This narrowband RF filter (1% FBW) has to operate under an increased ambient temperature of 60°C. The structure is predominantly Aluminium, which is cheap and easy for machining but not good for dealing with thermal expansion.
In CST Studio Suite 2026, it is now possible to run the EM simulation with a deformed mesh, caused either by thermal conditions or a high power input signal. This allows for an accurate calculation of the detuned filter response.
The great thing is that everything is done within CST, which means you can use the parametric model and quickly configure derived simulation projects with the appropriate physical conditions (thermal / structural / EM). This allows you to seamlessly switch between materials or do parametric studies.
