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passive filter >0 dB with 8364C pna

Question asked by fcolleon on May 11, 2009
Latest reply on May 19, 2009 by daveb
Hi all. I'm using a 8364C pna, and i  made a calibration with a custom waveguide kit (which is ok afaik). Measuring a passive filter(30Ghz-50Ghz), i get a zone (31-34 Ghz), where the s21 and s12 are > 0 dB. All other measurements seems to be ok(also another measurements with the same waveguide kit). Is this a problem calibration? If so, how can i correct it? (other options besides to buy the agilent waveguide calibration kit   ).

If it could be another thing besides calibration, some help would be very apreciated.