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Power Losses and Attenuation in Waveguides

In earlier discussions, we assumed a lossless waveguide Description: 28625.png for which the attenuation constant was Description: 21407.png and the propagation constant was Description: 28855.png. However, in general, the guide walls are not perfectly conducting and the dielectric is lossy Description: 22559.png 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:
  1. Dielectric losses in the medium filling the space between the conductors in which the fields propagate
  2. Ohmic losses or conduction losses due to conducting walls

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