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Title:	Design and analysis of flexible material based metamaterial and antenna for microwave applications
Authors:	Md. Atiqur Rahman (P83348)
Supervisor:	Mohammad Rashed Iqbal Faruque, Assoc. Prof. Dr.
Keywords:	Microwave antennas Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia
Issue Date:	5-Nov-2018
Description:	Development of materials having flexibility, low dielectric constant and tangent losses are greatly demandable in the field of wireless technology. To overcome the shortcoming of the onventional metamaterials and antennas, as those are normally hard, fragile and have no flexibility, the demand of flexible material is increasing day by day. The conventional metamaterials and antennas are usually fabricated on available FR-4 and RT/Duroid dielectric materials, where dielectric constant cannot be arbitrarily selected. Hence, the degree of freedom in designing metamaterials and antennas are very poor. The objective of this thesis is to synthesis, characterize the flexible nickel aluminate (NiAl2O4) material using the sol-gel method and used as a substrate material of metamaterials and antennas for microwave applications. The nickel aluminate material is analyzed using the X-ray diffraction and scanning electron microscope analysis. Relative permittivity and dielectric loss tangent of the synthesize materials were restrained by Dielectric Assessment Kit (DAK) dielectric measurement kit. The presented metamaterial and antenna are designed, investigated by utilizing the Computer Simulation Technology (CST) microwave studio electromagnetic simulator. The Nicolson-Ross-Wire method is used to investigate the double negative characteristics of the designed flexible metamaterial structures. At 36% concentration of nickel the proposed flexible metamaterial shows measured resonances at 8.34 GHz, 12.78 GHz and 14.32 GHz as well as at 42% concentration of nickel another designed metamaterial shows the measured resonances at 10.57 GHz and 11.21 GHz. So, the designed metamaterials are applicable for X-band and Kuband (at 36% concentration) as well as X-band (at 42% concentration) applications. Moreover, at 36% concentration of nickel the prepared flexible antenna measured resonance bandwidth of 5.25 GHz from 8.15 to 13.50 GHz. The measured maximum gain and efficiency are 4.0 dBi and 90%, respectively. Similarly, at 42% concentration of nickel the fabricated flexible antenna measured resonance bandwidth are from 6.5 to 8.85 GHz (bandwidth of 2.35 GHz) and 14 to 15 GHz (bandwidth of 1 GHz). In addition, the measured maximum and efficiency are sequentially 4.75 dBi and 91%. Finally, both antennas have directional radiation patterns and applicable for X-band and Ku-band (at 36% concentration) as well as C-band and Ku-band (at 42% concentration) applications.,Master of Science
Pages:	133
Call Number:	TK7871.6.M393 2018
Publisher:	UKM, Bangi
Appears in Collections:	Institute of Climate Change / Institut Perubahan Iklim

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