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Effective dielectric constant of top grounded coplanar waveguide on liquid crystal superstrate

Bulja, Senad and Mirshekar‐Syahkal, Dariush and James, Richard and Day, Sally E and Fernández, F Aníbal (2013) 'Effective dielectric constant of top grounded coplanar waveguide on liquid crystal superstrate.' Microwave and Optical Technology Letters, 55 (6). pp. 1416-1418. ISSN 0895-2477

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Abstract

The effective dielectric constant of the top grounded coplanar waveguide with a liquid crystal (LC) superstrate for phase shifting applications is investigated in the frequency range of 30-60 GHz. Two nematic LC mixtures, namely E7 and MDA-00-3506, are used as the superstrate. The measurements show that MDA-00-3506 offers higher values of phase shift per millimeter than its E7 counterpart. In particular, the MDA-00-3506 provides 3.14°/mm, whereas E7 gives 2.79°/mm at 60 GHz. The results of the dielectric constants from measurement and computer modeling are found to agree to within 5%. For the modeling, a comprehensive finite element package predicting the local alignment of LC molecules and effective dielectric constant at different bias voltages and frequencies are used. Copyright © 2013 Wiley Periodicals, Inc.

Item Type: Article
Uncontrolled Keywords: CPW; liquid crystal; finite element method; mm-wave devices
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Faculty of Science and Health
Faculty of Science and Health > Computer Science and Electronic Engineering, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 12 Aug 2014 15:03
Last Modified: 15 Jan 2022 00:33
URI: http://repository.essex.ac.uk/id/eprint/9916

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