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Frequency Reconfigurable Antennas for Airborne Applications.

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Hmouda, Abdurahman (2017). Frequency Reconfigurable Antennas for Airborne Applications. Mémoire. Québec, Université du Québec, Institut national de la recherche scientifique, Maîtrise en télécommunications.

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Résumé

With the widespread improvement of wireless communication systems and appearing the new generation of mobile telecommunications such as 4G as well as 5G, a transmission of information with high data rate is feasible. Antenna is an important part of telecommunication systems where the information is transmitted and received. Most importantly, to improve the communication link and cover more users, in particular in base station antenna, it is necessary to steer the beam radiation of the antenna. This can be carried out mechanically as well as electronically which each one has its drawback and advantage. In mechanical approach, the installation infrastructure brings more difficulty. Also, in electronic methods due to using the phase shifter, it incurs a large loss and complexity to the design. In this thesis, first and foremost, a reconfigurable radiation pattern antenna based on frequency selective surfaces is introduced. To implement that idea, a modified electric-field coupled (ELC) resonators is presented, which works at 2.4 GHz. To transmit and reflect the illuminated power a pin diode is integrated in the middle of ELC resonator, where by turning “on” or “off”, the resonant frequency of transmission coefficient is shifted to a desired frequency band. Then, the stair-case monopole antenna operating at 2.4 GHz is proposed in the next part which is surrounded by octagon FSS walls, where each one consists of a 2x3 ELC inclusions. By switching “on” three FSS walls and keeping remaining walls in off-state, the radiation pattern in azimuth plane is switching from omnidirectional to directional pattern. To validate, a prototype of antenna along with eight FSS walls incorporated by pin-diode is fabricate and attached to the control unit part. The measured reflection coefficient of the antenna is less than -10 dB over 2.35-2.55 GHz. The measured radiation pattern in H-plane clearly shows a directional beam in different states with a measured realized gain of more than 5 dBi. To receive a maximum power in a random angle, a transmitted antenna propagates power and the aforementioned antenna with FSS panel is switched in 8 cases by control unit part. Finally, a design of control unit interface with proposed reconfigurable pattern antenna is presented and discussed in more details.

Type de document: Thèse Mémoire
Directeur de mémoire/thèse: Denidni, Tayeb A.
Mots-clés libres: Frequency reconfigurable antennas; telecommunications
Centre: Centre Énergie Matériaux Télécommunications
Date de dépôt: 03 juill. 2018 15:01
Dernière modification: 03 juill. 2018 15:01
URI: http://espace.inrs.ca/id/eprint/6930

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