Dear yzriver:
Your results may vary depending on the type of ground plane you are using. If you use a metal ground plane (with finite loss), there are several simulators to give you such a good result.
If you are using a high conductivity substrate (like heavily doped silicon) you should take care in how you simulate this. Not all field solvers do a really good job of this. I think that that Sonnet Lite that rautio talks about could do this, but you have to make sure to make the substrate big enough so that the simulation box walls don't make an alternative return current path. If you use a 3D field solver to do this, make sure you use a high enough mesh density to resolve the conduction current in the substrate accurately.
--Max