Hey Zied,
I understand that you are trying to import a 1-port Touchstone file in MATLAB Online.
It appears that you have enabled all necessary toolboxes and used the correct syntax. The issue likely lies with the filename you have passed to sparameters function. The filename parameter for sparameters command is a character vector and thus, case sensitive. Also, filename should be the name of a file in the current folder or the full path to a file. I was getting the same errors when either the filename was incorrect, or the full path wasn’t passed. Otherwise, the following command works given RF toolbox is enabled.
S = sparameters('default.s1p');
Hope this helps.
