Power Losses and Attenuation in WaveguidesIn earlier discussions, we assumed a lossless waveguide for which the attenuation constant was and the propagation constant was . However, in general, the guide walls are not perfectly conducting and the dielectric is lossy and there is a continuous loss of power as a wave propagates through the waveguide.
Consequently, for waveguides with conducting walls, the power (transmission) losses are primarily due to the following two causes:
- Dielectric losses in the medium filling the space between the conductors in which the fields propagate
- Ohmic losses or conduction losses due to conducting walls