An arbitrarily curved acoustic metasurface for three-dimensional reflected wave-front modulation

Li, Xiaoshuang; Wang, Yanfeng; Chen, A‐Li; Wang, Yue-Sheng

doi:10.1088/1361-6463/ab7327

Cited by 28 publications

(12 citation statements)

References 57 publications

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“…As for the manipulation of transmitted acoustic waves, acoustic metasurfaces made of metal units with four Helmholtz resonators and a single slit in Figure 5(c) and various cavity depths in Figure 5(f) enable wide effective bandwidth with excellent impedance matching and high transmission efficiency [55,58,109]. Analytical, numerical and experimental results indicate that several types of anomalous wavefront manipulations can be achieved using Helmholtz resonators, such as non-diffracting Bessel beam [55], cloaking [110,111], propagating-to-surface wave conversion [54], bi-anisotropic wavefront transformation [112,113], and cylindrical-to-plane wave conversion [55] in two and three-dimensional space [29].…”

Section: Acoustic Metasurface With Helmholtz Resonatorsmentioning

confidence: 99%

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Recent progress in acoustic metamaterials and active piezoelectric acoustic metamaterials - A review

Huber

2022

Applied Materials Today

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Section: Acoustic Metasurface With Helmholtz Resonatorsmentioning

confidence: 99%

“…2019 Ju [28] Introduced the geometry curvature effect into AM structures. 2020 Li [29] Designed curved AMs for reflected wave-front modulation in three-dimensional space.…”

Section: Yearmentioning

confidence: 99%

Recent progress in acoustic metamaterials and active piezoelectric acoustic metamaterials - A review

Huber

2022

Applied Materials Today

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“…Car doors are, in general, conformal surfaces that cannot be considered as EM flat at mmWave/sub-THz frequencies. Conformal metasurfaces have been investigated in [30]- [32] for acoustic wave and light manipulation, but never at radio frequency and for vehicular applications.…”

Section: Contributionsmentioning

confidence: 99%

Conformal Metasurfaces: a Novel Solution for Vehicular Communications

Mizmizi¹,

Ayoubi²,

Tagliaferri³

et al. 2022

Preprint

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In future 6G millimeter wave (mmWave)/sub-THz vehicle-to-everything (V2X) communication systems, vehicles are expected to be equipped with massive antenna arrays to realize beam-based links capable of compensating for the severe path loss. However, vehicle-to-vehicle (V2V) direct links are prone to be blocked by surrounding vehicles. Emerging metasurface technologies enable the control of the electromagnetic wave reflection towards the desired direction, enriching the channel scattering to boost communication performance. Reconfigurable intelligent surfaces (RIS), and mostly the pre-configured counterpart intelligent reflecting surfaces (IRS), are a promising low-cost relaying system for 6G. This paper proposes using conformal metasurfaces (either C-RIS or C-IRS) deployed on vehicles' body to mitigate the blockage impact in a highway multi-lane scenario. In particular, conformal metasurfaces create artificial reflections to mitigate blockage by compensating for the non-flat shape of vehicle's body, such as the lateral doors, with proper phase patterns. We analytically derive the phase pattern to apply to a cylindrical C-RIS/C-IRS approximating the shape of car body, as a function of both incidence and reflection angles, considering cylindrical RIS/IRS as a generalization of conventional planar ones. We propose a novel design for optimally pre-configured C-IRS to mimic the behavior of an EM flat surface on car doors, proving the benefits of C-RIS and C-IRS in a multi-lane V2V highway scenario. The results show a consistent reduction of blockage probability when exploiting C-RIS/C-IRS, 20% for pre-configured C-IRS and 70% for C-RIS and, as well as a remarkable improvement in terms of average signal-to-noise ratio, respectively 10 − 20 dB for C-IRS and 30 − 40 dB for C-RIS. I. INTRODUCTION Road mobility is experiencing an unprecedented technological transformation towards safer and efficient vehicular networks. Vehicle-to-everything (V2X) communication and autonomous guidance technologies are the main engines driving innovation and the development of novel

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“…Although the conventional RIS technology has been proposed for EM waves, recently acoustic RISs have been introduced, cf. [42], [43]. The primary scope of these works was the cloaking of uneven surfaces to avoid the scattering and improve the ambient sound.…”

Section: B Alternative Signaling Technologiesmentioning

confidence: 99%

Reconfigurable Intelligent Surfaces in Challenging Environments: Underwater, Underground, Industrial and Disaster

Kisseleff,

Chatzinotas,

Ottersten

2020

Preprint

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Reconfigurable intelligent surfaces (RISs) have been introduced to improve the signal propagation characteristics by focusing the signal power in the preferred direction, thus making the communication environment 'smart'. The typical use cases and applications for the 'smart' environment include beyond 5G communication networks, smart cities, etc. The main advantage of employing RISs in such networks is a more efficient exploitation of spatial degrees of freedom. This advantage manifests in better interference mitigation as well as increased spectral and energy efficiency due to passive beam steering.Challenging environments (CEs) comprise a range of scenarios, which share the fact that it is extremely difficult to establish a communication link using conventional technology due to many impairments typically associated with the propagation medium and increased signal scattering. Although the challenges for the design of communication networks in such environments are known, there is no common enabler or solution for all these applications. Interestingly, the use of RISs in such scenarios can become such an enabler and a game changer technology. Surprisingly, the benefits of RIS for wireless networking in underwater and underground medium as well as in industrial and disaster environments have not been addressed yet. This paper aims at filling this gap by providing a motivation for the application of RISs in CEs. In addition, novel research challenges to be addressed in this context are discussed.Index Terms-Reconfigurable intelligent surfaces, challenging environments, underground, underwater, industrial, emergency networks, Internet of Things I. INTRODUCTIONR ECONFIGURABLE intelligent surfaces (RISs) is a promising technology, which has been motivated by the increasing demands of wireless networks beyond 5G [1]. RISs are intelligently designed artificial planar structures with reconfigurable properties enabled via integrated electronic circuits. These electronic circuits can be programmed to reflect an impinging electromagnetic (EM) wave in a controlled manner, thus making the communication environment controllable and smart. RISs are manufactured with low-profile and light weight using inexpensive materials and can be deployed on a variety of surfaces, such as facades of buildings, walls, ceilings, etc. [2]. The signal propagation from transmitters to receivers can therefore be assisted by steering the RIS-reflected signals in directions that enhance the signal quality, suppress cochannel interference and consequently improve the spectral efficiency. The corresponding performance gains of RISassisted networks compared to current wireless systems are well-known from the previous works in this domain [3]. Furthermore, co-channel interference can be reduced or avoided by choosing different propagation paths for the interfering signals. This is important in urban environments with dense deployment of terminals, cf. [4].Challenging environment (CE) refers to a communication environment, in which the signal propagati...

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An arbitrarily curved acoustic metasurface for three-dimensional reflected wave-front modulation

Cited by 28 publications

References 57 publications

Recent progress in acoustic metamaterials and active piezoelectric acoustic metamaterials - A review

Recent progress in acoustic metamaterials and active piezoelectric acoustic metamaterials - A review

Conformal Metasurfaces: a Novel Solution for Vehicular Communications

Reconfigurable Intelligent Surfaces in Challenging Environments: Underwater, Underground, Industrial and Disaster

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