Dealing with the electromagnetic issue might bring a sort of discontinuous and nondifferentiable
regions. Thus, it is of great interest to implement an appropriate optimisation
approach, which can preserve the computational resources and come up with a global
optimum. While not being trapped in local optima, as well as the feasibility to overcome some
other matters such as nonlinear and phenomena of discontinuous with a large number of
variables.
Problems such as lengthy computation time, constraints put forward for antenna
requirements and demand for large computer memory, are very common in the analysis due
to the increased interests in tackling high-scale, more complex and higher-dimensional
problems. On the other side, demands for even more accurate results always expand
constantly. In the context of this statement, it is very important to find out how the recently
developed optimization roles can contribute to the solution of the aforementioned problems.
Thereafter, the key goals of this work are to model, study and design low profile antennas for
wireless and mobile communications applications using optimization process over a
computational electromagnetics numerical solution. The numerical solution method could be
performed over one or hybrid methods subjective to the design antenna requirements and
its environment.
Firstly, the thesis presents the design and modelling concept of small uni-planer Ultra-
Wideband antenna. The fitness functions and the geometrical antenna elements required for
such design are considered. Two antennas are designed, implemented and measured. The
computed and measured outcomes are found in reasonable agreement. Secondly, the work
is also addressed on how the resonance modes of microstrip patches could be performed
using the method of Moments. Results have been shown on how the modes could be
adjusted using MoM. Finally, the design implications of balanced structure for mobile
handsets covering LTE standards 698-748 MHz and 2500-2690 MHz are explored through
using firefly algorithm method. The optimised balanced antenna exhibits reasonable
matching performance including near-omnidirectional radiations over the dual desirable
operating bands with reduced EMF, which leads to a great immunity improvement towards
the hand-held. / General Secretariat of Education and Scientific Research Libya
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/17217 |
| Date | January 2018 |
| Creators | Abdussalam, Fathi M.A. |
| Contributors | Abd-Alhameed, Raed |
| Publisher | University of Bradford, Faculty of Engineering and Informatics |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | Thesis, doctoral, PhD |
| Rights | <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc-nd/3.0/88x31.png" /></a><br />The University of Bradford theses are licenced under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/">Creative Commons Licence</a>. |
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