Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials

The conventional antenna systems require the mechanical movement of beam scanning antenna to meet the demands of emerging field of communications. To overcome the flaw of the mechanical movement an electronically tunable reflectarray antenna based on non-homogeneous properties of substrate mat...

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Main Author:	Dahri, Muhammad Hashim
Format:	Thesis
Language:	English English English
Published:	2014
Subjects:	TK Electrical engineering Electronics Nuclear engineering TK7800-8360 Electronics
Online Access:	http://eprints.uthm.edu.my/1586/1/24p%20MUHAMMAD%20HASHIM%20DAHRI.pdf http://eprints.uthm.edu.my/1586/2/MUHAMMAD%20HASHIM%20DAHRI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1586/3/MUHAMMAD%20HASHIM%20DAHRI%20WATERMARK.pdf
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spelling	my-uthm-ep.15862021-10-03T08:05:43Z Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials 2014-08 Dahri, Muhammad Hashim TK Electrical engineering. Electronics Nuclear engineering TK7800-8360 Electronics The conventional antenna systems require the mechanical movement of beam scanning antenna to meet the demands of emerging field of communications. To overcome the flaw of the mechanical movement an electronically tunable reflectarray antenna based on non-homogeneous properties of substrate materials has been introduced. This research study provides a thorough investigation on the tunability performance of reflectarrays designed in X-band frequency range. The objective of this work is to demonstrate the functionality of an active reflectarray antenna with optimized loss performance and enhanced dynamic phase range. Different types of reflectarray resonant elements such as rectangular, dipole and ring are discussed here with different design configurations based on their ability of frequency tunability and dynamic phase range. Commercially available computer models of CST Microwave Studio and Ansoft HFSS have been used to investigate the phase agility characteristics of reflectarray resonant elements printed above various non�homogeneous materials (0.17≤ ∆ε ≤0.45). The analytical approach has been used to develop equations for progressive phase distribution and frequency tunability of individual reflectarray element which is validated by CST simulations. The results obtained from theoretical investigations have been further validated by experimental implementations. An optimized configuration of non-homogeneous Liquid Crystal (LC) material with 0.5 mm thickness below the resonant element has been designed and tested by waveguide scattering parameter measurements. An external bias voltage of 0V to 20V has been applied across the LC substrate of individual resonant elements in order to obtain the electronic tunability. The three resonant elements namely rectangular, dipole and ring offer a measured dynamic phase range of 95°, 153° and 197° respectively at 10 GHz using the proposed design configuration. Moreover, the ring element attains a 107% higher dynamic tunability with a 56% reduction in the reflective area as compared to rectangular element. 2014-08 Thesis http://eprints.uthm.edu.my/1586/ http://eprints.uthm.edu.my/1586/1/24p%20MUHAMMAD%20HASHIM%20DAHRI.pdf text en public http://eprints.uthm.edu.my/1586/2/MUHAMMAD%20HASHIM%20DAHRI%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/1586/3/MUHAMMAD%20HASHIM%20DAHRI%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Elektrik dan Elektronik
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TK Electrical engineering Electronics Nuclear engineering TK7800-8360 Electronics
spellingShingle	TK Electrical engineering Electronics Nuclear engineering TK7800-8360 Electronics Dahri, Muhammad Hashim Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials
description	The conventional antenna systems require the mechanical movement of beam scanning antenna to meet the demands of emerging field of communications. To overcome the flaw of the mechanical movement an electronically tunable reflectarray antenna based on non-homogeneous properties of substrate materials has been introduced. This research study provides a thorough investigation on the tunability performance of reflectarrays designed in X-band frequency range. The objective of this work is to demonstrate the functionality of an active reflectarray antenna with optimized loss performance and enhanced dynamic phase range. Different types of reflectarray resonant elements such as rectangular, dipole and ring are discussed here with different design configurations based on their ability of frequency tunability and dynamic phase range. Commercially available computer models of CST Microwave Studio and Ansoft HFSS have been used to investigate the phase agility characteristics of reflectarray resonant elements printed above various non�homogeneous materials (0.17≤ ∆ε ≤0.45). The analytical approach has been used to develop equations for progressive phase distribution and frequency tunability of individual reflectarray element which is validated by CST simulations. The results obtained from theoretical investigations have been further validated by experimental implementations. An optimized configuration of non-homogeneous Liquid Crystal (LC) material with 0.5 mm thickness below the resonant element has been designed and tested by waveguide scattering parameter measurements. An external bias voltage of 0V to 20V has been applied across the LC substrate of individual resonant elements in order to obtain the electronic tunability. The three resonant elements namely rectangular, dipole and ring offer a measured dynamic phase range of 95°, 153° and 197° respectively at 10 GHz using the proposed design configuration. Moreover, the ring element attains a 107% higher dynamic tunability with a 56% reduction in the reflective area as compared to rectangular element.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Dahri, Muhammad Hashim
author_facet	Dahri, Muhammad Hashim
author_sort	Dahri, Muhammad Hashim
title	Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials
title_short	Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials
title_full	Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials
title_fullStr	Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials
title_full_unstemmed	Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials
title_sort	dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Elektrik dan Elektronik
publishDate	2014
url	http://eprints.uthm.edu.my/1586/1/24p%20MUHAMMAD%20HASHIM%20DAHRI.pdf http://eprints.uthm.edu.my/1586/2/MUHAMMAD%20HASHIM%20DAHRI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1586/3/MUHAMMAD%20HASHIM%20DAHRI%20WATERMARK.pdf
_version_	1747830822869663744

Dynamic tunability enhancement of reflectarray antenna using non-homogeneous dielectric materials

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