Peng, Haofeng;
Zhang, Yongwei;
Zhu, Senlai;
Temiz, Murat;
El-Makadema, Ahmed;
(2022)
Determining dielectric properties of nematic liquid crystals at microwave frequencies using inverted microstrip lines.
Liquid Crystals
, 49
(15)
pp. 2069-2081.
10.1080/02678292.2022.2102685.
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Abstract
In this paper, we have investigated the dielectric properties of nematic liquid crystals (NLCs) by measuring the resonant frequencies of inverted microstrip lines (IMSLs) of NLC being the substrate material at the microwave frequency band. The designed IMSL devices consist of a cavity for NLC mixture between the inverted microstrip line and the ground plane. The anisotropy values of the NLCs were determined by observing the change of the resonant frequency when the strength of external electric fields applied on the NLCs varied. The experiments demonstrated that the effective dielectric constant of the NLC can be manipulated by the proposed devices via external bias voltage for tuning. The accuracy of the method for determining the dielectric constants of JC-M-LC-E7 (JC-E7) and QYPD-036 LCs was analysed with several prototypes based on two separate designs. The high accuracy of 91% in permittivity determination was demonstrated, and the design and fabrication techniques are beneficial for making microwave components of high tunability.
| Type: | Article |
|---|---|
| Title: | Determining dielectric properties of nematic liquid crystals at microwave frequencies using inverted microstrip lines |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1080/02678292.2022.2102685 |
| Publisher version: | https://doi.org/10.1080/02678292.2022.2102685 |
| Language: | English |
| Additional information: | © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way. |
| Keywords: | Science & Technology, Physical Sciences, Technology, Chemistry, Multidisciplinary, Crystallography, Materials Science, Multidisciplinary, Chemistry, Materials Science, Nematic liquid crystal, inverted microstrip line, effective relative permittivity, microwave tunable device, PHASE-SHIFTER, FILTER, METAMATERIAL, TECHNOLOGY |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10166162 |
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