Excitation of surface waves different from grounded substrate modes on a finite planar printed dipole array

This paper shows the presence of surface waves different from the conventional grounded dielectric substrate surface wave modes, which can be excited on a finite periodic array of printed dipoles at frequencies for which the spacing between dipoles is typically less than half a wavelength, The effects of such surface waves on the dipole currents and scattering characteristics are also investigated. It is shown that such surface waves may significantly influence the backscattered field, especially for off-broadside incidence.