This book provides a wide spectrum of current trends in the design of microwave and millimeter circuits and systems. In addition, the book identifies the state-of-the art challenges in microwave and millimeter wave circuits systems design, such as behavioral modeling of circuit components, software radio and digitally enhanced front-ends, and much more. Each chapter treats a selected problem and challenge within the field of Microwave and Millimeter wave circuits, and contains case studies and examples. This book serves as an excellent reference for engineers, researchers, research project managers and engineers working in R&D.