Gigahertz and Terahertz Technologies for Broadband Communications: Second Edition is a cutting-edge resource for understanding current, emerging, and future broadband communications systems, as well as the industry's major players and their products. This second edition covers more material on the massive and often radical technological developments that have taken place in the past two decades. This book spans RF, optical technology, and engineering at a practical level making it relevant to engineers working on 5G, 6G terrestrial and space and satellite applications. It helps engineers make design critical choices both at component and system level and increases awareness of the specific design challenges that need to be addressed in high frequency RF and fibre and free space optical transmission systems.