Etude et Optimisation des Réseaux d’Antennes Imprimées
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Date
2021-11
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Publisher
Université de M'sila
Abstract
The present thesis deals with three essential problems found for wireless telecommunications
applications.
The first thematic concerns the problem of monitoring linear antenna arrays using grey wolf
optimization method (GWO). When an abnormal event (fault) affects an array of antenna elements,
the radiation pattern changes and significant deviation from the desired design pattern can occur. In
this work, reconfiguration of the amplitude and phase distribution of the remaining working elements
in a failed array is considered. This latter can improve the side lobe levels (SLL) and also maintain
the main lobe in the desired direction. Simulation results clearly have shown the effectiveness of the
proposed algorithm to monitor the failure correction of linear antenna arrays.
The second problem deals with the synthesis of symmetrical and non-symmetrical linear
antenna arrays using a new optimization technique, named as modified grey wolf optimization
(MGWO) algorithm. The synthesis of circular antenna arrays using coco search technique is also
considered. To matches the desired pattern as closely as possible, we considered the optimization of
interspacing elements, weights amplitude and phase excitation of the linear antenna array. It has been
demonstrated that the performance of a printed linear antenna array depends on all parameters, in
which simultaneous optimization is imperative to maximize its characteristics. The obtained results
show the effectiveness and the flexibility of the proposed algorithm in terms of minimized lateral
lobe level and the convergence speed towards the desired solution compared to those of other
techniques in the literature.
The last research issue presented in this dissertation deals with the problem of designing
rectangular patch antennas with two feeding techniques. To this end, we were simulated using the
HFSS software two rectangular antennas operating at the frequency 2.4 GHz and 10 GHz
respectively. The results of the simulation (as reflection coefficient…) show a shift between the
frequencies required and the frequencies found. To remedy this problem, an analysis and a parametric
study of this type of antennas has been carried out. This last allowed the frequencies to be brought
exactly to the required ones. The optimized antennas are then networked with two elements fed in
parallel and in series at a quarter waves respectively. In both cases, networking mainly increases gain
and directivity.
Description
Keywords
Antenna design, antenna arrays, array factor, failure correction, Printed antennas, radiation pattern, optimization methods, HFSS, MGWO.