Plane wave diffraction by co-planar adjacent blocks

High-frequency closed form solutions are here presented for computing the electromagnetic field propagating in the presence of two co-planar adjacent blocks, which consist of metallic and dielectric (wood, concrete, etc.) materials. The field strength in and around the structure is obtained by considering the geometrical optics and diffraction propagation mechanisms. The uniform asymptotic physical optics approach is used for determining the diffraction contributions due to the involved 90° wedges. The resulting analytical solutions contain the transition function of the uniform theory of diffraction and the Fresnel reflection/transmission coefficients at the interfaces. They are easy to handle and compute, and their efficacy is tested via numerical simulations.