Development of Beam Steerable Reflectarray With Liquid Crystal for Both E-Plane and H-Plane

Li, Xiaotong; Sato, Hiroyasu; Shibata, Yosei; Ishinabe, Takahiro; Fujikake, Hideo; Chen, Qiang

doi:10.1109/access.2022.3155544

Cited by 18 publications

(12 citation statements)

References 36 publications

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“…Characterization becomes more challenging for 4D printing, as it involves applying stimuli to control material properties over time. For instance, the molecular arrangement of LC structures can be reoriented with an electric field using transparent electrodes, resulting in changes in the permittivity of the LC structure [58], as illustrated in Fig. 3.…”

Section: A Materials Characterization and Antenna Parametersmentioning

confidence: 99%

“…Peak gain was approximately 5 dBi. In the work [58] a reconfigurable reflectarray (RA) based on a LC was built for the Ka-band. The RA element consists of a multilayer structure composed of a top layer of quartz glass, followed by a two-finger patch, a polyamide layer, a LC layer, another polyamide layer, a ground plane sheet, then a FR-4 board with vias and a slot (Fig.…”

Section: B Liquid Crystal Polymers (Lcp)mentioning

confidence: 99%

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A State-of-the-Art Review on 4D Printed Antennas and Other Adaptable Designs

Carvalho,

Reis,

Caldeirinha

2024

IEEE Access

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This article offers a thorough review of the current state-of-the-art in four-dimensional (4D) printed antennas and possible adaptable designs. It provides a succinct examination of various categories of materials used in three-dimensional (3D) and 4D printing, including the utilization of smart materials available in both printable and synthesized forms. The review encompasses a concise analysis of fabrication techniques, stimuli, and response behaviors applied in various types of smart materials. These materials have the potential to fabricate antennas with tunable and reconfigurable properties, including frequency of operation, bandwidth, gain, and radiation pattern. Given the novelty of applying 4D printing in antenna technologies, the review also considers additional reconfigurable antennas with mechanically tunable properties, as well as those in non-printed formats. This exploration hints at potential adaptations to the latter for the development of 4D printed antennas. The utilization of 4D printing presents a complex yet intriguing approach to antenna fabrication, offering the possibility of creating dynamic antennas with sophisticated characteristics.

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Section: A Materials Characterization and Antenna Parametersmentioning

confidence: 99%

Section: B Liquid Crystal Polymers (Lcp)mentioning

confidence: 99%

A State-of-the-Art Review on 4D Printed Antennas and Other Adaptable Designs

Carvalho,

Reis,

Caldeirinha

2024

IEEE Access

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show abstract

“…Researchers are actively involved in discussions about the sixth generation and beyond the fifth generation (B5G) of mobile communications in several countries [3][4][5][6]. To meet this advancement, the community faces a series of challenges, encompassing algorithmic and mathematical complexities, as well as issues related to hardware and materials [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Secrecy Analysis of a Mu-MIMO LIS-Aided Communication Systems under Nakagami-m Fading Channels

Ferreira,

Fraidenraich,

de Figueiredo

et al. 2024

Sensors

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This study evaluates the performance of large intelligent surface (LIS) technology in the context of a multi-user MIMO mobile communication system (Mu-MIMO) proposed for the sixth generation (6G). LIS employs digitally controlled reflectors to enhance Signal-to-Interference plus Noise Ratio (SINR) and establish line of sight (LoS) connectivity in non-LoS environments, improving transmission security. Analytical expressions are derived to assess LIS performance metrics, including distribution parameters, bit error probability, and secrecy outage probability, considering the presence of eavesdroppers and environmental fading. The study highlights the potential of LIS technology to enhance the confidentiality and reliability of digital communication systems in next-generation networks.

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“…The alignment and birefringence of the LC molecules were electrically switched on the millisecond time scale, resulting in fast phase modulation. Therefore, LCs are applied in displays, − spatial light modulators (SLM), − and beam steering reflectors. − …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, LCs are applied in displays, 28 − 31 spatial light modulators (SLM), 32 − 34 and beam steering reflectors. 35 − 37 …”

Section: Introductionmentioning

confidence: 99%

Plasmonic Color Switching by a Combination Device with Nematic Liquid Crystals and a Silver Nanocube Monolayer

Mizuno,

Shibata,

Fujikake

et al. 2023

ACS Omega

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We experimentally demonstrated electrical plasmonic color modulation by combining a nematic-phase liquid crystal (LC) layer and a silver nanocube (AgNC) monolayer. The color modulation LC/AgNC device was fabricated by filling LCs with negative dielectric anisotropy onto a densely assembled AgNC monolayer. The transmitted light color through the LC/AgNC device was modulated between green and magenta by applying voltages of 0−15 V. The peaks and dips in the transmission spectrum of the LC/AgNC device at wavelengths of 500−600 nm were switched with voltage. The switching effect of light transmission in the green region was achieved by overlapping the plasmon resonance of the AgNC monolayer and multiple transmittance peaks caused by the birefringence of the LC layer. In addition, the color inversion appeared at cross-Nicole and parallel-Nicole because the LC layer functioned like a halfwave plate due to birefringence. The electrical modulation of the plasmonic color with LCs has a high implementation capability in microdevices and is anticipated to be applied in display devices or color filters.

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Development of Beam Steerable Reflectarray With Liquid Crystal for Both E-Plane and H-Plane

Abstract: Date of publication xxxx 00, 0000, date of current version xxxx 00, 0000.

Cited by 18 publications

References 36 publications

A State-of-the-Art Review on 4D Printed Antennas and Other Adaptable Designs

A State-of-the-Art Review on 4D Printed Antennas and Other Adaptable Designs

Secrecy Analysis of a Mu-MIMO LIS-Aided Communication Systems under Nakagami-m Fading Channels

Plasmonic Color Switching by a Combination Device with Nematic Liquid Crystals and a Silver Nanocube Monolayer

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