About Experimental Measurements of Dielectric Anisotropy of Liquid Crystals for a Wide Frequency Range.

1978 ◽  
Author(s):  
J.P. Parneix ◽  
C. Vruon ◽  
A. Chapoton
Keyword(s):  
Liquid Crystals ◽  
Wide Frequency Range ◽  
Dielectric Anisotropy ◽  
Experimental Measurements ◽  
Frequency Range

scholarly journals Dielectric Spectroscopy Analysis of Liquid Crystals Recovered from End-of-Life Liquid Crystal Displays

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2873
Author(s):  
Ana Barrera ◽  
Corinne Binet ◽  
Frédéric Dubois ◽  
Pierre-Alexandre Hébert ◽  
Philippe Supiot ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
End Of Life ◽  
Room Temperature ◽  
Liquid Crystal Displays ◽  
Dielectric Anisotropy ◽  
Frequency Range ◽  
Spectroscopy Analysis ◽  
Diamond Nanoparticles ◽  
Nematic Phases ◽  
Universal Law

In the present work, the dielectric properties of recycled liquid crystals (LCs) (non-purified, purified, and doped with diamond nanoparticles at 0.05, 0.1, and 0.2 wt%) were investigated. The studied LC mixtures were obtained from industrial recycling of end-of-life LC displays presenting mainly nematic phases. Dielectric measurements were carried out at room temperature on a frequency range from 0.1 to 106 Hz using an impedance analyzer. The amplitude of the oscillating voltage was fixed at 1 V using cells with homogeneous and homeotropic alignments. Results show that the dielectric anisotropy of all purified samples presents positive values and decreases after the addition of diamond nanoparticles to the LC mixtures. DC conductivity values were obtained by applying the universal law of dielectric response proposed by Jonscher. In addition, conductivity of the doped LC mixtures is lower than that of the undoped and non-purified LC.

scholarly journals Tunable microstrip liquid crystals patch antennas

2021 ◽  
Vol 1198 (1) ◽  
pp. 012010
Author(s):  
N A Romanov ◽  
T A Chimytov ◽  
A V Nomoev ◽  
E Ch Khartaeva ◽  
E A Gurvitz
Keyword(s):  
Dielectric Constant ◽  
Liquid Crystals ◽  
Magnetic Nanoparticles ◽  
Phase Shift ◽  
Patch Antenna ◽  
High Frequency ◽  
Dielectric Anisotropy ◽  
Slight Variation ◽  
Patch Antennas ◽  
Frequency Range

Abstract A patch antenna based on liquid crystals for the5G GHz range was simulated. The variation of the antenna frequency range after doping magnetic nanoparticles was verified. The high-frequency patch antenna parameters are calculated considering the dependence of the reflectivity of the antenna 11 on the dielectric anisotropy, gain, directivity and phase shift. The ability to control the frequency range of the patch antenna is shown. The phase distributions were demonstrated for 5CB crystals with a slight variation in the dielectric constant tensor and crystals with magnetic permeability.

Installation for testing electronic voltmeters over a wide frequency range

1976 ◽  
Vol 19 (10) ◽  
pp. 1525-1526
Author(s):  
A. M. Fedorov ◽  
V. V. Krestovskii ◽  
V. S. Kiselev ◽  
S. A. Razumovskii ◽  
V. A. Shcheglov
Keyword(s):  
Wide Frequency Range ◽  
Frequency Range

Analysis of Dielectric Spectra of Water with Conductive Impurities in a Wide Frequency Range

2018 ◽  
Vol 60 (11) ◽  
pp. 1893-1900 ◽  
Author(s):  
V. A. Zhuravlev ◽  
V. I. Suslyaev ◽  
A. V. Zhuravlev ◽  
E. Yu. Korovin
Keyword(s):  
Wide Frequency Range ◽  
Frequency Range ◽  
Dielectric Spectra
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