'sparameters' function showing error to read S-parameter data from touchstone file

I am trying to read S-parameter data from touchstone file using the following option:

sobj = sparameters(filename)

But getting the following errors

"Error using rf.file.touchstone.Data/read

Data is inconsistent with the Touchstone format.

Error in rf.file.touchstone.Data

Error in rf.internal.netparams.AllParameters/readRFFile

Error in rf.internal.netparams.AllParameters

Error in rf.internal.netparams.ScatteringParameters

Error in sparameters (line 80)

obj = [e-mail](varargin{:});"

The touchstone file is in DB/angle format

! ...

# GHz S DB R 50

!

Is that an issue or the problem is somewhre else?

Note that I can read the touchstone file without any issue in other commercial software.

[Vu Hoang Thang Chau]

Hi Muhammad,

I have the same problem trying to import my .s2p files from Minicircuit.

@MathWorks Support Team Is there any explanation?

S= sparameters('AVA-183A+_5.25V_Plus25degC.s2p');

The error that I got

Error using ibisTschk2

Invalid character '�'.

Error in rf.file.touchstone.Data

Error in rf.internal.netparams.AllParameters/readRFFile

Error in rf.internal.netparams.AllParameters

Error in rf.internal.netparams.ScatteringParameters

Error in sparameters (line 91)

obj = [e-mail](varargin{:});

Regards,

Vu.

[Shawn Hineline]

Hi All,

I have the same issue importing Minicircuits .s2p files. The import worked with a previous version of Matlab. With the current version of matlab (R2024a, Update 2) I had to remove the degrees symbol from the file for the import to work.

For example:

!TEST CONDITIONS: Z:50 OHM SYSTEM, INPUT POWER = 0dBm, TEMP:25C

reads in correctly,

!TEST CONDITIONS: Z:50 OHM SYSTEM, INPUT POWER = 0dBm, TEMP:25°C

gives an error.

Note the whole line is commented out so matlab should ignore everything in the line and not give a read error

Thanks,

Shawn

Answer 1

[Mark]

Unfortunately, the official Touchstone 2.0 reader pays attention to non-US-ascii characters even if they are in comments.

>> setTouchstoneReader('IgnoreComments',false) % to enable reading "bad" files

>> setTouchstoneReader('ParseComments',false) % to go back to strict behavior

This uses MATLAB settings, so please be careful to include the "false" so that your setting isn't persistent.

The documentation for setTouchstoneReader is at setTouchstoneReader.

Best,

Mark

[Walter Roberson]

?? Wouldn't it be

setTouchstoneReader('IgnoreComments',true) 

or

setTouchstoneReader('ParseComments',false)

to read "bad" files, and

setTouchstoneReader('IgnoreComments',false) 

or

setTouchstoneReader('ParseComments',true)

to go back to strict mode???

[Mark]

The second argument specifies whether the setting is persistent or not.

As I said, it's confusing because it uses settings.

[Walter Roberson]

Weird !

[Mark]

I agree with you.

I'm not a fan of the settings solution. It's not name-value pairs.