Frequency tunable and high selective frequency selective surfaces for Ku-band

Jiang, Di; Chen, Xiaoyu; Zhuang, Jie; Ran, Puhang; Li, Xiaoyü

doi:10.1109/apmc47863.2020.9331621

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Liquid Crystal (LC)-based mm-wave devices, such as Reconfigurable Intelligent Surfaces (RIS), metasurfaces, reflectarray antennas and other tunable microwave components, rely on the ability to tune the electromagnetic properties of LC materials. Although originally used in optical devices, to date, LCs have been used in RF to manufacture tunable antennas [1]- [4], filters [5], [6], delay lines [7]- [10] and frequency selective surfaces [11]- [13], among other reconfigurable devices [14]. These devices usually contain a cavity filled with a LC material whose dielectric permittivity can be tuned by means of varying an applied electric field.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Application of Dual-Frequency Liquid-Crystal Mixtures in mm-Wave Reflectarray Cells to Improve Their Temporal Response

Guirado¹,

Rosa

Pérez-Palomino³

et al. 2023

IEEE Trans. Antennas Propagat.

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Liquid Crystal-based mm-wave spatially fed antennas with electronic reconfiguration are a promising solution at the higher frequencies required in next generation networks. However, one of the main drawbacks of the technology in these bands stems from the high reconfigurability times they present. Through this work, a relevant step towards overcoming the temporal problem by using Dual Frequency Liquid Crystals (DFLC) is presented. This paper details, for the first time, both the electromagnetic and temporal characterization of four commercially available DFLC mixtures in W-band, enabling their use in designing faster devices. To evaluate the experimental characterization, a reflectarray surface (made of 50x50 cells) specifically designed to achieve fast switching times with a sufficient phase range has been manufactured and measured. For this cell, a preliminary addressing technique based on overdriving has been used, exhibiting reconfigurability (rise and decay) times of 20 ms, one order of magnitude faster than the current state of the art of LC-based mm-wave planar devices. The measured results match the simulations, and reveal that a precisely designed biasing technique using overdrive must be used for DFLCcells to achieve time reduction. Additionally, the benefits of this technology compared with other LC acceleration strategies in mm-wave are discussed.

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Section: Introductionmentioning

confidence: 99%

Characterization and Application of Dual-Frequency Liquid-Crystal Mixtures in mm-Wave Reflectarray Cells to Improve Their Temporal Response

Guirado¹,

Rosa

Pérez-Palomino³

et al. 2023

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

show abstract

“…INTRODUCTION Liquid Crystal (LC)-based mm-wave devices, such as Reconfigurable Intelligent Surfaces (RIS), metasurfaces, reflectarray antennas and other tunable microwave components, rely on the ability to tune the electromagnetic properties of LC materials. Although originally used in optical devices, to date, LCs have been used in RF to manufacture tunable antennas [1]- [4], filters [5], [6], delay lines [7]- [10] and frequency selective surfaces [11]- [13], among other reconfigurable devices [14]. These devices usually contain a cavity filled with a LC material whose dielectric permittivity can be tuned by means of varying an applied electric field.…”

mentioning

confidence: 99%

Characterization and Application of Dual Frequency Liquid Crystal mixtures in mm-Wave Reflectarray Cells to improve their Temporal Response

Guirado¹,

Rosa²,

Pérez-Palomino³

et al. 2023

Preprint

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<p>Liquid Crystal-based mm-wave spatially fed antennas with electronic reconfiguration are a promising solution at the higher frequencies required in next generation networks. However, one of the main drawbacks of the technology in these bands stems from the high reconfigurability times they present. Through this work, a relevant step towards overcoming the temporal problem by using Dual Frequency Liquid Crystals (DFLC) is presented. This paper details, for the first time, both the electromagnetic and temporal characterization of four commercially available DFLC mixtures in W-band, enabling their use in designing faster devices. To evaluate the experimental characterization, a reflectarray surface (made of 50x50 cells) specifically designed to achieve fast switching times with a sufficient phase range has been manufactured and measured. For this cell, a preliminary addressing technique based on overdriving has been used, exhibiting reconfigurability (rise and decay) times of 20 ms, one order of magnitude faster than the current state of the art of LC-based mm-wave planar devices. The measured results match the simulations, and reveal that a precisely designed biasing technique using overdrive must be used for DFLC-cells to achieve time reduction. Additionally, the benefits of this technology compared with other LC acceleration strategies in mm-wave are discussed.</p>

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Frequency tunable and high selective frequency selective surfaces for Ku-band

Cited by 2 publications

References 9 publications

Characterization and Application of Dual-Frequency Liquid-Crystal Mixtures in mm-Wave Reflectarray Cells to Improve Their Temporal Response

Characterization and Application of Dual-Frequency Liquid-Crystal Mixtures in mm-Wave Reflectarray Cells to Improve Their Temporal Response

Characterization and Application of Dual Frequency Liquid Crystal mixtures in mm-Wave Reflectarray Cells to improve their Temporal Response

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