MOHAMMED BELHADJ, KHOULOUDFerouani, Souheyla2025-10-012025-10-012025http://dspace.univ-temouchent.edu.dz/handle/123456789/6871This thesis focuses on the design, optimization, and development of intelligent, miniature, and reconfigurable microstrip antennas tailored for modern wireless technologies such as 5G, Wi-Fi 6, and the Internet of Things (IoT). Two types of frequency-reconfigurable antennas were developed: a rectangular printed antenna, providing reliable coverage at 3.53 GHz and 5.0 GHz for 5G and Wi-Fi 6 applications, and a pentagonal patch antenna, covering a wide frequency range (2.438 GHz to 7.805 GHz) suitable for various applications, including Wi-Fi, LTE, radar, satellite, and IoT. The study also focused on Yagi antennas with reconfigurable radiation patterns using PIN diodes. The single-element Yagi antenna generates a radiation pattern in the ON mode and is inactive in the OFF mode. The two-element Yagi antenna, with three distinct modes (ON-ON, ON-OFF, OFF-ON), enables effective beam reconfiguration for WiMAX, and 5G technologies. The results demonstrate that these reconfigurable antennas optimize spectrum utilization while improving signal coverage and quality. They provide efficient and flexible solutions for modern telecommunications, contributing to more effective networks adapted to the evolving needs of a connected environment.frAntenne reconfigurable, Antenne imprimée, Diode PIN, Réseau d’antennes, S11, Diagramme de rayonnement.Reconfigurable antenna, Printed antenna, PIN diode, Antenna arrays, S11, Radiation pattern.Thesis