Is it right for using cang_deg(S(2,1)) to calculate two ports phase diff in Ansys?

[tony_lth]

Hi, gurus,
I designed a power split from port1 to port2 and port3.
Now I want to calculate their phase difference in deg in Ansys.
So I using this function: cang_deg(S(2,1))-cang_deg(S(3,1)).
I hope the diff should be zero.
But I found someone said that this calculation is not precise. They said should include S11.
I am confused.
Hope you can help.
Best,
Tony Liu

 

[vfone]

I think your equation is fine. I don't see the reason using S11..

Here is a similar example, and you see that S11 is not used in phase difference plots:

http://edge.rit.edu/edge/P09343/public/Simulation/Simulation%20Results%2090deg

 

[yiyi]

This can cause cross-cycle issues, and you have to make sure it's the same cycle first，This is critical