How to build bigger S-parameter from smaller S-parameters

I have cable S4P measurements for :

1. Through channel (S4P file)
2. few - NEXT channels of the through channel in section 1 (Near end cross talk) S4P files
3. few FEXT channels if the same through channel in section 1 (FAR end cross talk) S4P files

I need from these to build S16P file, with all this data.

How can I perform this task (that seems to be just placing Matrix data in the correct bigger matrix)

Example of files to use are attached

Thanks,

Roee

Answer 1

[Abhimenyu]

Hi Roee,

I understand that you want to build a S16P file from the provided S4P files. Using MATLAB, you can deconstruct a bigger S-parameter file into smaller ones, e.g., S4P to S2P, but vice versa can only be done by manual array concatenation. Here is the example code for the same:

% Load the S4P file for the through channel 
through_channel_data = read(rfdata.data,'THRU_Molex_TP1-TP4_2mQSFP-DD_RowA_07-2019_P1Tx4-P2Rx4.s4p');  

% Load the S4P files for the NEXT channels 
next_channel1_data = read(rfdata.data,'NEXT_Molex_TP1-TP4_2mQSFP-DD_RowA_07-2019_P1Tx4-P1Rx8.s4p'); 
next_channel2_data = read(rfdata.data,'NEXT_Molex_TP1-TP4_2mQSFP-DD_RowA_07-2019_P1Tx4-P1Rx7.s4p'); 
% ... (load other NEXT channel data files as needed) 

% Load the S4P files for the FEXT channels 
fext_channel1_data = read(rfdata.data,'FEXT_Molex_TP1-TP4_2mQSFP-DD_RowA_07-2019_P1Tx4-P2Rx5.s4p'); 
fext_channel2_data = read(rfdata.data,'FEXT_Molex_TP1-TP4_2mQSFP-DD_RowA_07-2019_P1Tx4-P2Rx3.s4p'); 
% ... (load other FEXT channel data files as needed) 

% Initialize an empty S16P matrix 
s16p_matrix = zeros(4, 4, length(through_channel_data.Freq)); 

% Place the data from the through channel S4P file into the S16P matrix 
s16p_matrix(1:4, 1:4, :, :) = through_channel_data.S_Parameters; 

% Place the data from the NEXT channels S4P files into the S16P matrix
s16p_matrix(1:4, 2:5, :, :) = next_channel1_data.S_Parameters; 
s16p_matrix(1:4, 3:6, :, :) = next_channel2_data.S_Parameters; 
%s16p_matrix(1:4, 4:7, :, :) = next_channel3_data.S_Parameters; 
% ... (place other NEXT channel data into the S16P matrix as needed) 

% Place the data from the FEXT channels S4P files into the S16P matrix 
s16p_matrix(1:4, 9:12, :, :) = fext_channel1_data.S_Parameters; 
s16p_matrix(1:4, 10:13, :, :) = fext_channel2_data.S_Parameters; 
%s16p_matrix(1:4, 11:14, :, :) = fext_channel3_data.S_Parameters; 
%s16p_matrix(1:4, 12:15, :, :) = fext_channel4_data.S_Parameters; 
% ... (place other FEXT channel data into the S16P matrix as needed) 

% Save the S16P matrix as an S16P file 
save('output.s16p', 's16p_matrix'); 

You can substitute rest of your files accordingly and construct the S16P file. For more information follow the below links:

• Process file data for analysis-https://www.mathworks.com/help/releases/R2023a/rf/ug/process-file-data-for-analysis.html
• Rfdata.data-https://www.mathworks.com/help/releases/R2023a/rf/ref/rfckt.rfdata.data.html

Thank you,

Abhimenyu.