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Diffractional optics of millimetre waves
Igor V. Minin,Oleg V. Minin +1 more
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TLDR
Theory of diffraction as discussed by the authors, the influence of surface form on the structure of Fresnel zones, and short focusing Fresnel zone plates are used for diffraction quasioptics.Abstract:
Theory of diffraction. Short focusing Fresnel zone plates. Elements of diffraction quasioptics. Synthesis of diffractional elements. Diffractional antennae at millimetre wavelengths. The influence of surface form on the structure of Fresnel zones. Applications of diffractional optics and quasioptics. Diffractional antennae. Optical constants of materials at submillimetrics and millimetric wavelengths.read more
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Journal ArticleDOI
Focusing Properties of Fresnel Zone Plate Lens Antennas in the Near-Field Region
Shaya Karimkashi,Ahmed A. Kishk +1 more
TL;DR: In this paper, the focusing properties of FZP lens antennas in the near-field region are presented at the ka-band, where they show displacement of the maximum intensity of the electric field along the axial direction from the focal point toward the antenna aperture.
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A Full Electromagnetic Analysis of Grooved-Dielectric Fresnel Zone Plate Antennas for Microwave and Millimeter-Wave Applications
David R. Reid,Glenn S. Smith +1 more
TL;DR: In this article, the body-of-revolution finite-difference time-domain (BOR-FDTD) method was used to analyze the focusing ability of Fresnel zone plate antennas.
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A Comparison of the Focusing Properties of a Fresnel Zone Plate With a Doubly-Hyperbolic Lens for Application in a Free-Space, Focused-Beam Measurement System
David R. Reid,Glenn S. Smith +1 more
TL;DR: In this article, a Fresnel zone plate is designed to perform the function of a doubly-hyperbolic lens, and the focusing characteristics of the zone plate and the lens are compared using both measured data and body-of-revolution finite-difference time-domain simulations.
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A Systematic Study of Varying Reference Phase in the Design of Circular Fresnel Zone Plate Antennas
TL;DR: In this article, the effect of changing the reference phase from the standard 0deg to any value between 0deg and 180deg was studied using finite difference time domain software to simulate a circular Fresnel zone plate antenna, and it was found that a significant improvement in the level of the first sidelobe could be achieved without sacrificing gain or cross-polarization levels.
Journal ArticleDOI
Soret fishnet metalens antenna.
Bakhtiyar Orazbayev,Miguel Beruete,Victor Pacheco-Peña,Gonzalo Crespo,Jorge Teniente,Miguel Navarro-Cia +5 more
TL;DR: It is demonstrated that simplicity is not at odds with performance and it is shown how the fishnet metamaterial can improve the radiation pattern of a Soret lens.