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Incorrect result of de-embedding

Question asked by serrurier53 on May 22, 2015
Latest reply on May 23, 2015 by Dr_joel
On a PNA N5225A, I obtain inconsistent result when using the de-embedding procedure "Response/Cal/Fixtures/2 port De-embedding".

I have a WR187 waveguide which I load with two sections of different dielectrics (epsilon 1 and epsilon 2). I do three measurements (dielectric 1 alone, dielectric 2 alone and dielectric 1 and 2 cacaded). I wanted to retrieve the S parameter of dielectric 2  by deembedding the dielectric 1 S parameter form the cascaded S parameter. This does not work (the deembedded S parameter are very different from those measured on diectric 2 only). I obtain a correct result when I perform the demebedding with a mathematical software.

Are thre known bugs with such deembedding procedure on the PNA ?

Thank you in advance for your help