Ultrawideband Metasurface Lenses Based on Off-Shifted Opposite Layers

Quevedo–Teruel, Oscar; Ebrahimpouri, Mahsa; Kehn, Malcolm Ng Mou

doi:10.1109/lawp.2015.2492678

Cited by 156 publications

(110 citation statements)

References 17 publications

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“…As a result, reduced frequency dispersion is obtained over a large range of frequency for modes having high equivalent refractive indexes. This phenomenon was recently reported in one-dimensional structures [26], [27], and extended to 2D-periodic configurations in [13]. These atttractive features could have broad applications in metamaterial design and synthesis.…”

Section: Glide-symmetric Corrugated Waveguidesupporting

confidence: 65%

“…It has been recently demonstrated in [13] that these disadvantages can be overcome by using all-metallic metasurfaces in a PPW. In order to increase the bandwidth of operation and the equivalent refractive index range, glide symmetry may be employed.…”

Section: Introductionmentioning

confidence: 99%

“…Since the interesting properties of glide symmetry structures have only been recently discovered [13], [15], specific analysis methods have not yet been proposed. In fact, modeling of these types of structures imposes fundamental limitations due to the presence of geometrical details at different scales: thin PPW slabs and relatively large inclusions (corrugations, pins or holes).…”

Section: Introductionmentioning

confidence: 99%

“…In fact, modeling of these types of structures imposes fundamental limitations due to the presence of geometrical details at different scales: thin PPW slabs and relatively large inclusions (corrugations, pins or holes). This contrast in scales is required to obtain UWB performance in 2D-lenses [13] and is a requirement in gap waveguide technology [3], [15]. These fundamental limitations are due to the close spacing of the textured plates, leading to the interaction of high-order Floquet modes and a complex field distribution on the metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Accurate Equivalent-Circuit Descriptions of Thin Glide-Symmetric Corrugated Metasurfaces

Valerio

Šipuš

Grbic

et al. 2017

IEEE Trans. Antennas Propagat.

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Thin artificial surfaces that act as high frequency band-gap structures have been recently studied for the design of gap waveguides, hard surfaces, and planar lenses. Here, we propose a circuit-based method to analyse glide-symmetric corrugated metasurfaces that are embedded in a thin parallel plate waveguide. Our closed-form solution is based on rigorous analytical derivations. It achieves remarkable agreement with full-wave solvers, even when the waveguide thickness is extremely thin. In contrast, classical homogenization approaches are shown to be inaccurate for thin waveguides due to the interaction of higher-order Floquet modes between the surfaces. Numerical results validate our theoretical analysis and show the utility of the proposed method.

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Section: Glide-symmetric Corrugated Waveguidesupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Accurate Equivalent-Circuit Descriptions of Thin Glide-Symmetric Corrugated Metasurfaces

Valerio

Šipuš

Grbic

et al. 2017

IEEE Trans. Antennas Propagat.

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“…Some of these methods are drilling sub-wavelength holes in a sufficiently high refractive index substrate [4,6,7], suspension polymerization technique [8,9], dielectric layered shell deposition [10][11][12], ion-exchange method on optical glasses [13], parallel waveguide plate height modification for mode index alteration [14][15][16], modification of the guiding silicon substrate height [17,18], graded photonic crystals [19][20][21][22] and electron-beam lithography (EBL) [18,[23][24][25][26]. Alternatively, mushroom structures [27], bed of nails [28,29], holey structures [30] and non-uniform metallic patches over a dielectric layer [31] are tested and verified in the microwave regime to provide variable refractive index over a spatial region.…”

Section: Introductionmentioning

confidence: 99%

Elliptical generalized Maxwell fish-eye lens using conformal mapping

et al. 2019

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A circular graded index lens is conformally transformed to an elliptical shape using a closed-form transformation. The proposed transformation is then employed to compress a Maxwell fish-eye and its generalized version. Since the transformation is conformal, the electromagnetic properties of the device are perfectly preserved after the transformation with fully isotropic and dielectriconly materials. Ray-tracing and full-wave simulations are carried out for several cases to verify the functionality of the optically transformed lenses in geometrical optics and wave optics regimes.

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Conditional Generative Adversarial Networks for Inverse Design of Multifunctional Metasurfaces

Kiani

Kiani²,

Zolfaghari

2022

Advanced Photonics Research

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Electromagnetic (EM) metasurfaces can present a versatile platform for realization of multiple diverse EM functionalities with incident wave frequency, polarization, or propagation direction through appropriate choice of unit cells structures. However, the inverse design of multifunctional metasurfaces relies on massive full‐wave EM numerical simulations to obtain an optimized solution. Herein, a step‐by‐step procedure based on conditional generative adversarial networks (cGANs) integrated with Gramian angular fields (GAFs) to reduce the computational time required for the EM simulations in the inverse design of multifunctional microwave metasurfaces is proposed. The proposed procedure initially implements GAFs to encode the desired multiobjective scattering parameters (SPs) to images and then passes them through the cGAN model to map them to three‐layer metasurfaces. The present study uses a robust dataset, including 54 000 metasurface structures and corresponding SPs to train and validate the cGAN model. This article also presents two case study examples using two multifunctional metasurfaces with different independent functionalities and full‐space coverage to justify the performance of the proposed procedure in the inverse design of multifunctional microwave metasurfaces. The case studies demonstrate that, despite the random nature of the training data samples, the cGAN reliably predicts the corresponding metasurfaces of the desired multiobjective SPs.

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Ultrawideband Metasurface Lenses Based on Off-Shifted Opposite Layers

Cited by 156 publications

References 17 publications

Accurate Equivalent-Circuit Descriptions of Thin Glide-Symmetric Corrugated Metasurfaces

Accurate Equivalent-Circuit Descriptions of Thin Glide-Symmetric Corrugated Metasurfaces

Elliptical generalized Maxwell fish-eye lens using conformal mapping

Conditional Generative Adversarial Networks for Inverse Design of Multifunctional Metasurfaces

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