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https://ptsldigital.ukm.my/jspui/handle/123456789/486988Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Mohammad Tariqul Islam, Assoc. Prof. Dr. | - |
| dc.contributor.author | Mohammad Rashed Iqbal Faruque (P48969) | - |
| dc.date.accessioned | 2023-10-11T02:27:16Z | - |
| dc.date.available | 2023-10-11T02:27:16Z | - |
| dc.date.issued | 2012-05-17 | - |
| dc.identifier.other | ukmvital:120322 | - |
| dc.identifier.uri | https://ptsldigital.ukm.my/jspui/handle/123456789/486988 | - |
| dc.description | The widespread use of portable wireless devices is a health concern due to biological effects of microwaves. It is important that the biological effects of electromagnetic waves are minimal, at least at the level of their clinical significance, so that health risk can be assessed. The possible health risk of mobile communication handset due to its electromagnetic (EM) interface with human head and the means of reducing the impact of this interface have appeared as a global concern. There is a crying need to evaluate the electromagnetic absorption by human head during the uses of electronic devices such as mobile phone. This thesis focuses on designing and developing a novel triangular shape metamaterials (TMMs) to reduce SAR in human head model. The muscle tissue of human head is analyzed to show the SAR reduction effect in this research. The local SAR induced in spherical, cubical, and realistic human head models exposed to a mobile phone is also investigated in this thesis. The new TMMs structure consists of two concentric triangular ring of conductive material which exhibiting a resounding electric response at microwave frequency is employed in this work. The finite-difference time-domain method with lossy- Drude model is adopted in this analysis by using CST Microwave Studio . The novel TMMs is also measured in cheek and tilted position utilizing COMOSAR system. The technique of SAR reduction is discussed and the effects of attaching location, distance, and size of metamaterials, perfect electric conductor (PEC), and materials on the SAR reduction are investigated. The average difference of local maximum SAR between realistic and these (cubical, spherical) models are approximately within 12% at 900 MHz and 9% at 1800 MHz respectively. A comparison analysis of SAR induced in the realistic human head model for homogeneous and inhomogeneous cases are also discussed. From the results, it can be observed that the local maximum SAR induced in the homogeneous human head model is larger than that induced in the inhomogeneous human head model. Also, this thesis includes an investigation of the effects of different antennas (monopole, helix, patch and PIFA) on human head tissues. Materials have achieved a 47.02 % reduction of the initial SAR value for the case of 1 gm SAR and TMMs have achieved 50.82 % reduction for the cases of 1 gm SAR. These results suggest a guideline to choose triangular types of metamaterials with the maximum SAR reducing effect for a phone model.,Certification of Master's / Doctoral Thesis" is not available | - |
| dc.language.iso | eng | - |
| dc.publisher | UKM, Bangi | - |
| dc.relation | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | - |
| dc.rights | UKM | - |
| dc.subject | Radiation | - |
| dc.subject | Microwaves | - |
| dc.subject | Electromagnetic waves | - |
| dc.subject | Universiti Kebangsaan Malaysia -- Dissertations | - |
| dc.subject | Dissertations, Academic -- Malaysia | - |
| dc.title | Design and analysis of metamaterial for electromagnetic radiation and specific absorption rate using human head models | - |
| dc.type | Theses | - |
| dc.format.pages | 138 | - |
| dc.identifier.callno | QC661.F347 2012 3 tesis | - |
| dc.identifier.barcode | 005303(2021)(PL2) | - |
| Appears in Collections: | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_120322+SOURCE1+SOURCE1.0.PDF Restricted Access | 1.43 MB | Adobe PDF |  View/Open |
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