Scattering from periodic structures with thick metallization-strip gratings, corrugated surface, and slotted screen

A mixed spectral domain approach for analyzing periodic structures with thick metallization and dielectric loading is presented. The spectral Green's functions required in the formulation are derived using the spectral domain immittance approach. With the proper choice of basis functions, this method provides a fast convergent numerical solution to various periodic structures, i.e. a thick strip grating, a groove-corrugated surface, and a thick slotted screen, all with dielectric loading. To illustrate the accuracy and computational efficiency of the method, the transmitted power of a thick strip grating is calculated for incidence angles of 0 and 30 degrees . The reflected power from a corrugated surface due to a plane wave at normal incidence is also calculated along with the transmitted power of a thick slotted screen at normal incidence.<>