Since the second edition of this book was published in 1996, planar transmission line technology has progressed considerably due to developments in ultrawideband (UWB) communications, imaging, and RFID applications. In addition, the simultaneous demands for compactness of wireless electronic devices while meeting improved performance requirements, necessitates increased use of computer-aided design, simulation, and analysis by microwave engineers. This book is written to help engineers successfully meet these challenges. It covers the development of governing equations, basis functions, Green's function and typical results. It details the use of simulation software in the design of complex devices and understanding the connection between data collected from simulation software and the actual design process. It includes over 1,200 equations.