Measurements of anisotropic complex permittivity of liquid crystals at microwave frequencies

被引：13

作者：

Parka, Janusz

Krupka, Jerzy

Dabrowski, Roman

Wosik, Jarek

机构：

[1] Inst Mikroelektron & Optoelektron Politechniki Wa, PL-00662 Warsaw, Poland

[2] Mil Univ Technol, Inst Phys Appl, PL-00908 Warsaw, Poland

[3] Mil Univ Technol, Inst Phys Chem, PL-00908 Warsaw, Poland

[4] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77204 USA

[5] Univ Houston, Texas Ctr Supercond, Houston, TX 77204 USA

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2007年 / 27卷 / 8-9期

关键词：

liquid crystals; electrical properties; functional applications;

D O I：

10.1016/j.jeurceramsoc.2006.11.015

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Recent interest in application of liquid crystals for tuning of microwave frequency range devices generated a need for better microwave characterization of these anisotropic and DC electric and magnetic fields sensitive materials. We report on measurements of the complex permittivity tensor of two liquid crystals and on determination of their DC electric field bias dependence. Measurements were carried out using a novel microwave cylindrical dielectric resonator technique which utilizes TE011 and TM011 modes. Liquid crystals are inserted into the inner hole in the dielectric resonator. Results of measurements have shown significant anisotropy in crystals dielectric properties and also allow estimates of tunability and tuning speed. The measurements showed some promises for liquid crystals to be used for tuning, but more characterization and technological work is needed. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：2903 / 2905

页数：3

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