Introduction -- The emergency of 5G -- Data transfer -- Flexible antennas -- Wideband 4-port MIMO antennas -- Sub-6 GHz 5G and WLAN frequency bands -- Ultra-wide band as an UWB band (3.1 to 10.6 GHz) -- Smartphone terminal applications -- Flexible 4-port circularly polarized MIMO antenna for Sub-6 GHz applications -- Conclusion.

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. Delving into the depths of antenna design, this book highlights the key aspects surrounding flexible MIMO antennas, showcasing their remarkable compatibility within compact spaces. The authors elucidate the intricacies involved in creating these antennas, illuminating their ability to adapt to challenging environmental conditions while maintaining exceptional performance. Furthermore, the authors delve into the fascinating realm of optimized flexibleantenna arrays for MIMO systems, employing both transparent and non-transparent materials. The development of such arrays entails a meticulous optimization process, where a delicate balance between performance, form factor, and functionality is achieved. By shedding light on this complex process, the book equips readers with the knowledge and tools necessary to engineer high-performing, flexible antenna arrays for advanced wireless communication systems. The book embraces a broad scope by encompassing various substrate materials and fabrication techniques. This inclusive approach ensures its relevance and applicability to a wide range of readers, including novice researchers, postgraduate students, research scholars, as well as seasoned professionals and experts in the field of antennas hailing from diverse industries and academic institutions. Moreover, undergraduate students pursuing degrees in Communication Engineering, Electronics Engineering, and Antennas for Wireless Communication Systems will find this book to be an indispensable resource, offering highly pertinent and enlightening content that bridges the gap between theoretical concepts and real-world antenna design challenges. Explores flexible antennas for 5G/MIMO, focusing on substrates used in manufacturing for comprehensive understanding; Showcases flexible Transparent/Non-transparent MIMO antennas designed for uneven surfaces and compact spaces; Details design and development for MIMO arrays with flexible substrates, empowering readers in 5G/MIMO exploration.