Textbook in PDF format This book presents a comprehensive and in-depth exploration of the intricate design process and advanced modeling techniques employed in the creation of cutting-edge antenna geometries specifically tailored to meet the demands of Sub-6 GHz 5G wireless applications and communication systems. The authors provide valuable insights into the selection of flexible substrates, which serve as the foundation for the production of versatile antennas capable of seamlessly integrating into the rapidly evolving 5G and MIMO landscapes