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Composite plaster cement-based electromagnetic wave absorber
Dissertation (MEng)--University of Pretoria, 2013.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2014
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| _version_ | 1867613674502356992 |
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| access_status_str | Open Access |
| author2 | Maharaj, Bodhaswar Tikanath Jugpershad |
| author_browse | Maharaj, Bodhaswar Tikanath Jugpershad |
| author_facet | Maharaj, Bodhaswar Tikanath Jugpershad |
| collection | Thesis |
| dc_rights_str_mv | © 2013 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. |
| description | Dissertation (MEng)--University of Pretoria, 2013. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/33352 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:54.193Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/33352 Composite plaster cement-based electromagnetic wave absorber Maharaj, Bodhaswar Tikanath Jugpershad pretoriusjc@tut.ac.za Pretorius, Johann Christiaan Electromagnetic waves Absorber Reflection loss Shielding effectiveness Propagation loss Building material GSM frequency bands Wireless communications, WiFi Electromagnetic interference UCTD Dissertation (MEng)--University of Pretoria, 2013. The electromagnetic wave absorption characteristics of composite cement-based building material have attracted much interest in recent times. Researchers have mainly focused on the 2 GHz to 12 GHz frequency range. Mobile and wireless communication systems use frequencies from 800 MHz upwards. The determination of characteristics such as reflection loss, absorption, attenuation and shielding effectiveness are crucial in the evaluation and development of these materials for the building industry. Absorption is an indication of how much of the EMW energy enters the material. Attenuation indicates how much of the absorbed energy is converted into other forms of energy by the material. Shielding effectiveness (SE) is a combination of reflection loss, attenuation and multiple internal reflections and attenuations. This research determined these characteristics by measuring the S11 and S21 parameters of the composite cement-based material in the GSM and WiFi frequency bands. The time domain gating function of a vector network analyser is applied to measure the reflection from the material. The data was then used to obtain the reflection and absorption losses in the frequency bands. The transmission loss was measured by placing the sample in the propagation path between two antennas. MnZn-ferrite and electrolytic manganese dioxide in powder form were evaluated as absorber material to increase the permeability of the cement-based material to improve absorption and attenuation capabilities to create a cost-effective practical electromagnetic wave absorber. The compound of the cement-based material was cement, sifted river sand and filler powder. The results achieved in the research showed the uniqueness of electrolytic manganese dioxide as filler in composite cement based material for electromagnetic wave shielding effectiveness improvement. The combined measurement techniques used in this research were uniquely used to determine the required electromagnetic wave absorption characteristics and shielding effectiveness of 10 dB was measured in the GSM850 and GSM900 frequency bands. gm2014 Electrical, Electronic and Computer Engineering unrestricted 2014-02-11T05:12:44Z 2014-02-11T05:12:44Z 2013-09-04 2013 Dissertation Pretorius, JC 2013, Composite plaster cement-based electromagnetic wave absorber, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/33352> E13/9/1006/gm http://hdl.handle.net/2263/33352 en © 2013 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. application/pdf University of Pretoria |
| spellingShingle | Electromagnetic waves Absorber Reflection loss Shielding effectiveness Propagation loss Building material GSM frequency bands Wireless communications, WiFi Electromagnetic interference UCTD Composite plaster cement-based electromagnetic wave absorber |
| title | Composite plaster cement-based electromagnetic wave absorber |
| title_full | Composite plaster cement-based electromagnetic wave absorber |
| title_fullStr | Composite plaster cement-based electromagnetic wave absorber |
| title_full_unstemmed | Composite plaster cement-based electromagnetic wave absorber |
| title_short | Composite plaster cement-based electromagnetic wave absorber |
| title_sort | composite plaster cement based electromagnetic wave absorber |
| topic | Electromagnetic waves Absorber Reflection loss Shielding effectiveness Propagation loss Building material GSM frequency bands Wireless communications, WiFi Electromagnetic interference UCTD |
| url | http://hdl.handle.net/2263/33352 |