Properties of waves guided between parallel, artificially hard surfaces

A moment method is developed for studying reflections from periodic strips on a grounded dielectric slab. The method is simple and well suited for investigations of the hard surface properties of these surfaces as well as the properties of waves guided between two such surfaces. In the geometry chosen, the two surfaces extend to infinity in two directions. If the surfaces at z = 0 and z = a are ideally hard, a TEM (transverse electromagnetic) wave with uniform field components E/sub y/ and H/sub z/ is allowed to propagate in the x direction. The physical structure allows the propagation of TE/sub x/ modes. Useful information on these modes is derived from both a simple plane-wave approach and a more rigorous solution of the eigenvalue problem.<>