Transparent Metasurface for Generating Microwave Vortex Beams with Cross-Polarization Conversion

Shi, Hongyu; Wang, Luyi; Zhao, Mengran; Chen, Juan; Zhang, Anxue; Xu, Zhuo

doi:10.3390/ma11122448

Cited by 26 publications

(15 citation statements)

References 29 publications

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“…The polarization state of EM wave can be set as a convenient switch to alter the different output wavefronts generated by bi-functional meta-devices. In Reference [77], the authors designed a multilayer unit cell that was inspired from the patch antenna (Figure 13a). The unit cell has five metallic layers and four dielectric layers.…”

Section: Transmissive Metasurfacesmentioning

confidence: 99%

A Review of Orbital Angular Momentum Vortex Beams Generation: From Traditional Methods to Metasurfaces

et al. 2020

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In this paper, we review the generation of vortex beams carrying orbital angular momentum in the microwave domain. We firstly present the theory of Laguerre–Gaussian beams where it is demonstrated that they carry such type of momentum. We further provide an overview of the classical methods used to generate orbital angular momentum vortex beams, which rely on two main methods; plane wave to vortex wave conversion and direct generation using radiating antennas. Then, we present recent progress in the physics of metasurfaces devoted to the generation of vortex beams with a discussion about reflective and transmissive metasurfaces for plane wave to vortex wave conversion as well as methods to reduce the intrinsic divergence characteristics of vortex beams. Finally, we conclude on this rapidly developing research field.

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Section: Transmissive Metasurfacesmentioning

confidence: 99%

A Review of Orbital Angular Momentum Vortex Beams Generation: From Traditional Methods to Metasurfaces

et al. 2020

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“…Metamaterial is a periodic array of artificially designed metallic structures which has the ability to change equivalent material properties such as permittivity, permeability, and refractive index. It brings new thoughts and solutions to various fantastic applications, such as absorbing materials, dimensional miniaturization, invisibility cloaks, perfect lens, resonant cavity, polarization transformer, coupler, and many other antenna applications …”

Section: Introductionmentioning

confidence: 99%

A novel miniaturized metamaterial lens antenna

Luo

Sang

Tan

et al. 2020

Int J RF Microw Comput Aided Eng

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This article develops a flat, miniaturized lens based on metamaterial for antenna gain improvement. The overall size of the lens is 1.9λ0 × 1.9λ0 × 0.05λ0. The distance between the metamaterial lens and the antenna is only about 0.4λ0. The prototype lens antenna is fabricated and the measured results are in agreement with the simulated results. It shows that the proposed lens provides significant gain enhancement by 2 to 3.5 dB between 1.3 and 1.45 GHz, which effectively demonstrate a high directivity, miniaturized, and compact metamaterial lens antenna.

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“…In such a system, we should not only focus on the transmission wave, but also on the reflection wave. Some methods have been proposed to enhance the transmission amplitude and realize a high efficiency of the designed meta-device [33][34][35][36][37][38]. However, these meta-atoms are seriously restricted to narrow bandwidths.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Transmissive Broadband Vortex Beam Generator Based on Pancharatnam–Berry Metasurface

et al. 2020

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Vortex beam generators, particularly those operating in transmission mode, are extremely important in modern communication systems because they are believed to be an effective way to extend the capacity of a communication channel. However, current approaches have suffered from complex configurations, fixed operation modes, and low efficiency, particularly in a transmissive case. In this study, we propose a new strategy for improving the transmissive amplitude and bandwidth of metasurfaces by optimizing microstructures with a non-uniform thickness based on the transfer matrix method (TMM). As a result, our designed meta-atom can achieve a high transmission of greater than 0.9 within a wide frequency interval of 12.6-16.2 GHz. As a proof of concept, we designed a vortex beam generator with topological charge l = 1 using the designed meta-atom. We conducted near-and far-field experiments to characterize its performance, indicating that our meta-device can realize a pure vortex beam with an efficiency of higher than 82.1% at a central frequency of 15 GHz. Our findings will lay a theoretical foundation for studies on metasurfaces with a non-uniform thickness and provide a way to design high-performance meta-devices with broad bandwidths.

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Transparent Metasurface for Generating Microwave Vortex Beams with Cross-Polarization Conversion

Cited by 26 publications

References 29 publications

A Review of Orbital Angular Momentum Vortex Beams Generation: From Traditional Methods to Metasurfaces

A Review of Orbital Angular Momentum Vortex Beams Generation: From Traditional Methods to Metasurfaces

A novel miniaturized metamaterial lens antenna

High-Performance Transmissive Broadband Vortex Beam Generator Based on Pancharatnam–Berry Metasurface

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