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Tunability performance of reflectarray elements based on anisotropic substrates

Dahri, Muhammad Hashim and Ismail, Muhammad Yusof (2011) Tunability performance of reflectarray elements based on anisotropic substrates. In: International Seminar on the Application of Science and Mathematics 2011, 1 - 3 November 2011, Putra World Trade Centre, Kuala Lumpur.


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Reflectarray antennas combine some of the best features between parabolic reflector and phased array antennas, but their application in satellite and terrestrial systems is limited due to high reflection loss performance and limited phase ranges. In this paper an X-band reflectarray patch element constructed on 1mm thick anisotropic liquid crystal substrate is proposed to be employed as a dynamic phase control strategy for terrestrial systems. Reflection loss and tunability characteristics of dipole and rectangular patch elements, printed on different anisotropic liquid crystal substrates have been investigated by using CST computer model. A detailed analysis of static and dynamic phase ranges with respect to dielectric anisotropy is presented for different anisotropic liquid crystal substrate materials. The preliminary simu lated results demonstrate that dipole patch element contributes highest reflection loss performance of 33.51d B compared to rectangular patch element which offers maximu m reflection loss of 10.74dB, by using K-15 nematic liquid crystal as dielectric substrate. The numerical Finite Integral Method analysis shows that dipo le patch element printed above novel LC mixture offers maximu m static and dynamic phase ranges of 210° and 290° respectively, co mpared to rectangular patch element which o ffers maximu m static and dynamic phase ranges of 182° and 230° respectively. The dielectric an isotropic properties of liquid crystal materials presented in this work are shown to significantly affect the reflection loss and phase range performance of reflectarray antennas for rapid dynamic phase change which was required particularly for s atellite and terrestrial systems.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Reflectarray; terrestrial systems; patch element; dielectric anisotropy; liquid crystal; tunability; dynamic phase range; Finite Integral Method
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics
Divisions: Faculty of Electrical and Electronic Engineering > Department of Communication Engineering
Depositing User: M.Iqbal Zainal A
Date Deposited: 05 Mar 2012 02:16
Last Modified: 05 Mar 2012 02:16
URI: http://eprints.uthm.edu.my/id/eprint/2373
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