Most likely the simulation time is too small. Please use 100 times what you used. Do not worry about the estimated time as it will terminate after fulfilling the autoshutoff min and will stop early. If it stops at 100% it means the simulation time is too small.
You can place a time monitor at the same location and check if the time signal completely decays.
BTW: usually you do not need to use single frequency, as the source is a pulse in most of the times. The frequency domain result is obtained from the Fourier transform of time signal. If you have questions regarding to this please write a new post.
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