Actually, I am using ANSYS maxwell, but I think the principle should be the same. The operating frequency is 500kHz~1MHz, and the ground plane is about 35 um in thickness. Is that frequency high enough for the ground plane to block the magnetic field? Besides, there is only voltage requirement on the ground plane, but no specific magnetic boundary condition. In this case, shall I only set a metal plane with zero electric potential in the maxwell simulation?