A Convolution-Based Coding Metasurface for Wide-Angle Beam Steering for Enhanced 5G Wireless Communications

Materials, Journal Year: 2025, Volume and Issue: 18(9), P. 1913 - 1913

Published: April 23, 2025

With the rapid development of 5G communication technology, there is an increasing demand for high-performance antennas and beam control technologies, making novel metamaterial structures capable precise electromagnetic wave manipulation a current research hotspot. This paper presents coding metasurface specifically designed applications, operating at frequency 3.5 GHz. The design employs unique annular unit structure achieving both single-beam dual-beam functionalities. Through convolution operations, over reflection angle achieved, with adjustable range from 51.5° to 17.5° resolution 10°. overcomes inherent limitations traditional gradient methods, providing comprehensive framework wide-angle in design. results demonstrate that can effectively direction waves GHz, exhibiting dual-polarization modulation capabilities maintaining stable performance under oblique incidence conditions within 20°. Experimental validation confirms functionality real-world environments, highlighting its potential enhance signal reception sensitivity transmission efficiency wireless communications. work opens new avenues reconfigurable intelligent metasurfaces, applications extending beyond future 6G networks Internet Things (IoT) systems.

Language: Английский

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Nonlinear Information Metasurface for Second-Harmonic Generation, Manipulation, and Backscatter Communication

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: 17(19), P. 28752 - 28763

Published: May 5, 2025

In the microwave spectrum, emergence of metamaterials has paved a pathway for direct conversion spatial waves into frequency-multiplication harmonics. However, despite attractive physical discoveries, practical application these harmonics not been well explored. Here, we propose nonlinear information metasurface (IMS) harmonic generation and demonstrate its in backscatter communication (BackCom). The IMS consists an array passive meta-atoms controlled by digital module, which can multiply frequency incident wave dynamically tailor phase generated second (SH). A prototype is fabricated, relatively high frequency-conversion efficiency real-time controllable SH scattering performances are validated experimentally. BackCom system, key roles beam-steering modulation demonstrated, showcasing binary quadrature shift keying schemes directly on carrier wave. Given that backscattered signals operate separate channels, presents promising solution with enhanced reduced interference, particularly context increasingly congested spectrum today.

Language: Английский

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High‐Resolution Phase‐Magnitude‐Decoupled Information Metasurface for Complex Beamforming and Dual Channel 16QAM Secure Communication

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 15, 2025

Abstract Information metasurfaces have attracted considerable attention due to their remarkable ability tailor electromagnetic (EM) waves flexibly. However, it is still challenging achieve high‐resolution phase‐magnitude‐decoupled modulations with high integration and more degrees of freedom in 2D. In this work, a low‐profile information metasurface (PMDIM) proposed that enables independent controls both phase magnitude. By precisely applying different bias voltages two groups PIN diodes the PMDIM unit cell, 2‐bit responses continuous magnitude control ranging from 0.2 1 across wide bandwidth are achieved unit‐by‐unit manner, offering 2D capability for EM manipulations. For validation, combined carefully optimized phase‐magnitude coding sequences realize functions: complex beamforming dual‐channel 16QAM secure communication. The first function includes single‐beam steering low sidelobes, dual‐beam power allocation, multi‐beam steering; while second enhances capacity physical layer security wireless systems. Measured results demonstrate excellent performance PMDIM, showing significant potentials modern radar communications.

Language: Английский

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High‐Efficiency and Full‐Space Indoor Holographic Communication System Assisted by Complex‐Amplitude Metasurface

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 22, 2025

Abstract As there is a diversification in indoor communication scenarios, metasurfaces with complex‐amplitude modulation show great potential for improving performances. However, still face challenges achieving efficient full‐space coverage, multi‐channel communication, and system integration. Here, frequency‐spatial multiplexed metasurface design strategy proposed communications. By adjusting the structural parameters orientation angles of meta‐atoms, amplitude phase across five channels are jointly tailored, enabling precise wave manipulation to enhance quality within coverage area. Additionally, designed utilized an generate different holographic images at specific frequencies distances, allowing point‐to‐point terminals receive signals perform functions. Meanwhile, ultrathin structure single‐layer substrate cladded by two patterned metal layers facilitates high‐density integration devices. Numerical simulations experimental results validate five‐channel imaging, demonstrating its wide‐area wireless data transmission applications, providing new directions future technologies.

Language: Английский

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Amplitude‐Phase Independently Encoding Space‐Division Multiplexed Wireless Communication Using Beamforming Reconfigurable Metasurfaces

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(28)

Published: Aug. 8, 2024

Abstract Wireless communications utilizing reconfigurable metasurfaces have garnered significant attention due to their capability transmit information without traditional radio‐frequency chains. Space‐division multiplexing techniques, in particular, can be utilized improve channel capacity. However, most of them are only implemented through either amplitude or phase encoding. Here, a space‐division multiplexed wireless communication system with amplitude‐phase independent encoding is proposed. By designing dual beams varying power intensity ratios, channels that allow for modulation established. The between the two independently modulated based on pattern synthesis algorithm. using nulling technique, and achieved each channel. Compared amplitude‐only modulation, offers an additional degree freedom carrier wave which not increases capacity but also enhances physical layer security directional (DM) techniques. To demonstrate this approach, sixteen scattering generated beamforming metasurface, dual‐channel 4 phase‐shift keying (4APSK) experimentally realized. This work paves way establishing multiple channels, potentially applicable multi‐user communications.

Language: Английский

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