Convert S-Parameters zu Z

Hello everybody,

I tried to read the S parameters from a circuit with the source code below and to convert them to Z parameters. Unfortunately, I get the following error message:

• Error using CheckNetworkData (line 39)S_PARAMS must be numeric.

Can someone help me there?

Thanks in advance.

Sven

%Schaltkreis anlegen

freq = linspace(40e3,9e9,100000);

ckt_DUT = circuit('LC_Wire');

add(ckt_DUT,[1 2],inductor(1.25e-9))
add(ckt_DUT,[2 3],capacitor(1e-12))
add(ckt_DUT,[2 4],inductor(1.25e-9))
setports(ckt_DUT,[1 3],[4 3]);

%C_Open (siehe Script Seite 19) anlegen

ckt_C_open = circuit('Copen');

add(ckt_C_open,[1 3],capacitor(100e-15));
add(ckt_C_open,[1 2],resistor(1e9));
add(ckt_C_open,[2 3],capacitor(100e-15));
setports(ckt_C_open,[1 3],[2 3]);

%L_Short (siehe Script Seite 19) anlegen

ckt_L_short = circuit('Lshort');

add(ckt_L_short,[1 2],inductor(1e-9));
add(ckt_L_short,[2 3],inductor(1e-9));
add(ckt_L_short,[4 5],resistor(1e-15));
setports(ckt_L_short,[1 4],[3 5]);

%S-Parameter von DUT_Messung berechnen und zu Z umwandeln
S_ckt_DUT = sparameters(ckt_DUT,freq);
Z_ckt_DUT = s2z(S_ckt_DUT);

Answer 1

[Kiran Felix Robert]

Hi Seven ,

You are getting an error because you are passing a struct variable into the s2z() function. (Try to insert a breakpoint and see the command window for the data type.)

You must pass only the s-parameter values, which is available in the Parameters field of your S_ckt_DUT struct.

Z_ckt_DUT = s2z(S_ckt_DUT.Parameters) % Replace the last line with this

[Sven Brasa]

Thank you! :-)