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S-parameters phased array

Hi,

I have a 4by4 symmetrical phased array, but something strange is happening with my S-parameters. Because my array is symmetrical, the following should approximately be the same: S11=S1616, S21 = S1516 etc.

However, when I look in my .s16p file, S1516 is -180 degrees shifted in phase with respect to S21. What causes this shift? Thanks in advance!

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Altair Forum User

Hello @Meerten

We double checked your results, both in the .bof file and the .s16p file that you exported, but were unable to reproduce the problem that you described. In our case the phase of S21 and S1516 was almost identical. Can you please double check on your side, or attaching a screenshot?

Altair Forum User

I found the problem! Somehow, one port was in reverse polarization which caused the 180 degrees phase shift. Thanks for your help @Peter Futter