A compact high gain dual-band antenna array for WLAN applications

dc.contributor.advisorJoubert, Johan
dc.contributor.coadvisorOdendaal, J.W. (Johann Wilhelm)
dc.contributor.emailu10297589@tuks.co.za
dc.contributor.postgraduateReynders, Vian
dc.date.accessioned2019-10-09T14:23:08Z
dc.date.available2019-10-09T14:23:08Z
dc.date.created2019/09/02
dc.date.issued2019
dc.descriptionDissertation (MEng)--University of Pretoria, 2019.
dc.description.abstractThe continuously growing number of wireless devices and the demand for wireless local area network (WLAN) coverage received a lot of research and design attention during the past decade. The WLAN application is a popular dual-band IEEE standard, which operates in two distinct bands with a large centre frequency ratio. This dissertation presents the design and performance of a compact, high gain, dual-band and directional antenna array meant to be used for such applications. The low band, as stated by the IEEE 802.11b standard, covers the frequency range of 2.400 GHz to 2.484 GHz, and the high band is defined by IEEE 802.11a and starts at 5.150 GHz and stops at 5.850 GHz. The frequency ratio between the centres of the two bands is 2.25:1 and is considered a large ratio. The antenna array design is based on an existing dual-band antenna configuration. A parametric study was conducted on the antenna configuration features to obtain a detailed understanding of the antenna performance changes in relation to the physical parameters. The original design was modified to obtain a new sub-array design which can be used in an array for higher gain performance. The sub-array antenna element consists of one capacitively loaded dipole for the lower 2.4 GHz band and four smaller rectangular dipoles for the high 5.5 GHz band. The low band dipole is fed with a microstrip line whereas the four high band dipoles are fed with a slot line. Four of these sub-array antenna elements are configured into an array for increased gain performance. The final gain of the antenna array was measured as 12 dBi at the 2.4 GHz band and 16 dBi at the 5.5 GHz band. The radiation patterns of both the low and high bands have side lobes 10 dB below the main lobe and front to back lobe ratios of at least 17 dB. The volume of the final antenna is 128 _ 128 _ 12 mm3 and is compact compared to other dual-band antenna arrays. The continuously growing number of wireless devices and the demand for wireless local area network (WLAN) coverage received a lot of research and design attention during the past decade. The WLAN application is a popular dual-band IEEE standard, which operates in two distinct bands with a large centre frequency ratio. This dissertation presents the design and performance of a compact, high gain, dual-band and directional antenna array meant to be used for such applications. The low band, as stated by the IEEE 802.11b standard, covers the frequency range of 2.400 GHz to 2.484 GHz, and the high band is defined by IEEE 802.11a and starts at 5.150 GHz and stops at 5.850 GHz. The frequency ratio between the centres of the two bands is 2.25:1 and is considered a large ratio. The antenna array design is based on an existing dual-band antenna configuration. A parametric study was conducted on the antenna configuration features to obtain a detailed understanding of the antenna performance changes in relation to the physical parameters. The original design was modified to obtain a new sub-array design which can be used in an array for higher gain performance. The sub-array antenna element consists of one capacitively loaded dipole for the lower 2.4 GHz band and four smaller rectangular dipoles for the high 5.5 GHz band. The low band dipole is fed with a microstrip line whereas the four high band dipoles are fed with a slot line. Four of these sub-array antenna elements are configured into an array for increased gain performance. The final gain of the antenna array was measured as 12 dBi at the 2.4 GHz band and 16 dBi at the 5.5 GHz band. The radiation patterns of both the low and high bands have side lobes 10 dB below the main lobe and front to back lobe ratios of at least 17 dB. The volume of the final antenna is 128 _ 128 _ 12 mm3 and is compact compared to other dual-band antenna arrays. The continuously growing number of wireless devices and the demand for wireless local area network (WLAN) coverage received a lot of research and design attention during the past decade. The WLAN application is a popular dual-band IEEE standard, which operates in two distinct bands with a large centre frequency ratio. This dissertation presents the design and performance of a compact, high gain, dual-band and directional antenna array meant to be used for such applications. The low band, as stated by the IEEE 802.11b standard, covers the frequency range of 2.400 GHz to 2.484 GHz, and the high band is defined by IEEE 802.11a and starts at 5.150 GHz and stops at 5.850 GHz. The frequency ratio between the centres of the two bands is 2.25:1 and is considered a large ratio. The antenna array design is based on an existing dual-band antenna configuration. A parametric study was conducted on the antenna configuration features to obtain a detailed understanding of the antenna performance changes in relation to the physical parameters. The original design was modified to obtain a new sub-array design which can be used in an array for higher gain performance. The sub-array antenna element consists of one capacitively loaded dipole for the lower 2.4 GHz band and four smaller rectangular dipoles for the high 5.5 GHz band. The low band dipole is fed with a microstrip line whereas the four high band dipoles are fed with a slot line. Four of these sub-array antenna elements are configured into an array for increased gain performance. The final gain of the antenna array was measured as 12 dBi at the 2.4 GHz band and 16 dBi at the 5.5 GHz band. The radiation patterns of both the low and high bands have side lobes 10 dB below the main lobe and front to back lobe ratios of at least 17 dB. The volume of the final antenna is 128 _ 128 _ 12 mm3 and is compact compared to other dual-band antenna arrays.
dc.description.availabilityUnrestricted
dc.description.degreeMEng
dc.description.departmentElectrical, Electronic and Computer Engineering
dc.description.librarianTM2019
dc.identifier.citationReynders, V 2019, A compact high gain dual-band antenna array for WLAN applications, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/71755>
dc.identifier.otherS2019
dc.identifier.urihttp://hdl.handle.net/2263/71755
dc.language.isoen
dc.publisherUniversity of Pretoria
dc.rights© 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.
dc.subjectUCTD
dc.titleA compact high gain dual-band antenna array for WLAN applications
dc.typeDissertation

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