Polynomial equation from the S matrix

[Nia11]

Hello friends, I have to get the polynomial equation from the S matrix, for example I have measured the S parameters of the SMA connector using the VNA for the frequency range 300KHz to 4GHz. I have to determine the loss of the connector and get the polynomial equation for the each S parameters such as S11,S12,S21 and S22. How can I get it with this information, could anyone please help me?.
The below figure is the S2P file obtained from the VNA

 

[nomigoraya]

Loss of connector can be determined directly from Insertion loss information in S12 or S21 but that will be at particular frequency since you have a range of frequency so you will get a trend in loss by observing insertion loss.
To find the polynomial you can use Matlab or even EXCEL that is very easy

 

[Nia11]

could you please tell me how can we find the polynomials with the matlab?. because I have the S2P file, when I tried the poly command it doesn't work out for me.

 

[nomigoraya]

Try to import it in Excel and then plot the trend it will fit the polynomial of the order of your choice.
I am currently not using Matlab so do not know much about it
Try with Excel if it does not work we will see how to work around this problem