rectangular waveguide probe

Hi Guys,
Is there anybody out there having some experience how to simulate in HFSS a rectangular waveguide to microstrip/CPW transition??

I tried to simulated a probe already widely published, but I am having some problems how to set up my model......

plz reply

regards

Added after 13 minutes:

One of my problems is how to plot the probe's impedance when I dembeed the port until the probe feed point.

Any help?