Nematic liquid crystals in inverted microstrip structures

Jerzy Piotrowski , Janusz Parka , Edward Nowinowski-Kruszelnicki

Abstract

Nematic liquid crystals are promising dielectrics for tunable microwave devices due to their significant birefringence and moderately low loss. Dielectric anisotropy or refractive index anisotropy of liquid crystal is one of the important parameter for the design of variety of reconfigurable devices. In this work, transmission line method is used for the broadband investigation of nematic liquid crystals in the frequency range of 1-10 GHz. For this purpose, a measurement device is proposed with a tunable liquid crystal transduces based on an inverted microstrip structure section placed between two segments of layered microstrip lines terminated by microstrip-coaxial line transitions. Measurements of the scattering parameters of the device with standard liquid crystal 6CHBT as well as with a novel highly anisotropic mixture W1825 have been conducted. Based on these measurements, a high effective refractive index anisotropy of 0.31 for the W1825 mixture compared to 0.12 for 6CHBT have been determined. These values are lower of 26% and 18% than anisotropy of the refractive indices appointed by a resonator method for W1825 and 6CHBT, respectively. Progress in highly anisotropic mixtures opens new low-cost liquid crystal applications in microwave devices.
Author Jerzy Piotrowski (FEIT / MO)
Jerzy Piotrowski,,
- The Institute of Microelectronics and Optoelectronics
, Janusz Parka (FEIT / MO)
Janusz Parka,,
- The Institute of Microelectronics and Optoelectronics
, Edward Nowinowski-Kruszelnicki
Edward Nowinowski-Kruszelnicki,,
-
Pages1-7
Book Szczepański Paweł, Kisiel Ryszard, Romaniuk Ryszard (eds.): Proceedings of SPIE Electron Technology Conference 2013, vol. 1, no. 8902, 2013, P.O.Box 10, Bellingham, Washington 98227-0010 USA, SPIE, ISBN 9780819495211, 752 p., DOI:10.1117/12.2033297
Keywords in Englishnematic liquid crystals, inverted microstrip line, tunable liquid crystal transducer, microwave phase shifters, passive circuits,
DOIDOI:10.1117/12.2030851
URL http://spie.org/x648.xml?product_id=2030851
Languageen angielski
Score (nominal)15
Score sourceconferenceIndex
ScoreMinisterial score = 10.0, 24-01-2020, BookChapterMatConfByIndicator
Ministerial score (2013-2016) = 15.0, 24-01-2020, BookChapterMatConfByIndicator
Publication indicators Scopus Citations = 3; WoS Citations = 1
Citation count*7 (2020-09-14)
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