Design of dielectric resonator antenna for wireless communication

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dc.contributor.authorOthman, Mohamadariff
dc.date.accessioned2014-10-27T04:13:45Z
dc.date.available2014-10-27T04:13:45Z
dc.date.issued2009
dc.descriptionMasteren_US
dc.description.abstractThis dissertation discussed on the design of small, compact dielectric resonator antenna (DRA) and the study on the shape of dielectric resonator (DR) for DRA as well as to enhance the bandwidth of DRA. In order to reduce the volume of DRA, silver paste is applied. This can be done by painting it on the surface of DRA and the comparison is made between the DRA with and without silver paste. For wideband DRA design, two approaches are implemented. One is by using silver paste in the form of ring shape and another one is by using two DRs simultaneously. Ring-shape silver paste is painted on the DR surface to produce additional capacitance and inductance for wideband operational DRA whereas two DRs with same permittivity of 37.1 are used to generate dual resonant frequencies which merge together to form wideband DRA. Investigation on the shape of DRA involved DR in the form of cylindrical, rectangular and circular sector. Subsequently, comparison between all different shapes of DR are made. For the purpose of obtaining invaluable insight on the design, CST Microwave Studio is used. Most of DR is made by using solid-state reaction while only ZrSnTiO DR which is already available in the form of cylindrical is straightly purchased. Each DRA design undergoes input impedance, S-parameter and radiation pattern measurement. Compact DRA operating at 2.46 GHz is achieved by utilizing silver paste. Resonant frequency is reduced from 3.575 GHz to 2.46 GHz once the DR is covered with silver paste. Hence, DRA with silver paste is smaller than DRA without silver paste when DRA operates at 2.46 GHz with no major different on the field pattern. For the wideband DRA, loading a strip in the form of ring on the surface of cylindrical DRA produces bandwidth of up to 20% or around 1 GHz. However, the radiation pattern is slightly different within the range of frequencies due to the modes which produce different radiation pattern. Wideband DRA is also successfully designed by using two DRs resulted in two resonant frequencies of 11.92 GHz and 12.64 GHz and produced impedance bandwidth of 8.87 % or 1.09 GHz. Lastly, the study conducted on the shape of DRA revealed that three different shape of DR produces different resonant frequencies. This highlights that the shape of DR in the form of cylindrical, rectangular and circular sector DRA has big influences on DRA performance.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/159
dc.language.isoenen_US
dc.subjectScience Physicen_US
dc.subjectDielectric resonator antennaen_US
dc.subjectWireless communicationen_US
dc.titleDesign of dielectric resonator antenna for wireless communicationen_US
dc.typeThesisen_US
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