 1.4 mm, while for RHPC/Co, RL of −40.1 dB can be achieved with ABW of 2.7 GHz at a thickness of 1.8 mm.