Waveguides with metallic boundaries, Mode orthogonality, Modal expansion Excitation by simple sources. Constant impedance wall waveguides. The corrugated waveguide as a low crosspolar radiator. Waveguides with imperfect walls: The earth Ionosphere guide and the Tunnel Guide as examples of natural waveguides. Dielectric waveguides: i) The Optical Fiber Guide, ii) Millimeter waveguides. The Microstrip line and the Coplanar Waveguide: Characteristics of single and coupled lines. Numerical methods for waveguide analysis.