Angular and Polarization Stability of Broadband Reconfigurable Intelligent Surfaces of Binary Type

Shabanpour, Javad; Simovski, Constantin

doi:10.1109/access.2022.3226264

Cited by 23 publications

(4 citation statements)

References 92 publications

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“…In [36], authors delves into the design and evaluation of a binary type RIS for broadband applications. This RIS, composed of a grid of Jerusalem crosses, aims to maintain stable reflection phase frequency dispersion (RPFD) over various angles and polarizations.…”

Section: ) Lumped Elements Based Rismentioning

confidence: 99%

Going Beyond a Simple RIS: Trends and Techniques Paving the Path of Future RIS

Shafique,

Alhassoun

2024

IEEE Open J. Antennas Propag.

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To have uninterrupted wireless connectivity, higher throughput, and latency rate down to nanoseconds; future networks will rely heavily on higher frequency bands, yet these signals suffer from attenuation and can be easily blocked by objects. Hence, those signals lose strength over longer distances significantly compared to their low-frequency counterparts. To overcome these constraints, reconfigurable intelligent surfaces (RIS) can increase the wireless network capacity and coverage by consciously altering the wireless propagation environment, which makes them one of the key enablers of the 6G communication networks. The potential benefits of RIS-assisted communication systems can be effectively increased using machine learning (ML) to pave the path towards Wireless 2.0, having a vision of digitization, programmability, and intelligence. This paper reviews recent developments in RIS technology with a special emphasis on tuning techniques, hardware concepts, RIS empowered by artificial intelligence techniques, and applications for next generation of networks. Finally, a viewpoint on the difficulties and potential directions of intelligent metasurfaces are also presented.

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Section: ) Lumped Elements Based Rismentioning

confidence: 99%

Going Beyond a Simple RIS: Trends and Techniques Paving the Path of Future RIS

Shafique,

Alhassoun

2024

IEEE Open J. Antennas Propag.

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“…This type of meta-atoms allows to achieve reliable angular stability, see e.g. [20]- [22]. The discretization step of the structure along the z-axis is λ0/10.…”

Section: B Three-channel Splittermentioning

confidence: 99%

Molding of Reflection and Scattering From Uniform Walls Using Space-Periodic Metasurfaces

Kosulnikov,

Cuesta,

Wang

et al. 2024

IEEE Trans. Antennas Propagat.

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Active development is taking place in reconfigurable and static metasurfaces that control and optimize reflections. However, existing designs typically only optimize reflections from the metasurface panels, neglecting interference with reflections originating from supporting walls and nearby objects. In this study, we investigate how engineering the metasurface properties can modify the total scattering pattern, enabling the modification and optimization of reflections from significantly larger illuminated areas than the metasurface panel. To accomplish this, a general design approach is developed to create periodical metasurfaces with controlled reflection phase and amplitude for all propagating Floquet harmonics. By combining metasurface reflections with those from the surrounding walls, the total scattering can be manipulated. The study demonstrates how appropriately designed metasurfaces can modify reflections from surrounding walls, enhancing the functionalities of metasurfaces. These findings are intended to facilitate advancements in engineering and optimizing wave propagation channels, particularly for millimeter-wave communications.

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“…Therefore, the meta-element will exhibit different reflection features under the TE and TM oblique incidences. For TE and TM oblique incidences, the reflection coefficients of metasurface are different, and can be expressed as [42]…”

Section: Appendix a Schematics Of Meta-elementmentioning

confidence: 99%

Programmable metasurfaces with high angular stability for arbitrarily-polarized obliquely-incident waves

Xu,

Zhang,

et al. 2024

J. Phys. D: Appl. Phys.

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Programmable metasurfaces show enormous potential in real-time electromagnetic (EM) manipulation and their stable responses for variable EM waves including incident angle and polarization changes is crucial for related applications. However, the demonstrated programmable metasurfaces are commonly considered in normal-incident wave with fixed polarization; how to achieve stable performance in more realistic scenarios of wide-angle and full-polarized wave incidences is still a challenge. Here, we propose and realize a wide-angle and full-polarization programmable metasurface, which can generate stabilized amplitude and phase responses at both transverse electric (TE) and transverse magnetic (TM) oblique incidences. These are achieved by introducing the metallic walls around the metasurface element to reduce element coupling, which greatly improves the angular stability of its reflection responses. The mechanisms of angular insensitivity are analyzed comprehensively, and as a proof of concept, the obliquely-incident beam steering, large-angle beam scanning and oblique vortex beam emitting are demonstrated on this programmable metasurface. Both the simulation and experimental results demonstrate that the programmable metasurface can operate well at both TE and TM wide-angle oblique incidences in the upper half space. Our work offers an actual route for improving the angular stability and polarization insensitivity of metasurface, which could push it one step closer towards more complicated applications.

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Angular and Polarization Stability of Broadband Reconfigurable Intelligent Surfaces of Binary Type

Cited by 23 publications

References 92 publications

Going Beyond a Simple RIS: Trends and Techniques Paving the Path of Future RIS

Going Beyond a Simple RIS: Trends and Techniques Paving the Path of Future RIS

Molding of Reflection and Scattering From Uniform Walls Using Space-Periodic Metasurfaces

Programmable metasurfaces with high angular stability for arbitrarily-polarized obliquely-incident waves

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