Synthesis of Modulated-Metasurface Antennas With Amplitude, Phase, and Polarization Control

Minatti, G.; Caminita, F.; Martini, Enrica; Sabbadini, M.; Maci, S.

doi:10.1109/tap.2016.2589969

Cited by 202 publications

(138 citation statements)

References 23 publications

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“…Metasurfaces have demonstrated in the past few years an exceptional ability to implement a myriad of electromagnetic functionalities, forming highly-efficient ultrathin devices for engineered beam refraction [1][2][3][4], reflection [5][6][7][8][9], focusing [10,11], polarization manipulation [12][13][14][15][16], controlled absorption [17][18][19], cloaking [20][21][22], and advanced radiation pattern molding [23][24][25][26][27][28], to name a few. These devices are typically designed by prescribing suitable continuous metasurface constituents (macroscopic design), implementing a desirable field transformation via the corresponding generalized sheet transition conditions (GSTCs) [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Properties of Metagratings via a Detailed Analytical Model for Synthesis and Analysis

2017

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We present detailed analytical modelling and in-depth investigation of wide-angle reflect-mode metagrating beam splitters. These recently introduced ultrathin devices are capable of implementing intricate diffraction engineering functionalities with only a single meta-atom per macro-period, making them considerably simpler to synthesize than conventional metasurfaces. We extend upon recent work and focus on electrically-polarizable metagratings, comprised of loaded conducting wires in front of a perfect elecric conductor, excited by transverse-electric polarized fields, which are more practical for planar fabrication. The derivation further relates the metagrating performance parameters to the individual meta-atom load, facilitating an efficient semianalytical synthesis scheme to determine the required conductor geometry for achieving optimal beam splitting. Subsequently, we utilize the model to analyze the effects of realistic conductor losses, reactance deviations, and frequency shifts on the device performance, and reveal that metagratings feature preferable working points, in which the sensitivity to these non-idealities is rather low. The analytical relations shed light on the physical origin of this phenomenon, associating it with fundamental interference processes taking place in the device. These results, verified via full-wave simulations of realistic physical structures, yield a set of efficient engineering tools, as well as profound physical intuition, for devising future metagrating devices, with immense potential for microwave, terahertz, and optical beam-manipulation applications.

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Section: Introductionmentioning

confidence: 99%

Unveiling the Properties of Metagratings via a Detailed Analytical Model for Synthesis and Analysis

2017

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“…Recent developments on the modeling of MTS antennas allow one to carry out an accurate control of the amplitude and phase of the aperture field with sub-wavelength patches printed on a grounded dielectric substrate [10]. However, the use of dielectric substrates might be limiting to withstand harsh environments in space applications [13], [14].…”

Section: Introductionmentioning

confidence: 99%

Additive Manufactured Metal-Only Modulated Metasurface Antennas

González‐Ovejero

Chahat

Sauleau

et al. 2018

IEEE Trans. Antennas Propagat.

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In metasurface (MTS) antennas, a surface-wave (SW) is gradually transformed into a leaky-wave (LW), owing to the SW interaction with a reactance tensor periodically modulated in the aperture plane. In such antennas, the modulated reactance is typically obtained by sub-wavelength patches printed on a dielectric substrate. As an alternative technology, we propose the use of a class of metal-only MTSs in the synthesis of the reactance tensor. The absence of dielectric is useful to withstand harsh environments in space applications. The proposed element consists of a metallic cylinder with elliptical cross-section, placed on a ground plane and arranged in a square lattice with subwavelength unit-cells. This structure is well suited for fabrication by metal additive manufacturing. We have applied the metal cylinders in the design of a right-handed circularly polarized (RHCP) antenna, with broadside pencil beam at Ka band. The obtained performance has been verified by full-wave simulations. A prototype has been successfully manufactured and measured, showing a good performance.

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“…In the transmitting case, this translates to radiation into unwanted directions; in the receiving case, it means that the incoming plane wave from the scan direction is partially reflected and scattered, rather than completely transformed into the guided-mode wave. Recently, synthesis of a desired leaky-wave radiation characteristics associated with a custom aperture field distribution is receiving an increased interest using spatially varying perturbation structures-the waveguide width and the metallic post interval in a substrate-integrated waveguide [3]; tensor sheet admittances in stacked metasurfaces on a ground plane [4]; and the shape, size, and periodicity of locally anisotropic unit cell in the form of printed conductor patches on a grounded dielectric substrate [5,6].…”

Section: Introductionmentioning

confidence: 99%

Near-perfect conversion of a propagating plane wave into a surface wave using metasurfaces

et al. 2018

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In this paper theoretical and numerical studies of perfect/nearly perfect conversion of a plane wave into a surface wave are presented. The problem of determining the electromagnetic properties of an inhomogeneous lossless boundary which would fully transform an incident plane wave into a surface wave propagating along the boundary is considered. An approximate field solution which produces a slowly growing surface wave and satisfies the energy conservation law is discussed and numerically demonstrated. The results of the study are of great importance for the future development of such devices as perfect leaky-wave antennas and can potentially lead to many novel applications.

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Synthesis of Modulated-Metasurface Antennas With Amplitude, Phase, and Polarization Control

Cited by 202 publications

References 23 publications

Unveiling the Properties of Metagratings via a Detailed Analytical Model for Synthesis and Analysis

Unveiling the Properties of Metagratings via a Detailed Analytical Model for Synthesis and Analysis

Additive Manufactured Metal-Only Modulated Metasurface Antennas

Near-perfect conversion of a propagating plane wave into a surface wave using metasurfaces

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