Review of p-n junction theory, depletion layer width and junction capacitance, Schottky barrier diodes, PIN diodes and applications in switches and phase shifters, reactors and step recovery diodes, tunnel diodes and circuits, GUNN devices and circuits, avalanche diodes, IMPATT, TRAPATT and BARRITT diodes, microwave bipolar junction transistors (BJT) and field effect transistors (FET), small signal amplifier design, new devices like HEMT and Si-Ge devices, Klystrons, Magnetrons and traveling wave tubes.