Dielectric Properties of Liquid Crystal Polymer Substrates in the Region from 90 to 140 GHz
In this article, we present a study of the equivalent dielectric constant of two nematic liquid crystals (LCs) with different thicknesses, in the region from 90 to 140 GHz. The equivalent dielectric constant of the LCs was measured using a frequency selective surface (FSS). The LC-based tunable FSS...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-01-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/2/170 |
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| author | Rongxin Mao Guozhen Zhang Lu Xu Haoyu Gao Jun Yang Zhiping Yin Guangsheng Deng Hongbo Lu |
| author_facet | Rongxin Mao Guozhen Zhang Lu Xu Haoyu Gao Jun Yang Zhiping Yin Guangsheng Deng Hongbo Lu |
| author_sort | Rongxin Mao |
| collection | DOAJ |
| description | In this article, we present a study of the equivalent dielectric constant of two nematic liquid crystals (LCs) with different thicknesses, in the region from 90 to 140 GHz. The equivalent dielectric constant of the LCs was measured using a frequency selective surface (FSS). The LC-based tunable FSS with 22 × 25 unit cells was printed on a quartz substrate with an area of 4 × 4 cm<sup>2</sup> and a thickness of 480 µm; the LC layer with thicknesses ranging from 30 to 100 µm acted as a substrate. The FSS featured a maximum frequency-shifting range of 8.15 GHz and 30 µm-thick LC layers with mutually orthogonal rubbing directions were deposited on it. The results show that the initial equivalent dielectric constant of the LC layer increased with the LC layer thickness, while the saturation-equivalent dielectric constant remained almost constant. This work provides LC parameters that can be useful for the design of LC-based devices in the millimeter and terahertz ranges. |
| first_indexed | 2024-03-09T22:15:44Z |
| format | Article |
| id | doaj.art-db084f73d5304951949d3d8fbfe42836 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-09T22:15:44Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-db084f73d5304951949d3d8fbfe428362023-11-23T19:24:02ZengMDPI AGCrystals2073-43522022-01-0112217010.3390/cryst12020170Dielectric Properties of Liquid Crystal Polymer Substrates in the Region from 90 to 140 GHzRongxin Mao0Guozhen Zhang1Lu Xu2Haoyu Gao3Jun Yang4Zhiping Yin5Guangsheng Deng6Hongbo Lu7Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, Hefei University of Technology, Hefei 230009, ChinaSpecial Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, Hefei University of Technology, Hefei 230009, ChinaSpecial Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, Hefei University of Technology, Hefei 230009, ChinaSpecial Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, Hefei University of Technology, Hefei 230009, ChinaSpecial Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, Hefei University of Technology, Hefei 230009, ChinaSpecial Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, Hefei University of Technology, Hefei 230009, ChinaAnhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, ChinaSpecial Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, Hefei University of Technology, Hefei 230009, ChinaIn this article, we present a study of the equivalent dielectric constant of two nematic liquid crystals (LCs) with different thicknesses, in the region from 90 to 140 GHz. The equivalent dielectric constant of the LCs was measured using a frequency selective surface (FSS). The LC-based tunable FSS with 22 × 25 unit cells was printed on a quartz substrate with an area of 4 × 4 cm<sup>2</sup> and a thickness of 480 µm; the LC layer with thicknesses ranging from 30 to 100 µm acted as a substrate. The FSS featured a maximum frequency-shifting range of 8.15 GHz and 30 µm-thick LC layers with mutually orthogonal rubbing directions were deposited on it. The results show that the initial equivalent dielectric constant of the LC layer increased with the LC layer thickness, while the saturation-equivalent dielectric constant remained almost constant. This work provides LC parameters that can be useful for the design of LC-based devices in the millimeter and terahertz ranges.https://www.mdpi.com/2073-4352/12/2/170nematic liquid crystalfrequency selective surfaceelectrical controldielectric constant |
| spellingShingle | Rongxin Mao Guozhen Zhang Lu Xu Haoyu Gao Jun Yang Zhiping Yin Guangsheng Deng Hongbo Lu Dielectric Properties of Liquid Crystal Polymer Substrates in the Region from 90 to 140 GHz Crystals nematic liquid crystal frequency selective surface electrical control dielectric constant |
| title | Dielectric Properties of Liquid Crystal Polymer Substrates in the Region from 90 to 140 GHz |
| title_full | Dielectric Properties of Liquid Crystal Polymer Substrates in the Region from 90 to 140 GHz |
| title_fullStr | Dielectric Properties of Liquid Crystal Polymer Substrates in the Region from 90 to 140 GHz |
| title_full_unstemmed | Dielectric Properties of Liquid Crystal Polymer Substrates in the Region from 90 to 140 GHz |
| title_short | Dielectric Properties of Liquid Crystal Polymer Substrates in the Region from 90 to 140 GHz |
| title_sort | dielectric properties of liquid crystal polymer substrates in the region from 90 to 140 ghz |
| topic | nematic liquid crystal frequency selective surface electrical control dielectric constant |
| url | https://www.mdpi.com/2073-4352/12/2/170 |
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