RFICDUDE wrote on Aug 30th, 2011, 5:25pm:1. Yes, the reflection coefficient at the port is considered in the simulation and results.
2. I am not 100% sure of your question. The PORT element is just a source with a defined source impedance. It is the various analysis types that produce results that can be made to correspond to equivalent results measured on test equipment. Large signal analysis like transient, PSS, envelope transient, harmonic balance, etc. are all capable of generating frequency domain spectrum results. The PORT element works with any of the large signal analysis, but you have to define the type of excitation being used (sine, pulse, piece-wise, sample points from a file).
Thank RFICDUDE's reply
In question 2, I mean when the port is used as a load, and set as DC=0, it seems the circuit simulator trade this port as a simple resistor. I am not sure, a simple resistor can represent the real situation?