Design of multibeam antenna for wireless local area network applications

The current trend in most access point in conventional wireless local area network (WLAN) is to use omnidirectional antennas, which radiates and receives power equally in all directions. This attribute however gives result of lower power efficiency and decrease network performance due to co-channel...

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Main Author:	Ibrahim, Siti Zuraidah
Format:	Thesis
Language:	English
Published:	2007
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/11414/1/SitiZuraidahIbrahimMFKE2007.pdf
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id	my-utm-ep.11414
record_format	uketd_dc
spelling	my-utm-ep.114142018-07-25T08:00:06Z Design of multibeam antenna for wireless local area network applications 2007-12 Ibrahim, Siti Zuraidah TK Electrical engineering. Electronics Nuclear engineering The current trend in most access point in conventional wireless local area network (WLAN) is to use omnidirectional antennas, which radiates and receives power equally in all directions. This attribute however gives result of lower power efficiency and decrease network performance due to co-channel interference that arrived from undesired directions. One of the proposed solutions to overcome these constraints is to use multibeam antenna on WLAN access points. Multibeam antennas are antenna arrays that make use of beamforming networks to produce multiple independent beams that directed to different directions. In this project, multibeam antenna comprises of linear antenna array and beamforming network is presented. It was designed at 2.4 GHz to suit the application of WLAN at 802.11b/g. Butler Matrix 4 x 4 is chosen as a beamforming network which was designed to provide four different progressive phase shifts, -45°, +135°, -135°, +45° that coupled to antenna array. It is made up from four 90° hybrid coupler, two 0 dB crossover and two -45° phase shifter. Each component is designed and simulated using Agilent ADS software and fabricated on FR4 board. This network is then combined with a linear antenna arrays with the aim to produce four independent beams at four different directions. Three types of antenna array that having different kind of radiation patterns have been implemented which are square patch antenna, 4 x 2 planar antenna array and dipole antenna. The obtained result shows that 4 beams are generated by each design where square patch antenna array produce Half Power Beamwidth, HPBW for each beams about 30° and manage to cover 120° of coverage area, 4 x 2 antenna array has HPBW about 7° and cover 30° while dipole antenna produce two kind of beams, broader and narrower beams. Finally, it can be concluded that the objectives of this project are achieved. 2007-12 Thesis http://eprints.utm.my/id/eprint/11414/ http://eprints.utm.my/id/eprint/11414/1/SitiZuraidahIbrahimMFKE2007.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Ibrahim, Siti Zuraidah Design of multibeam antenna for wireless local area network applications
description	The current trend in most access point in conventional wireless local area network (WLAN) is to use omnidirectional antennas, which radiates and receives power equally in all directions. This attribute however gives result of lower power efficiency and decrease network performance due to co-channel interference that arrived from undesired directions. One of the proposed solutions to overcome these constraints is to use multibeam antenna on WLAN access points. Multibeam antennas are antenna arrays that make use of beamforming networks to produce multiple independent beams that directed to different directions. In this project, multibeam antenna comprises of linear antenna array and beamforming network is presented. It was designed at 2.4 GHz to suit the application of WLAN at 802.11b/g. Butler Matrix 4 x 4 is chosen as a beamforming network which was designed to provide four different progressive phase shifts, -45°, +135°, -135°, +45° that coupled to antenna array. It is made up from four 90° hybrid coupler, two 0 dB crossover and two -45° phase shifter. Each component is designed and simulated using Agilent ADS software and fabricated on FR4 board. This network is then combined with a linear antenna arrays with the aim to produce four independent beams at four different directions. Three types of antenna array that having different kind of radiation patterns have been implemented which are square patch antenna, 4 x 2 planar antenna array and dipole antenna. The obtained result shows that 4 beams are generated by each design where square patch antenna array produce Half Power Beamwidth, HPBW for each beams about 30° and manage to cover 120° of coverage area, 4 x 2 antenna array has HPBW about 7° and cover 30° while dipole antenna produce two kind of beams, broader and narrower beams. Finally, it can be concluded that the objectives of this project are achieved.
format	Thesis
qualification_level	Master's degree
author	Ibrahim, Siti Zuraidah
author_facet	Ibrahim, Siti Zuraidah
author_sort	Ibrahim, Siti Zuraidah
title	Design of multibeam antenna for wireless local area network applications
title_short	Design of multibeam antenna for wireless local area network applications
title_full	Design of multibeam antenna for wireless local area network applications
title_fullStr	Design of multibeam antenna for wireless local area network applications
title_full_unstemmed	Design of multibeam antenna for wireless local area network applications
title_sort	design of multibeam antenna for wireless local area network applications
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2007
url	http://eprints.utm.my/id/eprint/11414/1/SitiZuraidahIbrahimMFKE2007.pdf
_version_	1747814851259924480

Design of multibeam antenna for wireless local area network applications

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