Quarter-wave Fresnel zone planar lens and antenna

Abstract

DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:

Additive manufacturing of graded dielectrics

“…Unlike the previous lens presented, a SZPL uses diffraction to focus instead of refraction. The lens is made up of radially symmetric rings, known as Fresnel zones, which alternate between opaque and transparent [22,23]. The zones are spaced so that the diffracted light constructively interferes at the desired focus.…”

<title>High-efficiency high-gain Fresnel zone plate antennas</title>

“…Fresnel zone plate (FZP) lens antennas are well-known for their advantages of simplicity of design and construction, low loss (due to reduced thickness), low weight, planar construction, and low cost [1][2][3][4][5]. In the last dozen years over 70 papers have been published describing FZP characteristics, including such parameters as bandwidth, focal behavior, gain, far-field patterns, aberrations, off-axis performance, axial intensity dependence, multiple-frequency band performance, and design information [1- 1 1].…”

Millimeter-Wave Offset Fresnel Zone Plate Lenses Characterization

“…Phase-correcting FZPLs [10] improves the efficiency, replacing the transparentopaque zones by different permittivity dielectrics zones [11] or different grooved zones [12]. An alternative to FZPLs, based on a planar periodic screen at optical frequencies, has been presented [13], although, following the authors, improvement on the efficiency has still to be done.…”