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S21 Phase Abnormal

Question asked by sn_lee on Nov 17, 2014
Latest reply on Nov 24, 2014 by Dr_joel
I am new to phase measurement. Last week, after perform a full-2 port cal with E5071C, without disconnecting the cables and adapter (same connection as THRU calibration), I check out the phase of S21. I was expected to see a sawtooth wave as the phase but instead I get a rectangular wave as attached (E5071C_S21Phase.bitmap). I thought there might be something wrong with my calibration or cables, so I checked out S21 Log Mag, and found that trace is smooth and normal as attached (E5071C_S21LogMag.bitmap).

Anybody can help me to explain the weird phase trace?
Thank you!


Edited by: sn_lee on Nov 20, 2014 10:26 PM