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## Main Question or Discussion Point

Hello,

I have written 3D FDTD code with Mur ABC which gives correct results for time domain data.

Now I want to compute the resonance frequency of a rectangular cavity using this 3D FDTD code.

I donot know how I will do that.

Would someone please advise me the steps I need to follow now to calculate the rectangular cavity resonance frequency.

Any code or help on how the time domain data need to be processed is highly appreciated. Thank you.

I have written 3D FDTD code with Mur ABC which gives correct results for time domain data.

Now I want to compute the resonance frequency of a rectangular cavity using this 3D FDTD code.

I donot know how I will do that.

Would someone please advise me the steps I need to follow now to calculate the rectangular cavity resonance frequency.

Any code or help on how the time domain data need to be processed is highly appreciated. Thank you.