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We propose in detail Antennas for generating Non-Diffracting Beams ofMicrowaves, for instance with frequencies of the order of 10 GHz, obtainingfair results even when having recourse to realistic apertures endowed withreasonable diameters. Our first proposal refers mainly to sets of suitableannular slits, having in mind various possible applications, including remotesensing. Our second proposal --which constitutes one of the main aims of thispaper-- refers to the alternative, rather simple, use of a Parabolic Reflector,illuminated by a spherical wave source located on the paraboloid axis butslightly displaced with respect to the Focus of the Paraboloid. Such aparabolic reflector yields "extended focus" (non-diffracting) beams. [OCIScodes: 999.9999; 070.7545; 050.1120; 280.0280; 050.1755; 070.0070; 200.0200.Keywords: Non-Diffracting Waves; Microwaves; Remote sensing; Annular Arrays;Bessel beams; Extended focus; Reflecting paraboloids; Parabolic reflectors;Parabolic antennas].

Parabolic antennas, and circular slot arrays, for the generation of Non-Diffracting Beams of Microwaves