Guilin Sun
Ansys Employee

Convergence teating can be very challenge as there are several factors.

I would suggest that you do not change the override size; make sure the dipole is located at the same Yee mesh location each time correspondent to its polarization; and make sure you have thick enough PML. You can roughly measure PML thickness with the ruler on the left hand side, the tool bar. PML should be half or motr wavelength  thick as dipole radiation in 4pi space.