Graphene material shields EMI best. Single-layer graphene is an excellent choice for high-performance EMI shielding materials. cvd-synthesized graphene is more than 7 times more effective at shielding EMI than a gold film of the same thickness.
Graphene EMI shielding effectiveness measurement device schematic diagram. Waveguide measurement system (frequency range:2.2-7 GHz), including two waveguide coaxial adapters and a vector network analyzer. The dimensions of the graphene shield in the waveguide are 8.6 cm x 4.3 cm.Measurements are performed using a horn antenna, a transverse electromagnetic modal unit and a vector network analyzer. In this measurement, a single frequency of 2 GHz was used.
To accurately assess the EMI shielding capability of a graphene layer, the researchers needed a true single layer of graphene covering the entire shielding area.
Graphene is lightweight, ultrathin, transparent, and flexible, making it ideal for electromagnetic shielding materials such as portable electronics, transparent electronics, automotive, and 3D integrated circuit EMI isolation.
Ideal single-layer graphene can shield up to 97.8% of incident waves; our actual cvd-synthesized graphene can shield about 40%. This finding is significant because it means that graphene is the most effective EMI shielding material, in terms of shielding per mass.