This is continuation of Field theory I with emphasis on theoretical concepts of transmission lines, waveguides, cavity resonators, antennas and radiation, and optical properties of electric fields. It introduces the fundamentals of high frequency circuit analysis and design, from electromagnetic theory to microwave systems. Starting with a concise presentation of the electromagnetic theory, the course leads to passive and active microwave circuit and the understanding of different concepts of impedance matching. It also provides the concept of wave propagation in different transmission media and the wave reflection from a media interface. Students will learn to use the Smith Chart. Other topics include transmission of EM waves in the Ionosphere, Waveguides and Optical Properties of Electric Fields.