Enhanced microwave shielding effectiveness of ultrathin pyrolytic carbon films

Abstract

(Received 14 March 2013; accepted 2 August 2013; published online 16 August 2013) Electromagnetic properties of pyrolytic carbon (PyC) films with thickness from 5 to 241 nm are studied experimentally and numerically at 28 GHz. We observe experimentally that PyC films are capable to absorb up to 50% of microwave power in the Ka-band. By using boundary conditions in the rectangular waveguide, we demonstrate theoretically that 50% of microwave power can be absorbed in a conductive film with thickness much smaller than the skin depth. The results of modelling for PyC films on silica substrate are in excellent coincidence with the experimental data. V C 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4818680]