Examinations of metal meshing surfaces to retain good optical transparency in different electromagnetic shielding effectiveness

Many radiofrequency (RF) applications, including antenna-on-display and electromagnetic interference shielding, use thin meshed wires to form metal surfaces and ground planes, respectively, with good optical transparency. The characteristics of metal meshed-wire architectures are thus investigated in this paper to interpret their scattering behaviors, which allows the metal meshes to be properly applied to compose antenna radiators or shielding under a good light transparency consideration. They are resembled by an equivalent homogeneous dielectric substrate to simplify numerical simulation complexity. The equivalent conducting and dielectric properties of substrates are extracted from the propagating modes of the Floquet theorem. The equivalent conductivity and dielectric constant allow one to define a characteristic impedance to compute the reflection and transmission coefficients and therefore estimate the power efficiency for practical applications. Validations by numerical full-wave simulations using HFSS software at 28 GHz are shown to demonstrate their characteristics.