5227A上的未知校准有什么限制

所有，我正在尝试使用SMA连接器在PNA N5227A上进行未知的校准。
我想知道这个校准有什么限制。
我有一个未知的通过，没有那么好的匹配（谢谢你，



以下为原文

All,
I am attemp ting an unknown thru calibration on a PNA N5227A with SMA connectors. I am wondering what the limitations are on this calibration. I have a unknown thru that has not-so good match (<- 10dB) from 10 MHz to 16 GHz. My loss is about 23 dB at 16 GHz. Whenever i do the calibration, i get an unrealistic post-calibration measurement (i.e. S11 < -30 dB) and S21 essentially open (-40dB) across this particular frequency range. I am wondering if i have to use a better matched thru and/or less lossy thru. The documentation stipulates that as long as you dont have 40 dB loss including the cables this method should work. I am dumbfounded as to what could be going on. I can post some of the plots if this helps answer the question.
thank You,