The possibility of generating a higher-order non-diffracting Bessel beam by means of a fast backward spatial harmonic is discussed in this work. The focusing features of the radiated near field are achieved by the excitation of a higher-xorder cylindrical leaky wave supported by an annular metal-strip grating placed on a grounded dielectric slab, which is excited by a circular arrangement of elementary sources. By properly phasing the array elements, the azimuth order of the radiated beam is controlled, offering the possibility of generating a focused beam of arbitrary order carrying a nonzero orbital angular momentum. Full-wave simulations of a prototype are developed using a commercial code and the field profiles are compared with the ideal beam supported by an infinite aperture.
Comite, D., Fuscaldo, W., Burghignoli, P., Baccarelli, P., Galli, A. (2020). Near-field Focusing through Higher-order Cylindrical Leaky Waves. In 14th European Conference on Antennas and Propagation, EuCAP 2020 (pp.1-2). Institute of Electrical and Electronics Engineers Inc. [10.23919/EuCAP48036.2020.9135724].
Near-field Focusing through Higher-order Cylindrical Leaky Waves
Comite D.;Fuscaldo W.;Baccarelli P.;Galli A.
2020-01-01
Abstract
The possibility of generating a higher-order non-diffracting Bessel beam by means of a fast backward spatial harmonic is discussed in this work. The focusing features of the radiated near field are achieved by the excitation of a higher-xorder cylindrical leaky wave supported by an annular metal-strip grating placed on a grounded dielectric slab, which is excited by a circular arrangement of elementary sources. By properly phasing the array elements, the azimuth order of the radiated beam is controlled, offering the possibility of generating a focused beam of arbitrary order carrying a nonzero orbital angular momentum. Full-wave simulations of a prototype are developed using a commercial code and the field profiles are compared with the ideal beam supported by an infinite aperture.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
