Patent ID: 11867736
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G

Claim 4:
5. A calibration method for the automated load pull tuner of claim 1 comprising the following steps:
a) connect the automated load pull tuner to a vector network analyzer, calibrated at a frequency F;
b) initialize both tuning probes by moving them to positions X1=X2=X0 along the waveguide transmission line relative to the input port;
c) measure s-parameters of the automated load pull tuner and save in a zero matrix [S0];
d) in a movement-measurement loop:
move the tuning probe P #1 to a multitude M>1 of positions X1,
whereby X0≤X1≤X0+λ(F)/2,
measure s-parameters Sij(X1), whereby {i,j}={1,2},
save (X1,Sij(X1)) in a data file S1;

e) move the probe P #1 to the position X1=X0;
f) in a movement-measurement loop:
move the tuning probe P #2 to a multitude N>1 of positions X2,
whereby X0≤X2≤X0+λ(F)/2,
measure s-parameters Sij(X2), whereby {i,j}={1,2},
save (X2,Sij(X2)) in a data file S2;

g) retrieve data (X1,Sij(X1)) from the data file S1 and (X2,Sij(X2)) from the data file S2;
h) in a scanning loop through the data (X1,Sij(X1)) for the multitude M of positions X1:
for each position X1 execute a nested scanning loop through the data (X2,Sij(X2)) for the multitude N of positions X2, and:
if (X1≤X2) then
h1) cascade (convert s-parameters to transfer parameters, multiply and convert back to s-parameters) the invers zero matrix [S0]−1 with the s-parameters Sij(X2) of the data file S2 and replace in the data file S2;

else if (X1>X2) then
h2) cascade the invers s-parameter zero matrix [S0]−1 with the s-parameters Sij(X1) of the data file S1 and replace in the data file S1;

i) retrieve the s-parameters Sij(X1) from the data file S1 and Sij(X2) from the data file S2, and:
if (X1≤X2) then
cascade the s-parameters of the file S1 with the s-parameters of the data file S2 to create Sij(X1,X2),

else if (X1>X2) then
cascade the s-parameters of the data file S2 with the s-parameters of the data file S1 to create Sij(X1,X2), and

j) save calibration data points in a format (X1, X2, Sij(X1,X2)) in a data file TUNER-CAL(F) for later use.