Design of dielectric resonator antenna for wireless communication
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Date
2009
Authors
Othman, Mohamadariff
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Abstract
This 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.
Description
Master
Keywords
Science Physic , Dielectric resonator antenna , Wireless communication