A Novel Electronically Controlled Two-Dimensional Terahertz Beam-Scanning Reflectarray Antenna Based on Liquid Crystals

Yang, Jun; Wang, Pengjun; Sun, Shuangyuan; Liu, Ying; Yin, Zhiping; Deng, Guangsheng

doi:10.3389/fphy.2020.576045

Cited by 10 publications

(2 citation statements)

References 27 publications

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“…In addition, when the operating frequency is in the millimeter-wave band, the MEMS switches become a promising alternative to the PIN diodes, since the latter may introduce larger insertion losses. Moreover, REs loaded with liquid crystal [51,52] and graphene [53,54] also exhibit good performance.…”

Section: An Implementation Of Rismentioning

confidence: 99%

Reconfigurable intelligent surfaces for smart wireless environments: channel estimation, system design and applications in 6G networks

Liang

Chen

Long

et al. 2021

Sci. China Inf. Sci.

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Reconfigurable intelligent surface (RIS), one of the key enablers for the sixth-generation (6G) mobile communication networks, is considered by designers to smartly reconfigure the wireless propagation environment in a controllable and programmable manner. Specifically, an RIS consists of a large number of low-cost and passive reflective elements (REs) without radio frequency chains. The system gain of RIS wireless systems can be achieved by adjusting the phase shifts and amplitudes of the REs so that the desired signals can be added constructively at the receiver. However, an RIS typically has limited signal processing capability and cannot perform active transmitting/receiving in general, which leads to new challenges in the physical layer design of RIS wireless systems. In this paper, we provide an overview of the RIS-aided wireless systems, including the reflection principle, channel estimation, and system design. In particular, two types of emerging RIS systems are considered: RIS-aided wireless communications (RAWC) and RISbased information transmission (RBIT), where the RIS plays the role of the reflector and the transmitter, respectively. We also envision the potential applications of RIS in 6G networks.

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Section: An Implementation Of Rismentioning

confidence: 99%

Reconfigurable intelligent surfaces for smart wireless environments: channel estimation, system design and applications in 6G networks

Liang

Chen

Long

et al. 2021

Sci. China Inf. Sci.

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“…Making use of their adjustable dielectric characteristics, LCs can be utilized to create active terahertz devices. [12][13][14] Recently researchers attracted with new approach of LC-based programmable metasurface and published related literatures. A Design Optimization of Reconfigurable Liquid Crystal Patch Antenna is reported in.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal-based programmable metasurface for terahertz beam manipulation

Dhote,

Singh,

Sharma

2024

Emerging Liquid Crystal Technologies XIX

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This manuscript presented the programmable metasurface based on LC (liquid crystal) material to manipulate the THz (terahertz) wave. To manipulate the EM (electromagnetic wave), the programmable and digital coding metasurfaces have been widely used in the microwave range using the semiconductor controlling elements (PIN diode and varactor diode). However, in the THz range, these semiconductor components have limited applications. Herein, a 1-bit digital programmable metasurface based on LC is proposed to achieve the THz wave manipulation with electrical control. The 1bit digital coding metasurface is composed of two kinds of meta-atoms including "0" and "1" digital codes corresponding to the opposite reflection phase response "0" and "" respectively. The reflection phase of the metasurface element is nearly 180 0 manipulating between biased (1) and unbiased (0) states of the coding sequence. When the different coding sequence is applied to the metasurface array, the phase profile between metasurface elements is changed dynamically and manipulate the incident THz beam. The proposed LC-based THz metasurface unit cell is applied with the different biasing voltages and in result the relative permittivity of the LC material is changed from 2.63 to 3.67 based on the orientation of the LC molecules. However, the resonant frequency is switching from 0.121 THz to 0.108 THz and achieved the 180 degree phase differences. Furthermore, 36x36 metasurface array is enabled to perform multi-functionalities including dual beam and multi-beam steering, beam splitting that could be implemented in the application of sensing, imaging, defence RCS (radar cross section) reduction and wireless communication such as RIS (Reconfigurable Intelligent Surfaces).

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