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Lossy Circular Waveguide

Application ID: 1418

In mode analysis it is usually the primary goal to find a propagation constant. This quantity is often, but not always, real valued; if the analysis involves some lossy part, such as a nonzero conductivity or an open boundary, the eigenvalue is complex. In such situations, the real and imaginary parts have separate interpretations:

  • The real part is the propagation constant
  • The imaginary part is the attenuation constant, measuring the damping in space

This tutorial shows how to set up a mode analysis with lossy metallic walls for a waveguide. The attenuation in dB per km is extracted for several modes.

This model is included as an example in the following products:

RF Module

The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.