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HP8753C passive device measurement. S21 != S12

Question asked by CYBERPHOX on Mar 2, 2010
Latest reply on Mar 2, 2010 by Dr_joel
Hi All

I am having a problem with a SAW filter measurement where I get S21 and S12 not being equal. For S21 I get -1.45dB and S12 -1.4dB. When I look at the result over frequency there is a consistent offset. After calibration i do see that S21 is around 0.004dB and S12 is -0.004dB (something like that) again a constant offset.

My analyser has recently come back from calibration at Agilent. So either I have my cables not connected well or something else is wrong.

Has this happened to anyone and what did you have to do to fix it?

Many thanks