This book provides a fundamental understanding of wireless communication, radio frequency (RF), and microwave devices for next-generation wireless communications. Various security issues and their solutions are included, and the book also covers machine learning techniques for advanced communications and antenna design. 5G and Beyond Wireless Network, RF and Microwave Devices: Modern Design and Optimization provides a thorough introduction to antenna design and 5G and B5G wireless networks, as well as cutting-edge technologies that aid in antenna/network design and development. Novel antenna designs and the latest technologies for 5G and future wireless networks are discussed, including multiple-input and multiple-output (MIMO) antennas, reconfigurable antennas, dielectric resonator antennas, metamaterials, reconfigurable intelligent surfaces, and meta-surfaces. Written by leading experts, the book offers insights into the modeling of device-to-device (D2D) networks, UAV-assisted communications, and RIS-assisted networks. Additionally, it explores antenna design and wireless communication networks using machine learning, artificial intelligence, deep learning, and optimization techniques for advanced communication networks, as well as the relevant security issues associated with such systems. This book serves as a valuable resource to researchers and graduate students working on next-generation advanced wireless communications.