Hi BSimono,
As per my understanding, you would like to add 4 lossless transmission lines to each port of an imported 4-port 'S-parameters'.
I would suggest you load the 4-port S-parameters using the 'sparameters' function and define the characteristics of the lossless transmission lines such as 'line_length' and 'line_z0' that you would want to add to each port.
You could use 'rfkct.txline' object to create the transmission line models and you could iterate over each port of the 'S-parameters' to add the transmission models by creating an empty cascade object using the 'rfckt.cascade' function.
You could save the modified S-parameters to a new Touchstone file using the 'write' function.
The following code may help you achieve this:
% Load the original S-parameters file
% original_sparams = sparameters('filename');
% Define the transmission line parameters
line_length = 0.1; % Length of the transmission line (in meters)
line_Z0 = 50; % Characteristic impedance of the transmission line (in Ohms)
% Create the transmission line model
transmission_line = rfckt.txline('LineLength', line_length, 'Z0', line_Z0);
% Create an empty cascade object
modified_sparams = rfckt.cascade;
% Add the transmission line to each port of the cascade using a 'for' loop
% for port = 1:4
% modified_sparams.Elements{end+1} = transmission_line;
% end
% Connect the original S-parameters to the cascade
% modified_sparams.Elements{end+1} = original_sparams;
% Save the modified S-parameters to a new Touchstone file using 'write'
Kindly refer to the following documentation links to have more information on:
- 'rfckt.txline' object: https://www.mathworks.com/help/rf/ref/rfckt.rfckt.txline.html
- 'rfckt.cascade' object: https://www.mathworks.com/help/rf/ref/rfckt.rfckt.cascade.html
- 'sparameters' function: https://www.mathworks.com/help/rf/ref/sparameters.html
Hope that helps !
Balavignesh
