Hi Elgabo,
I think you have a principal problem: the SAR value is defined
as a 3d value! In 2d it does not make any sense, because you
have the mass=0 (no z-component)!!
For SAR calculation with a feed point exitation you have to use always
a 3d simulation program.
Maybe in some special cases with plane waves it is enough if you
simulate only one x-y-plane, because maybe in the z direction the field
distribution is the same over all the planes depending on your problem.
best: ricy