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Axisymmetric Cavity Resonator

Application ID: 14517

This is a benchmark model for the 2D axisymmetric formulation of the Electromagnetic Waves, Frequency Domain interface that is available with the RF Module. The problem is to find the resonant frequencies and fields inside an axisymmetric cavity with rectangular cross-section and perfectly conducting walls. Analytical expressions for the eigenvalues can be obtained using separation of variables. The eigenvalues obtained with COMSOL are in excellent agreement with the analytical values.

The model also contains instructions for plotting the Cartesian components of the electric field in 3D with the correct dependence on the angular coordinate. The plots are animated to illustrate that the modes are travelling waves with right-handed and left-handed circular polarization.

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.