Vipul, In reality the termination is not going to be purely resistive at all frequencies, so being able to enter the resistive and reactive part can be important to better capture the termination. Equally, it's impossible to have a constant complex impedance at all frequencies, so this capability allows you to capture the fact that this impedance will be different at different harmonics of the fundamental. Because this is a frequency domain analysis, we don't have to necessarily have a representation that will be causal in the time domain (which you do for transient analysis) which allows this kind of frequency-domain modelling of the port impedance. Kind Regards, Andrew.
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