Axisymmetric Cavity Resonator
Model 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.