touchstone file could not be processed in matlab

i tried to import the s4p file into matlab as shown in the code bellow, i get the following error.

Where did i go wrong?

Thanks.

obj = SParameterChannel('FileName','RDL1_PCB.s4p',...
'PortOrder', [1 2 3 4],
...
    'MaxNumberOfPoles', 1000,...
    'ErrorTolerance', -40,...
    'SampleInterval', 6.25e-12,...
    'StopTime', 100e-09,...
    'TxAmplitude', 1.0,...
    'TxRiseTime', 40e-12,...
    'TxRTFactor', 0.6);
plotRational(obj)
Unable to resolve the name 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{:});

Error in SParameterChannel/validateSparameter (line 459)
            sobj = sparameters(obj.FileName);

Error in SParameterChannel/calculateImpulse (line 488)
            validateSparameter(obj)

Error in SParameterChannel/get.f (line 402)
                calculateImpulse(obj);

Error in SParameterChannel/plotRational (line 428)
            freqsforresp = linspace(0,max(obj.f)*2,length(obj.f))';

Answer 1

[Cris LaPierre]

It took some digging, but the error is likely because you do not have the RF Toolbox installed. From the documentation page for SParameterChannel:

The SParameterChannel object combines the scattering parameter (S-parameter) model of a baseband communication channel with an analog transmitter and receiver into a single S-parameter with adjustable port ordering. The object then calculates the impulse response of the S-Parameter using the rational (RF Toolbox) function. The SParameterChannel object supports .sNp Touchstone files, where N is an even number representing the number of ports. The value of N is 4 or higher.

I was getting the same error as you until I added it. If RF Toolbox is included in your license, you can use the Add-Ons Explorer.

I will send a request internally for improving the error messaging in this scenario.

[KAI LI]

WOW , it's work! Thanks a lot!