A Formulation for Efficient Analysis of Scattering from Truncated Periodic Structures

This work presents a novel formulation, based on the dipole moment (DM) method and Method of Moments utilizing modified RWG basis to efficiently analyze scattering from truncated periodic structures, where the unit-cell elements of these structures are arbitrarily shaped and are inhomogeneous objects in general. The key point of using the formulation is that the scattered fields are obtained in closed-forms for arbitrarily shaped metallic as well as dielectric objects, which facilitates efficient computation of the MoM matrix in comparison to the conventional approach for matrix generation which utilizes RWG basis functions. Numerical results obtained by using the proposed approach show good agreement with those obtained using a commercial MoM software package.