Full Duplex SATCOM ESA With Switchable Polarization and Wide Tunable Bandwidth Using a Tripleband Metasurface Aperture

Liquid crystals (LCs) technology have a well‐established history of applications in visible light, particularly in the display industry. However, with the rapid growth in communication technology, LCs have become a topic of current interest for high‐frequency microwave (MW) and millimeter‐wave (mmWave) applications due to promising characteristics such as tunability, continuous tuning, low losses, and price compatibility. To improve the performance of future communication technology using LCs, it is not sufficient only with the perspective of radio‐frequency (RF) technology. Therefore, it is imperative to understand not only the novel structural designs and optimization of MW engineering but also the perspective of materials engineering when implementing advanced RF devices with maximum performance for next‐generation satellite and terrestrial communication. Herein, based on advanced nematic LCs, polymer‐modified LCs, dual‐frequency LCs, and photo‐reactive LCs, this article summarizes and examines the modulation principles and key research directions for the design strategies of LCs for advanced smart RF devices with improved driving performance and novel functionality. Furthermore, the challenges in development of state‐of‐the‐art smart RF devices that use LCs are discussed.

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Section: Performance Improvement Via Lc Technologymentioning

confidence: 99%

Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

Choi

Park

et al. 2023

Advanced Materials

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“…With the already existing expertise in large-panel mass production from display technology, its continuous tunability, and the low power consumption, LC presents a promising approach for the realization of cost and powereffective large-scale RISs. Recent publications 14,15 demonstrate a flatpanel phased array with 70000 independently tunable radiating elements and an aperture of 82 cm. LC-RIS shows potential for diverse applications, being considered not only for mm-Wave and THz communication but also for visible light communication [16][17][18] , where extensive knowledge in LC mixtures and devices already exists.…”

Section: Delay Line Architecturementioning

confidence: 99%

Architecture for sub-100 ms liquid crystal reconfigurable intelligent surface based on defected delay lines

Neuder,

Späth,

Schüßler

et al. 2024

Commun Eng

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Reconfigurable intelligent surfaces, comprised of passive tunable elements, are emerging as an essential device for upcoming millimeter wave and terahertz wireless systems. A fundamental aspect of the device involves the tuning technology used to achieve reconfigurability. Among alternatives such as semiconductors and micro-electromechanical systems, liquid crystal offers advantages including cost- and power-effective large-panel scalability. In this context, conventional liquid crystal-based reconfigurable intelligent surface approaches face limitations in optimizing for bandwidth, response time and loss simultaneously, requiring trade-offs between them. Here we detail an architecture for a liquid crystal-based reconfigurable intelligent surface with compact defected delay lines that provide continuous, 360-degree tunability, enabling fast response time, wide bandwidth and low loss. A reconfigurable intelligent surface with a thin 4.6 μm liquid crystal layer is designed, fabricated, and characterized, exhibiting response times of 72 milliseconds, insertion losses below 7 dB, and a 6.8 GHz (10.9%) bandwidth at 62 GHz, all while utilizing a lossy glass substrate and gold as a conductor.

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“…With the already existing expertise in large panel mass production from display technology, its continuous tunability and the low power consumption, LC presents a promising approach for the realization of cost and power-effective large-scale RISs. Recent publications [14,15] demonstrate a flat-panel phased array with 70000 independently tunable radiating elements and an aperture of 82 cm. However, the implementation of LC in RISs also poses challenges, as it provides comparably slow response times in the range of milliseconds to seconds, it is temperature sensitive and experiences moderate insertion loss.…”

Section: Introductionmentioning

confidence: 99%

Architecture for sub-100 ms Liquid Crystal Reconfigurable Intelligent Surface Based on Defected Delay Lines

Neuder,

Späth,

Schüßler

et al. 2023

Preprint

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Reconfigurable Intelligent Surfaces (RISs), comprised of passive tunable elements, are emerging as an essential device for upcoming Millimeter Wave and Terahertz wireless systems. A fundamental aspect of the device involves the tuning technology used to achieve reconfigurability. Among alternatives such as semiconductors and MEMS, Liquid Crystal (LC) offers advantages such as cost- and power-effective large-panel scalability. In this context, conventional LC-RIS approaches face limitations in optimizing for bandwidth, response time and loss simultaneously, requiring trade-offs between them. In this work, we detail a new architecture for LC-RIS with compact defected delay lines that provide continuous, 360-degree tunability, enabling RISs with fast response time, wide bandwidth and low loss. A RIS with a thin 4.6 μm LC layer is designed, fabricated, and characterized, exhibiting response times of 72 milliseconds, insertion losses below 7 dB, and a 6 GHz (10.9%) bandwidth at 62 GHz, all while utilizing a lossy glass substrate and gold as a conductor.

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Full Duplex SATCOM ESA With Switchable Polarization and Wide Tunable Bandwidth Using a Tripleband Metasurface Aperture

Cited by 5 publications

References 3 publications

Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

Architecture for sub-100 ms liquid crystal reconfigurable intelligent surface based on defected delay lines

Architecture for sub-100 ms Liquid Crystal Reconfigurable Intelligent Surface Based on Defected Delay Lines

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