ElectromagneticWorks' High Frequency Suite - HFWorks S-Parameters
HFWorks S-Parameters Analysis
Do you need to know what the input impedance of your structure is? How is its return loss over frequency? Is the insertion loss acceptable? Are you concerned about coupling / isolation in your design? Do you want to make sure that you do not have mode conversion in your structure? What about cross-talk and signal integrity?
HFWorks' S-Parameters solver can help you with these applications and a whole lot more!