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S21 ripple problem after calibration

Question asked by dave_11 on Jun 19, 2014
Latest reply on Jul 3, 2014 by sonia1234
We cannot eliminate +/- 0.05dB S21 ripple from our calibration and smoothing is not an option.  
Our setup is 8.5 to 11.5GHz, IFBW at 1kHz.  We performed an adapter removal calibration with an 85052D (3.5mm) calibration kit on an N5230C network analyzer.

When I examine the transmission tracking trace, it looks quite a bit like the ripple I see on S21, just different magnitude.

We want to measure devices that have a 20dB RL and 0.25dB IL.  What am I doing wrong?