Multifunctional Vortex Beam Generation by a Dynamic Reflective Metasurface

Liu, Baiyang; He, Yejun; Wong, Sai‐Wai; Li, Yin

doi:10.1002/adom.202001689

Cited by 83 publications

(36 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 (c), the phase difference in transmission coefficients of the π/0 states remains stable at around π with very small deviation over a wide frequency band. However, the reflective phase difference of the reflective RMS is unstable [22].…”

Section: ) No Feed Occlusionmentioning

confidence: 99%

Uplink Transceiver Design and Optimization for Transmissive RMS Multi-Antenna Systems

Li¹,

Chen²,

Lu³

et al. 2021

Preprint

View full text Add to dashboard Cite

In this paper, a novel uplink communication for the transmissive reconfigurable metasurface (RMS) multi-antenna system with orthogonal frequency division multiple access (OFDMA) is investigated.Specifically, a transmissive RMS-based receiver equipped with a single receiving antenna is first proposed, and a far-near field channel model based on planar waves and spherical waves is given. Then, in order to maximize the system sum-rate of uplink communications, we formulate a joint optimization problem over subcarrier allocation, power allocation and RMS transmissive coefficient design. Due to the coupling of optimization variables, the optimization problem is non-convex, so it is challenging to solve it directly. In order to tackle this problem, the alternating optimization (AO) algorithm is used to decouple the optimization variables and divide the problem into two sub-problems to solve.First, the problem of joint subcarrier allocation and power allocation is solved via the Lagrangian dual decomposition method. Then, the RMS transmissive coefficient design can be obtained by applying difference-of-convex (DC) programming, successive convex approximation (SCA) and penalty function methods. Finally, the two sub-problems are iterated alternately until convergence is achieved. Numerical simulation results verify that the proposed algorithm has good convergence performance and can improve system sum-rate compared with other benchmark algorithms.

show abstract

Section: ) No Feed Occlusionmentioning

confidence: 99%

Uplink Transceiver Design and Optimization for Transmissive RMS Multi-Antenna Systems

Li¹,

Chen²,

Lu³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Metasurfaces have been extensively researched over recent years, owing to their extraordinary talents for the fine control over electromagnetic (EM) scattering [1][2][3][4][5]. Based on the advantages of low profile, low cost, and high integrity, metasurfaces have shown versatile potentials in many areas, such as dynamic scattering modulation [6,7], orbital angular momentum (OAM) beam generation [8][9][10], direct information transmission [11], energy harvesting [12], direction finding [13,14], and intelligent sensing [15,16]. Particularly, programmable metasurfaces have demonstrated their capacities in phase modulation for flexible beam forming through employing lumped components, which have exhibited significantly lower cost over conventional phased arrays using digital or analog phase shifters [17].…”

Section: Introductionmentioning

confidence: 99%

Time-Modulated Transmissive Programmable Metasurface for Low Sidelobe Beam Scanning

et al. 2022

View full text Add to dashboard Cite

Programmable metasurfaces have great potential for the implementation of low-complexity and low-cost phased arrays. Due to the difficulty of multiple-bit phase control, conventional programmable metasurfaces suffer a relatively high sidelobe level (SLL). In this manuscript, a time modulation strategy is introduced in the 1-bit transmissive programmable metasurface for reducing the SLLs of the generated patterns. After the periodic time modulation, harmonics are generated in each reconfigurable unit and the phase of the first-order harmonic can be dynamically controlled by applying different modulation sequences onto the corresponding unit. Through the high-speed modulation of the real-time periodic coding sequences on the metasurface by the programmable bias circuit, the equivalent phase shift accuracy to each metasurface unit can be improved to 6-bit and thus the SLLs of the metasurface could be reduced remarkably. The proposed time-modulated strategy is verified both numerically and experimentally with a transmissive programmable metasurface, which obtains an aperture efficiency over 34% and reduced SLLs of about −20 dB. The proposed design could offer a novel approach of a programmable metasurface framework for radar detection and secure communication applications.

show abstract

“…The proposal of the convolution theorem (Cui et al, 2016a) and the addition theorem (Wu et al, 2018) make it possible for RISs to form more advanced beam patterns. However, only the phase responses of the elements are considered while their amplitude responses are ignored in these metasurface designs (Cui et al, 2014) (Cui et al, 2016b) (Chen et al, 2018) (Wu et al, 2018) (Chen et al, 2019) (Liu et al, 2020) (Zhang et al, 2020) (Zhao et al, 2020) (Chen et al, 2021) (Huang et al, 2021) (Gao et al, 2021). In Ref.…”

Section: Introductionmentioning

confidence: 99%

Flexible Beam Manipulations by Reconfigurable Intelligent Surface With Independent Control of Amplitude and Phase

et al. 2022

View full text Add to dashboard Cite

Reconfigurable intelligent surfaces (RISs) have attracted extensive attention in recent years due to their strong ability to improve and customize electromagnetic wave propagation channels in wireless communications. In this article, we propose a design procedure for an RIS and its programmable element, whose reflection phase and amplitude can be jointly controlled by adjusting the states of the varactor and PIN-diode. In addition, by introducing metallic vias in the RIS element, the programmable element can maintain the stable reflection amplitude and phase responses under the illumination of transverse magnetic (TM) wave with the incident angle of 0–60°. In order to verify the beam steering performance of the RIS, theoretical calculations and full-wave simulations of single beam and dual beams are carried out according to the addition theorem of the complex reflection coefficient. The amplitude- and phase-coding patterns on the RIS array are well designed so that the deflection angles and power intensities of the scattered beams can be manipulated independently.

show abstract

Multifunctional Vortex Beam Generation by a Dynamic Reflective Metasurface

Cited by 83 publications

References 45 publications

Uplink Transceiver Design and Optimization for Transmissive RMS Multi-Antenna Systems

Uplink Transceiver Design and Optimization for Transmissive RMS Multi-Antenna Systems

Time-Modulated Transmissive Programmable Metasurface for Low Sidelobe Beam Scanning

Flexible Beam Manipulations by Reconfigurable Intelligent Surface With Independent Control of Amplitude and Phase

Contact Info

Product

Resources

About