Analysis of Resonant Bessel-Beam Launchers based on Isotropic Metasurfaces

Resonant Bessel-beam launchers are azimuthally invariant structures characterized by a circular grounded dielectric slab with an isotropic metasurface on top. Previous works analyzed the launchers performance for some specific cases, assuming TE or TM polarizations, inductive or capacitive metasurfaces, cavities with sub-wavelength or half-wavelength height. We show here with both theoretical and full-wave results that the inductive or capacitive nature of the metasurface has a fundamental role in the radiating behavior of these devices. Results are reported for the relevant TM-polarized case, considering air-filled, half-wavelength thick cavities. The extension of this analysis to the TE-polarized and dielectric-filled case will be discussed at the conference.