Measurement of Dielectric Anisotropy of Some Liquid Crystals for Microwave Applications

Xu, Huan; Trushkevych, Oksana; Collings, N.; Crossland, W. A.

doi:10.1080/15421400902817346

Cited by 13 publications

(9 citation statements)

References 16 publications

(22 reference statements)

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“…[3] An LC sample was sandwiched between a pair of parallel metal electrodes with polyimide coating to achieve planar alignment and 20µm spacers outside the electrode area (ε ⊥ measurement). An electric field up to 40V AC (1 kHz) is applied to the sample to switch it into homeotropic geometry (ε || measurement).…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…In comparison with the existing candidate materials such as ferroelectric ceramics, liquid crystals (LC) have drawn attention in recent years because of lower losses at microwave frequencies and comparatively high anisotropy. [1][2][3] LCs can be loaded with various types of nanoparticles for enhanced performance. Anisotropic particles make particularly interesting additives because they may align with the anisotropic host and further enhance its anisotropy.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric anisotropy of nematic liquid crystals loaded with carbon nanotubes in microwave range

et al. 2010

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Section: Experimental Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dielectric anisotropy of nematic liquid crystals loaded with carbon nanotubes in microwave range

et al. 2010

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“…Due to the display mass market LC materials are accessible, and fabrication methods can be derived from display technology that can make LC based microwave devices highly cost effective [15]. Some LC compounds have been shown to possess a large anisotropy at microwave frequencies [8,16]. The dielectric anisotropy in the microwave region correlates with the material's birefringence in the visible range [8].…”

Section: Introductionmentioning

confidence: 99%

“…Some LC compounds have been shown to possess a large anisotropy at microwave frequencies [8,16]. The dielectric anisotropy in the microwave region correlates with the material's birefringence in the visible range [8]. One class of materials with particularly high optical birefringence is isothiocyanates [17].…”

Section: Introductionmentioning

confidence: 99%

“…Their anisotropy and sensitivity to external fields have led to numerous display and nondisplay applications. Moreover, LCs are very promising materials at microwave [1][2][3][4][5][6][7][8] and terahertz (THz) frequencies [9][10][11][12][13] due to low losses and comparatively high anisotropy. LCs are particularly suitable for operation at frequencies beyond 10 GHz as the dielectric loss decreases with increasing frequency [14], making them attractive for phase modulating devices.…”

Section: Introductionmentioning

confidence: 99%

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Broad spectrum measurement of the birefringence of an isothiocyanate based liquid crystal

Trushkevych

et al. 2010

Appl. Opt.

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(2010) Broad spectrum measurement of the birefringence of an isothiocyanate based liquid crystal. Applied Optics, 49 (28). pp. 5212-5216. Permanent WRAP URL:http://wrap.warwick.ac.uk/92169 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher's statement:© 2010 Optical Society of America]. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription.

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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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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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Measurement of Dielectric Anisotropy of Some Liquid Crystals for Microwave Applications

Cited by 13 publications

References 16 publications

Dielectric anisotropy of nematic liquid crystals loaded with carbon nanotubes in microwave range

Dielectric anisotropy of nematic liquid crystals loaded with carbon nanotubes in microwave range

Broad spectrum measurement of the birefringence of an isothiocyanate based liquid crystal

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

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