Hi,
It is recommended to use the Eigenmode solver for finding the resonance frequencies of a structure and the fields at those frequencies. Eigenmodes are the resonances of the structure. With Eigenmode solver you will be able to calculate all of the resonance frequencies, as well as the Q factor of each frequency.
You can find more technical information on calculating resonant frequencies on HFSS Help under,
HFSS Help> HFSS Technical Notes> The HFSS Solution Process> Calculating the Resonant Frequency
and
HFSS Help> HFSS Technical Notes> The HFSS Solution Process>Q Factor of Resonant Cavities
You can find more information on adding an Eigenmode Solution Setup in, Ansys HFSS 2023 R1 - Adding an Eigenmode Solution Setup
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