Proceedings ArticleDOI
Liquid-crystal reconfigurable metasurface reflectors
Senglee Foo
- pp 2069-2070
TLDR
In this paper, an electronically beam-steerable flat reflector antennas using liquid-crystal-loaded metasurface was proposed, which can be reconfigured in real time to achieve effective beam collimation and beam steering by varying DC voltage distribution of the TTD cells.Abstract:
This paper presents concept of an electronically beam-steerable flat reflector antennas using liquid-crystal-loaded metasurface. Primary reflector of the proposed antenna concept utilizes metasurface comprising of a large number of reconfigurable true-time-delay (TTD) unit cells. Consequently, reflective phase of the metasurface reflector can be electronically reconfigured in real time to achieve effective beam collimation and beam steering by varying DC voltage distribution of the TTD cells.read more
Citations
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Journal ArticleDOI
Reconfigurable Intelligent Surfaces for Energy Efficiency in Wireless Communication
TL;DR: In this article, the authors developed energy-efficient designs for both the transmit power allocation and the phase shifts of the surface reflecting elements subject to individual link budget guarantees for the mobile users.
Posted Content
Reconfigurable Intelligent Surfaces for Energy Efficiency in Wireless Communication
TL;DR: The adoption of a reconfigurable intelligent surface (RIS) for downlink multi-user communication from a multi-antenna base station is investigated and the results show that the proposed RIS-based resource allocation methods are able to provide up to 300% higher energy efficiency in comparison with the use of regular multi-Antenna amplify-and-forward relaying.
Journal ArticleDOI
Toward Smart Wireless Communications via Intelligent Reflecting Surfaces: A Contemporary Survey
TL;DR: A literature review on recent applications and design aspects of the intelligent reflecting surface (IRS) in the future wireless networks, and the joint optimization of the IRS’s phase control and the transceivers’ transmission control in different network design problems, e.g., rate maximization and power minimization problems.
Proceedings ArticleDOI
Channel Estimation and Low-complexity Beamforming Design for Passive Intelligent Surface Assisted MISO Wireless Energy Transfer
Deepak Mishra,Håkan Johansson +1 more
TL;DR: A novel channel estimation protocol for PIS-assisted energy transfer (PET) from a multiantenna power beacon (PB) to a single-antenna energy harvesting (EH) user is presented.
Posted Content
Wireless Communications Through Reconfigurable Intelligent Surfaces
Ertugrul Basar,Marco Di Renzo,Julien de Rosny,Merouane Debbah,Mohamed-Slim Alouini,Rui Zhang +5 more
TL;DR: The fundamental differences with other technologies, the most important open research issues to tackle, and the reasons why the use of reconfigurable intelligent surfaces necessitates to rethink the communication-theoretic models currently employed in wireless networks are elaborated.
References
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Journal ArticleDOI
An Overview of the Theory and Applications of Metasurfaces: The Two-Dimensional Equivalents of Metamaterials
Christopher L. Holloway,Edward F. Kuester,Joshua A. Gordon,John F. O'Hara,James C. Booth,David R. Smith +5 more
TL;DR: Metamaterials are typically engineered by arranging a set of small scatterers or apertures in a regular array throughout a region of space, thus obtaining some desirable bulk electromagnetic behavior as mentioned in this paper.
Journal Article
Liquid Crystal Based Reconfigurable Reflectarray Antenna Design
Muhammad Ismail,M. Inam +1 more
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