This book discusses a wide range of RF topics with emphasis on physical aspects, including EM and voltage waves, transmission lines, passive circuits, antennas. New coverage includes the consistent use of modern RF tools such as RF circuit simulation, EM simulation, computerized smith chart in various examples that show how the methods can be applied productively in RF engineering practice. Examples that illustrate the theoretical parts are close to real world problems, so readers can directly use the methods in their own work context.