how to convert z parameter to s parameter?

Hi,

I have two set of data.

One data has frequency, Z(ohm), theta.(R1Z.csv)

other data set has frequency, Z(db), theta (R1.txt)

I need to convert this two set of data from Z paramters to S parameter.

Could any one please help me to resolve the issue?

Answer 1

[Bora Eryilmaz]

Depending on which way you want to go:

% Ohm to dB
Z = 4.17;
ZdB = 20 * log10(Z)

ZdB = 12.4027

% dB to ohm
ZdB = 12.39;
Z = 10^(ZdB / 20)

Z = 4.1639

I am not sure what you mean by S parameter, though.

[Venkatkumar M]

r= readmatrix('R3.txt','Delimiter',["\t",","],'TrimNonNumeric',true);
z1=r(:,2);
z2=r(:,3);
z=[z1 z2];
s_params=z2s(z,50);

Error using CheckNetworkData

Z_PARAMS must be a complex N-by-N-by-M array.

Error in z2s (line 17)

[m, z_params] = CheckNetworkData(z_params, 'N', 'Z_PARAMS');

Error in untitled5 (line 5)

s_params=z2s(z,50);

How to obatin S parameter from Z paramters?

[Bora Eryilmaz]

The error "Z_PARAMS must be a complex N-by-N-by-M array." indicates that your variable z is not in the correct format. Is your z matrix a square matrix?

z = rand(3,3) + rand(3,3)*1i

z = 
   0.6536 + 0.5414i   0.9249 + 0.3064i   0.0514 + 0.9900i
   0.4516 + 0.4830i   0.1859 + 0.3020i   0.1368 + 0.0369i
   0.1193 + 0.5870i   0.8127 + 0.6790i   0.3449 + 0.4838i

z2s(z,5)

ans = 
  -0.7531 + 0.1247i   0.3522 + 0.0036i   0.0595 + 0.3156i
   0.1718 + 0.1383i  -0.9614 + 0.0743i   0.0721 - 0.0281i
   0.0571 + 0.1417i   0.3157 + 0.1705i  -0.8388 + 0.1480i

[Venkatkumar M]

Okay is there a way to convert available data to to complex form?

[Bora Eryilmaz]

Looks like to have magnitudes and angles as your data:

(1.23903195326879e+001dB,-8.89777753697489e+001°)

I think the right transformation to a complex format would be the (r,theta) to (x,y) transformation:

ZdB = 1.23903195326879e+001; % In dB
Z = 10^(ZdB / 20)

Z = 4.1641

thetaDeg = -8.89777753697489e+001; % In degrees
thetaRad = thetaDeg * pi / 180 % In radians

thetaRad = -1.5530

z = Z * (cos(thetaRad) + 1i*sin(thetaRad))

z = 0.0743 - 4.1634i

s = z2s(z, 1)

s = 0.8838 - 0.4504i

I don't know much about z2s transformations, so please double check if the last line gives you what you want.