High-Gain Broadband Millimeter-Wave Multidimensional Metasurface for Generating Two Independent Vortex Waves

Liu, Baiyang; Li, Yin; Rashid, Amir; Jiang, Xiaonan; Wong, Sai‐Wai; Zhang, Xiao; Tam, Kam‐Weng

doi:10.1109/tap.2022.3177563

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…The 180°phase change with a tolerance of ±30°can be explained by equivalent circuit model of the meta-atom. A conducting plate with a thin dielectric medium can be considered as a LC resonator, the reflection coefficient Γ can be expressed by 47 :…”

Section: Meta-atommentioning

confidence: 99%

Multi-diverse metasurfaces for fast wide-angle sensing and through-wall imaging

Wong

Liu

2023

Preprint

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Multi-diverse metasurfaces play a crucial role in enhancing the capacity of sensing, radar, imaging, and communication systems through electromagnetic wave manipulation across different diversity controls. Currently, the primary approach for achieving multidimensional manipulation is through the use of dynamic metasurfaces. However, this method has drawbacks when it comes to fast sensing and imaging because of limitations in pattern switching speed. To address this issue, we propose a novel microwave-to-millimeter-wave meta-atom that provides polarization and frequency diversities. The meta-atoms formed in an array with a disordered permutation enable a wide-angle near-field fast sensing for tracking the moving trajectory of an object. Moreover, employing a dispersion-engineered strategy to arrange the meta-atoms in an array allows for high-gain through-wall imaging, enabling the detection of a sparse object with varying shapes and positions. The achieved result confirms that the proposed technology paves the way for developing multi-diverse metasurfaces that possess fast detecting and through-wall imaging capabilities. This breakthrough creates opportunities for identifying previously unseen modalities, and opens up new possibilities in various applications such as autonomous vehicles, all-weather sensing in surveillance, and radar integrated communication systems in 6G and beyond.

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Section: Meta-atommentioning

confidence: 99%

Multi-diverse metasurfaces for fast wide-angle sensing and through-wall imaging

Wong

Liu

2023

Preprint

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“…4 Phase gradient metasurfaces (MSs) have also been widely used to generate OAM wave due to their unique properties of low profile, easy fabrication, high efficiency, and low cost. [5][6][7][8][9][10][11] However, it is difficult to obtain multifunctional OAM beams with arbitrary direction, polarization and OAM mode by the conventional technique. The THIMS provide a good solution.…”

Section: Introductionmentioning

confidence: 99%

“…Phased array antennas (usually circular arrays) were utilized for the generation of OAM radiation 4 . Phase gradient metasurfaces (MSs) have also been widely used to generate OAM wave due to their unique properties of low profile, easy fabrication, high efficiency, and low cost 5–11 . However, it is difficult to obtain multifunctional OAM beams with arbitrary direction, polarization and OAM mode by the conventional technique.…”

Section: Introductionmentioning

confidence: 99%

High efficiency holographic impedance metasurface for dual circular polarized OAM waves

Huang,

Xiang

2024

Micro & Optical Tech Letters

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This paper proposes a high aperture efficiency (AE) small size tensor holographic impedance metasurface (THIMS), which has the ability to create circular polarized (CP) high purity orbital angular momentum (OAM) multi‐beams with flexibly independent control of the individual beam direction, polarization and OAM mode. The tensor unit cell is a cross‐slotted circular patch. We design a THIMS at 14.6 GHz for dual CP OAM beams: Beam‐I (LHCP, l = 1, θ1 = 30°, φ1 = 0°), Beam‐II (RHCP, l = −1, θ2 = 30°, φ2 = 180°). The developed tensor dual CP THIMS has the following advantages: high purity in xoy plane at z = 9.73 λ (λ wavelength, measured purity 88.4% for Beam‐I, and 93.5% for Beam‐II), high AE 25.1%, and small size 5.986 λ × 5.986 λ × 0.0618 λ. The calculated, simulated and measured results agree well. The generated dual CP OAM beams have potential applications for high‐capacity wireless communication, radar high resolution imaging, and rotation velocity measurement.

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“…On the other hand, a wide bandwidth in vortex beams can reduce the distortion caused by chromatic dispersion as well as develop some new applications [ 22 , 23 , 24 ]. Hence, there are some recent studies and reports on broadband vortex beam generators [ 25 , 26 , 27 , 28 , 29 , 30 ]. For instance, Guo et al design a reconfigurable metasurface with the octagonal ring slot structure, which aims to produce vortex beams with multiple different OAM modes in a broad operation band.…”

Section: Introductionmentioning

confidence: 99%

A Broadband Vortex Beam Generator Based on Single-Layer Hybrid Phase-Turning Metasurface

Zhao

et al. 2023

Micromachines

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Vortex beams carrying orbital angular momentum (OAM) have become a research frontier due to the prospect of improving spectral efficiency and transmission capacity in communication systems. In this work, a hybrid phase-turning meta-atom that combines resonance and geometric (Pancharatnam-Berry) phase modulation is used to form a single-layer metasurface. A linearly polarized broadband vortex beam of mode l = −1 is obtained by the metasurface. An experimental prototype of the vortex beam generator has been fabricated and measured. The simulated and measured results demonstrate that the whole vortex beam generator exhibits over 70% mode purity from 26.5 GHz to 40 GHz (the relative bandwidth is 38.57%). In addition, a wide 3 dB gain bandwidth and low crosstalk are also provided by the proposed generator. This indicates that the proposed generator has important application value for vortex beam communication and its related applications.

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High-Gain Broadband Millimeter-Wave Multidimensional Metasurface for Generating Two Independent Vortex Waves

Cited by 7 publications

References 29 publications

Multi-diverse metasurfaces for fast wide-angle sensing and through-wall imaging

Multi-diverse metasurfaces for fast wide-angle sensing and through-wall imaging

High efficiency holographic impedance metasurface for dual circular polarized OAM waves

A Broadband Vortex Beam Generator Based on Single-Layer Hybrid Phase-Turning Metasurface

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