Hopefully I can word this correctly. Consider viewing S11 of a short on a smith chart. It starts at the left and moves clockwise around the edge. If you then add a small length of line between the reference plane and the short, the phase angle wraps further around the outside in the clockwise direction. Question: Why does the phase angle of S11 get smaller with more physical length added to the line? I'm aware of the formulas to predict this, but what is the "physical" explanation?