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Phase range analysis of patch antenna reflectarry based on nematic liquid crystal substrate with dynamic rcs variation

Ismail, Muhammad Yusof and Cahill , Robert and Amin , Muhammad and Ahmad Faizal , Mohd Zain and Khalid Amin, Mirza (2007) Phase range analysis of patch antenna reflectarry based on nematic liquid crystal substrate with dynamic rcs variation. In: 2007 Asia Pacific Microwave Conference.

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Abstract

In this paper, the phase agility of the patch antenna periodic array using K15 nematic liquid crystal as the dielectric medium is presented. Numerical and experimental results at X-hand are used to compare the plane wave scattering parameter from a two patch antenna reflectarmy cell of 500pm. The dependence of reflection phase versus frequency and gradient on loss tangent is characterized. A tunable dynamic phase range of 221° is achieved over a bandwidth of 170MHz with dielectric anisotropy of 0.17. The simulated results are validated by experimental measurements Furthermore the measured results demonstrate that within a certain frequency band, at any frequency, the RCS of the retlectarray can be dynamically controlled using DC bias voltage and hence its RCS signature can he reduced electmnicnlly.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: dielectric anisotropy, liquid crystal, lc re-flectarray, dynamic phase range
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Electrical and Electronic Engineering > Department of Electrical Technology
Depositing User: Normajihan Abd. Rahman
Date Deposited: 28 Oct 2010 01:08
Last Modified: 29 Apr 2011 06:40
URI: http://eprints.uthm.edu.my/id/eprint/347
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