Analysis of Near-Field Bessel Beam Focused Arrays with Random Perturbations for Biomedical Applications

The analysis of near-field focused arrays adopting localized Bessel beam launchers is presented in this work. In particular, the radiation problem is addressed by using a simplified scalar model, with each radiating Bessel beam launcher assumed as a properly excited circular aperture antenna, whose aperture field is described by a Bessel function of the first kind and order zero. Furthermore, the positions of the phase references are modeled as suitable random variables, so that a particular aperiodic array configuration is associated with each set of their realizations. It is shown that the magnitude of the total electric field appears to be almost stable with respect to perturbations of launchers positions, and that both the nominal spacing between launchers, as well as their orientation, play an important role on the performance of the analyzed arrays.