rfidea
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I tested this in Analog Artist, IC6.1. When I tried to plot S11 I only managed to plot different versions of S11 (mag, phase, dB, real, Smith ...). I do not think you can plot the input impedance of the DUT directly from the sp analysis. I guess my question is how have you plotted the impedance?
Of course you can do some math of the S11 data to get that, but in that case it seems easier to do an AC analysis and measure input voltage and current and take it from there.
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