Computation of layered mixed potentials for the accurate and efficient analysis of periodic printed structures

Original acceleration procedures are proposed for the efficient calculation of the vertical components of the dyadic and scalar mixed-potential layered-media periodic Green´s functions for various types of periodic structures. The extraction of suitable asymptotic terms, i.e., quasi-static images, is performed in order to speed up the convergence of the relevant spectral series. The extracted terms can be expressed as potentials for array of half-plane and half-line sources, depending on the type of the considered periodic Green´s function. The relevant numerical results show the remarkable improvements in the efficiency of the approach.