Guilin Sun
Ansys Employee

The graph you showed is a polar plot of the directivity, and there is a radiation-type directivity. As you can see from the analysis group, it calculates the top and bottom semi-sheres so you can have abox monitor analysis group and do the same thing even it is a Gaussian illumination.

Since the frequency monitor records data for the given wavelengths, you can specify which wavelength you want the monitor to record data.