Enhanced electromagnetic properties of ultrathin pyrolytic carbon films in Ka-band

Due to the importance of satellite communication, electromagnetic compatibility in the Ka band (26 to 37 GHz) has recently become an important concern. We analyze the EM shielding effectiveness in the Ka band of highly amorphous nanometrically thin pyrolytic carbon (PyC) films, which consists of randomly oriented and intertwined graphene flakes with a typical size of a few nanometers. We displayed that the manufactured PyC films, whose thickness is thousand times less than the skin depth of conventional metals, provide a reasonably high EM attenuation. We demonstrate theoretically and observed experimentally that up to 50% of microwave power can be absorbed in a conductive film with thickness much smaller than the skin depth. Different possibilities of the effect enhacement are discussed.