Holographic Surface Leaky-Wave Lenses With Circularly-Polarized Focused Near-Fields—Part I: Concept, Design and Analysis Theory

Gómez‐Tornero, José Luis; Blanco, Darwin; Rajo‐Iglesias, Eva; Llombart, Nuria

doi:10.1109/tap.2013.2257644

Cited by 85 publications

(39 citation statements)

References 37 publications

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“…In addition, the absence of a metallic rim makes this solution scalable also at terahertz applications. In [12], a nonresonant solution for near-field focused point is presented. It constitutes a real improvement of the rough solution introduced in [20], but the double slits designed to radiate do not give any control on the polarization, thus resulting in a quite high cross-polar component that is radiated outside the main beam, with a reduced efficiency.…”

Section: Introductionmentioning

confidence: 99%

Large Depth of Field Pseudo-Bessel Beam Generation With a RLSA Antenna

Mazzinghi

Balma²,

Devona³

et al. 2014

IEEE Trans. Antennas Propagat.

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The paper discusses the possibility of generating a pseudo-Bessel beam, with a propagation distance of several hundreds of wavelengths in microwave and millimeter frequency band, by using a radial line slot array (RLSA). A specific application for non-contact microwave detection of buried mines has been considered as test case. The design benefits of a holographic approach to assure the required aperture field distribution and makes use of an ad hoc optimization tool to control the antenna slot layout. The predicted and measured antenna behaviors show that high efficiency and polarization purity can be obtained by such a compact and flat antenna, achieving at the same time both manufacturing and setup simplicity.

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Section: Introductionmentioning

confidence: 99%

Large Depth of Field Pseudo-Bessel Beam Generation With a RLSA Antenna

Mazzinghi

Balma²,

Devona³

et al. 2014

IEEE Trans. Antennas Propagat.

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“…Finally, the present MoM formulation can be used for the analysis of radially non-uniform metasurfaces, whose locally homogenized surface impedance is a step-wise function of the radial coordinate ρ (e.g., the surface impedance can vary between adjacent slots). This feature can be useful for the analysis of radially tapered 2-D LWAs [40].…”

Section: Method-of-moments Approach For Truncated Structuresmentioning

confidence: 99%

“…Radially non-uniform metasurfaces can be also considered by the MoM approach, whereas the radial dependence of the local surface impedance prevents from establishing a simple network model. The class of structures that can be studied is thus enlarged, including, e.g., 2-D LWAs with a radially tapered illumination function [40].…”

Section: Introductionmentioning

confidence: 99%

Omnidirectional Radiation in the Presence of Homogenized Metasurfaces

Ruscio¹,

Burghignoli²,

Baccarelli³

et al. 2015

PIER

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Abstract-Analytical and numerical approaches are presented for modeling the interaction of azimuthally symmetric fields with omnidirectional metasurfaces, based on the use of locally homogenized equivalent sheet impedances. Radially uniform metasurfaces on layered dielectric media are described in terms of a spectral impedance dyadic, thus allowing for the derivation of the field excited by omnidirectional sources through a simple transmission-line model. In a first approximation, the effect of circular edges in laterally truncated structures is taken into account through an efficient physicaloptics method. Then, truncated and radially non-uniform homogenized layered structures are treated numerically with the method of moments, by suitably extending a recently developed spectral-domain formulation. Numerical results are presented for planar radiating structures based on omnidirectional metasurfaces, comparing the radiation patterns obtained through the proposed homogenized models with those calculated by means of full-wave simulations. The discussion emphasizes the validity of the proposed approaches and their usefulness in the analysis of two-dimensional leaky-wave antennas based on printed omnidirectional metasurfaces.

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“…It has been already widely exploited the fact that, by appropriately tapering Pk-', leaky-wave radiation can be mold o with a certain purpose [2], [15]. In particular, it is possible to focus the radiated energy at a focal point placed at a distance j from the center of the aperture, as depicted in Fig.…”

Section: Ne Ar-field Focusing With Le Aky-w Avesmentioning

confidence: 99%

Near-field focusing employing sinusoidally modulated reactance surfaces

Iliopoulos¹,

Esquius-Morote²,

Mosig³

et al. 2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

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International audienceThis work aims at showing the feasibility of performing 2D near-field focusing using a Leaky-Wave Lens (LWL) based on Sinusoidally Modulated Reactance Surfaces (SMRS). The polarization of the field at the focus is perpendicular to the antenna aperture, due to the geometry of the structure. Electrically small focal distances are achieved, combined with very small spot diameters. The limitations of this approach are discussed, which are mainly related to the prediction of the focal point. The concept is proven by simulations and experimental testing is in progress. © 2016 European Association of Antennas and Propagation

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Holographic Surface Leaky-Wave Lenses With Circularly-Polarized Focused Near-Fields—Part I: Concept, Design and Analysis Theory

Cited by 85 publications

References 37 publications

Large Depth of Field Pseudo-Bessel Beam Generation With a RLSA Antenna

Large Depth of Field Pseudo-Bessel Beam Generation With a RLSA Antenna

Omnidirectional Radiation in the Presence of Homogenized Metasurfaces

Near-field focusing employing sinusoidally modulated reactance surfaces

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