KHALDI, YoucefHALLALI, YassineEnca/ ABED, Ahcéne2023-09-202023-09-202023-07-16http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/40883In conclusion, the next generation of cellular network technology, 5G, brings significant improvements in data speeds, latency, and connectivity. It comprises the Radio AccessNetwork, CoreNetwork, andUser Equipment, all working together to provide enhanced capabilities. Antennas play a crucial role in 5G networks, utilizing millimeter waves and massiveMIMO technology for beamforming, which improves signal strength and reduces interference. One important frequency band for 5G operation is the 28 GHz band. This frequency range offers several benefits for wireless communication. Firstly, it provides a good balance between coverage and capacity. The 28 GHz frequency can propagate over moderate distances while still allowing for high data rates. This makes it suitable for deploying 5G networks in urban areas where a dense population requires both wide coverage and high capacity. Furthermore, the 28 GHz band enables efficient spectrum utilization. It allows for the allocation of larger bandwidths, which translates to higher data transfer rates. With 5G, the 28 GHz frequency can support wider channels, providing faster download and upload speeds for various applications, including video streaming, online gaming, and large file transfers. In terms of antenna design and simulation, HFSS (High Frequency Structure Simulator) proves to be a valuable tool. HFSS allows engineers to analyze and optimize antennas operating at the 28 GHz frequency band. By simulating the behavior of the antenna structures, it becomes possible to fine-tune their parameters and improve their performance characteristics such as gain, radiation pattern, and efficiency. The utilization of the 28 GHz frequency in 5G networks, coupled with effective an- tenna design using tools like HFSS, contributes to the realization of the full potential of 5G technology. The 28 GHz band offers a favorable balance between coverage and capacity, enabling efficient and high-speed wireless communication in urban areas. As 5G continues to evolve, the 28 GHz frequency will play a crucial role in delivering seamless connectivity and unlocking the benefits of emerging applications and services, transforming various industries and enhancing user experiences.enThesis