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After reading about SNA and VNA doesn’t the SA44 with a directional coupler qualify as a 2 port VNA?
The SA44B / TG44A with coupler can be used to measure magnitude S11 and magnitude S21. It cannot provide the phase of S11 or S21. This is the critical difference between a VNA and SNA.
A two port VNA can also provide S22 and S12 without swapping your device around.
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