用于产生无衍射微波波束的抛物面天线和圆形缝隙阵
Parabolic antennas, and circular slot arrays, for the generation of Non-Diffracting Beams of Microwaves
摘要：
我们提出了详细的用于产生微波的非衍射光束，例如，频率为10 GHz的顺序，获得公平的结果，即使在求助于现实的孔径赋予合理的直径。我们的第一个建议主要是指一套合适的环形狭缝，考虑到各种可能的应用，包括遥感。我们的第二个建议-这构成了本文的主要目的之一-是指替代的，相当简单的，使用抛物面反射器，由位于抛物面轴上的球面波源照亮，但相对于抛物面的焦点略有位移。这样的抛物面反射器产生“扩展焦点”（非衍射）光束。[OCIS代码：999.9999; 070.7545; 050.1120; 280.0280; 050.1755; 070.0070; 200.0200。保留字：非绕射波微波;遥感;环形天线阵贝塞尔光束扩展焦点;反射抛物面抛物面反射器抛物面天线]。
英文摘要：
We propose in detail Antennas for generating Non-Diffracting Beams of Microwaves, for instance with frequencies of the order of 10 GHz, obtaining fair results even when having recourse to realistic apertures endowed with reasonable diameters. Our first proposal refers mainly to sets of suitable annular slits, having in mind various possible applications, including remote sensing. Our second proposal --which constitutes one of the main aims of this paper-- refers to the alternative, rather simple, use of a Parabolic Reflector, illuminated by a spherical wave source located on the paraboloid axis but slightly displaced with respect to the Focus of the Paraboloid. Such a parabolic reflector yields "extended focus" (non-diffracting) beams. [OCIS codes: 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].
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