BELHIA Nour El HoudaBOUKROLDA HafssaFerouani Souheyla2026-09-282026-09-282026https://dspace.univ-temouchent.edu.dz/handle/123456789/7672This Master's Thesis presents the design and optimization of a selective and miniaturized printed antenna intended for 3G, 4G, and 5G mobile telecommunication networks. The work is based on the development of a rectangular patch antenna whose performance was enhanced through the introduction of slots and the integration of Defected Ground Structure (DGS) resonators in the ground plane. Electromagnetic simulations carried out using CST Microwave Studio validate a precise multiband operation at 1.83 GHz, 2.64 GHz, and 3.53 GHz. The proposed antenna exhibits good impedance matching, high isolation between the operating bands, and a miniaturization rate of 52.82%. The achieved gains are 2.34 dBi at 1.83 GHz (3G), 3.89 dBi at 2.64 GHz (4G), and 1.24 dBi at 3.53 GHz (5G). Owing to its compact size and filtering capabilities, the proposed antenna represents a promising solution for next- generation wireless communication systemsfrpatch antennamultiband3G4G5Gimpedance matchingminiaturizationDGSfrequency selective surfaceCST Studio Suitewireless communications.Thesis