Green’s function of a point source above a periodically-defected-grounded dielectric slab

Green´s function for a point source above a two-dimensional periodic boundary is presented in spectral form based on the zero term only of the infinite scattering Floquet modes. This formulation is applied to obtain the Dyadic Green´s function of a printed source above a dielectric slab with periodically defected ground plane by using a generalized equivalent network of this defected ground plane. This equivalent network is obtained from the reflection coefficients of the defected-grounded slab for different angles of incidence. By determining the generalized equivalent network of the defected ground plane, the problem of the Green´s function can be formulated by using coupled TE and TM transmission line networks.