Abstract
Abstract
In this paper we discuss the effect of thickness and patterns of graphene film on high-frequency noise absorption performance, experimentally determine the graphene film of electromagnetic reflection, absorption loss and transmission. A simple thickness design microstrip line based structure has been used for the microwave characterization in high-frequency. The graphene material mixing with epoxy (graphene : 70wt%, epoxy:30wt%, conductivity approximately 116 Siemens/m) was spin-coated or screen-printed on FR4 substrate to obtain the desired different film thickness. Complex S-parameter measures reveal different on thickness(0.05mm/0.5mm) in comparison to microstrip line. In this paper we found the graphene dual-film fabricated into the stair pattern with a thickness ratio of 1:10 has better performance than single layer. Both the S parameters and absorption power performance (Ploss/Pin) were measured in the high frequency range of 0.05 GHz–10 GHz. In this study the experiment results show that dual-film power loss reaches 95% at 2GHz were measured using an Agilent Technologies vector network analyzer PNA-X N5242A OPT200(VNA).