title: Transverse circular-polarized Bessel beam generation by inward cylindrical aperture distribution.
abstract: In this paper the focusing capability of a radiating aperture implementing an inward cylindrical traveling wave tangential electric field distribution directed along a fixed polarization unit vector is investigated. In particular, it is shown that such an aperture distribution generates a non-diffractive Bessel beam whose transverse component (with respect to the normal of the radiating aperture) of the electric field takes the form of a zero-th order Bessel function. As a practical implementation of the theoretical analysis, a circular-polarized Bessel beam launcher, made by a radial parallel plate waveguide loaded with several slot pairs, arranged on a spiral pattern, is designed and optimized. The proposed launcher performance agrees with the theoretical model and exhibits an excellent polarization purity.
authors.forename: S C
authors.initials: SC
authors.lastname: Pavone
authors.forename: M
authors.initials: M
authors.lastname: Ettorre
authors.forename: M
authors.initials: M
authors.lastname: Casaletti
authors.forename: M
authors.initials: M
authors.lastname: Albani