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Slotted series Iteration log periodic fractal koch antenna with stub-loaded for UHF TVWS applications

Master of Science in Communication Engineering

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Bibliographic Details
Main Author: Nur Akmal, Abd. Rahman
Other Authors: Mohd Faizal, Jamlos, Assoc. Prof. Dr.
Format: Thesis
Language:English
Published: Universiti Malaysia Perlis (UniMAP) 2016
Subjects:
Log-periodic antennas
Antenna arrays
Wireless communication systems
Antennas (Electronics)
Antennas
Online Access:http://dspace.unimap.edu.my:80/xmlui/handle/123456789/72436
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id my.unimap-72436
record_format dspace
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Log-periodic antennas
Antenna arrays
Wireless communication systems
Antennas (Electronics)
Antennas
spellingShingle Log-periodic antennas
Antenna arrays
Wireless communication systems
Antennas (Electronics)
Antennas
Nur Akmal, Abd. Rahman
Slotted series Iteration log periodic fractal koch antenna with stub-loaded for UHF TVWS applications
description Master of Science in Communication Engineering
author2 Mohd Faizal, Jamlos, Assoc. Prof. Dr.
author_facet Mohd Faizal, Jamlos, Assoc. Prof. Dr.
Nur Akmal, Abd. Rahman
format Thesis
author Nur Akmal, Abd. Rahman
author_sort Nur Akmal, Abd. Rahman
title Slotted series Iteration log periodic fractal koch antenna with stub-loaded for UHF TVWS applications
title_short Slotted series Iteration log periodic fractal koch antenna with stub-loaded for UHF TVWS applications
title_full Slotted series Iteration log periodic fractal koch antenna with stub-loaded for UHF TVWS applications
title_fullStr Slotted series Iteration log periodic fractal koch antenna with stub-loaded for UHF TVWS applications
title_full_unstemmed Slotted series Iteration log periodic fractal koch antenna with stub-loaded for UHF TVWS applications
title_sort slotted series iteration log periodic fractal koch antenna with stub-loaded for uhf tvws applications
publisher Universiti Malaysia Perlis (UniMAP)
publishDate 2016
url http://dspace.unimap.edu.my:80/xmlui/handle/123456789/72436
_version_ 1724609904413507584
spelling my.unimap-724362021-10-14T01:20:04Z Slotted series Iteration log periodic fractal koch antenna with stub-loaded for UHF TVWS applications Nur Akmal, Abd. Rahman Mohd Faizal, Jamlos, Assoc. Prof. Dr. Log-periodic antennas Antenna arrays Wireless communication systems Antennas (Electronics) Antennas Master of Science in Communication Engineering The research works in this thesis mainly focusses on the development of slotted series iteration log periodic fractal Koch antenna (S-LPFKA) for ultra high frequency (UHF) television white space (TVWS) spectrum applications. Log periodic, fractal Koch structure and stub technique facilitates the achievement of wide operating frequency band and size miniaturization, besides enhancing directivity and gain. Three different structure of antennas; S-LPFKA, S-LPFKA with rectangular stub-loaded and S-LPFKA with Cshaped stub-loaded have been designed by using 3D simulator software Computer Simulation Technology (CST) to study and verify the effect of each techniques on the performances of the antenna. All the proposed antennas consist of 10 radiating elements of series iteration fractal Koch technique with 30° flare angle on both sides of the substrate in a criss-cross arrangement. All antennas are fabricated on FR-4 substrate with dielectric constant of =4.7 and loss tangent of tan δ=0.019. Both measured and simulated results show an enhancement in bandwidth for all S-LPFKA which covering 100% of the required frequencies from 0.47 GHz to 0.79 GHz when fractal Koch structure and stub technique are employed to the log periodic dipole array (LPDA) antenna. Furthermore, 30.23%, 43% and 48.8% size reduction are achieved for SLPFKA, S-LPFKA with rectangular stub-loaded and S-LPFKA with C-shaped stubloaded, respectively. The proposed antennas recorded linear polarization and unidirectional patterns. The antennas maintain input impedance approximately 50 Ω over UHF TVWS frequencies. The measured results agree well with the simulated results. Those antennas exhibits high gains of between 4 dBi to 7.8 dBi and stable radiation patterns within 0.47 GHz to 0.79 GHz frequency range.The research works in this thesis mainly focusses on the development of slotted series iteration log periodic fractal Koch antenna (S-LPFKA) for ultra high frequency (UHF) television white space (TVWS) spectrum applications. Log periodic, fractal Koch structure and stub technique facilitates the achievement of wide operating frequency band and size miniaturization, besides enhancing directivity and gain. Three different structure of antennas; S-LPFKA, S-LPFKA with rectangular stub-loaded and S-LPFKA with Cshaped stub-loaded have been designed by using 3D simulator software Computer Simulation Technology (CST) to study and verify the effect of each techniques on the performances of the antenna. All the proposed antennas consist of 10 radiating elements of series iteration fractal Koch technique with 30° flare angle on both sides of the substrate in a criss-cross arrangement. All antennas are fabricated on FR-4 substrate with dielectric constant of =4.7 and loss tangent of tan δ=0.019. Both measured and simulated results show an enhancement in bandwidth for all S-LPFKA which covering 100% of the required frequencies from 0.47 GHz to 0.79 GHz when fractal Koch structure and stub technique are employed to the log periodic dipole array (LPDA) antenna. Furthermore, 30.23%, 43% and 48.8% size reduction are achieved for SLPFKA, S-LPFKA with rectangular stub-loaded and S-LPFKA with C-shaped stubloaded, respectively. The proposed antennas recorded linear polarization and unidirectional patterns. The antennas maintain input impedance approximately 50 Ω over UHF TVWS frequencies. The measured results agree well with the simulated results. Those antennas exhibits high gains of between 4 dBi to 7.8 dBi and stable radiation patterns within 0.47 GHz to 0.79 GHz frequency range. 2016 2021-10-14T01:20:04Z 2021-10-14T01:20:04Z Thesis http://dspace.unimap.edu.my:80/xmlui/handle/123456789/72436 en Universiti Malaysia Perlis (UniMAP) Universiti Malaysia Perlis (UniMAP) School of Computer and Communication Engineering
score 13.209306

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