Microwave transmission lines include coaxial cables, waveguides, and strip lines. Strip lines have configurations like microstrip lines, parallel strip lines, coplanar strip lines, and shielded strip lines. Microstrip lines use a conducting strip separated from a ground plane by a dielectric substrate. They have quasi-TEM mode transmission and characteristic impedances typically between 50-150 ohms. Power losses in microstrip lines include ohmic, dielectric, and radiation losses. The document derives equations for microstrip line characteristic impedance and propagation properties, and discusses sources of loss and quality factors.