Radiation and scattering from infinite periodic printed antennas with inhomogeneous media

The hybrid method of moments (MoM)/Green's function method [1] technique is applied to infinite periodic printed antenna arrays containing dielectric inhomogeneities. The solution uses an integral equation for an infinite per iodic printed array on or over a homogeneous dielectric substrate [2], coup led with equivalent volume polarization currents for dielectric inhomogenei ties on top of the homogeneous substrate. Volume pulse-basis functions were used to expand the volume polarization currents. A hybrid MoM/Green's func tion method solution was then obtained through the matrix form of the probl em. The two-dimensional (2-D) solution of plane wave scattering front a gro unded dielectric slab was used to validate the reaction impedance of the di electric inhomogeneity. Several infinite periodic printed dipole arrays wit h dielectric supports and overlays were studied with this solution and good agreement was observed between the hybrid MoM/Green's function method and waveguide simulator experiments.