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[Solution]

It is possible to reduce the number of ports of the component without re-solving HFSS design. One of the workflow is to dynamically link HFSS model to the circuit design by performing the steps: -Open a new circuit design in the same project as solved HFSS design; -dynamically link HFSS model to the circuit design by dragging the HFSS design icon and dropping it into the Circuit design in the Project Manager window (Fig.1); – In the circuit design, connect pins that should be left in the component to the ports (Fig.2); -define the default behavior for unconnected pins for the component (linked HFSS design here). Perform the following steps (Fig.3): -Right click on the component, choose Edit Component. In the window, choose Terminal tab. -Select the unused pins, change “Unconnected/default behavior” to Grounded -Set “R to ground” to a desired value, for example 50 -Click “Apply to selection” button -Nothing will change in the schematic, but the change will be visible in netlist (Fig.4). -Define Linear Network Analysis in the circuit design using the same frequency points as in HFSS frequency sweep, run the analysis. -After analysis is completed, right click on Linear Frequency line in Project Manager and choose “Export Solution”; -In the pop up window, the S-matrix size is 2×2, proceed and export matrix data as usual.

Attachments:
1. how%20to%20export%20touchstone%20file%20with%20reduced%20number%20of%20ports.pdf