Patent ID: 11879921
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. The load pull tuner system as in claim 1,
wherein the calibration method for the coaxial load pull tuner comprises the following steps:
a) connect the coaxial load pull tuner to a pre-calibrated vector network analyzer;
b) rotate out (withdraw) the RF energy-absorbing device out of the cavity of the slabline, defining a rotation angle Φo=0;
c) move the reflective tuning probe close to the test port, defining a horizontal position Xo=0;
d) measure s-parameters of the coaxial load pull tuner and save in an init matrix [S0];
e) in a first tuner control-s-parameter measurement loop
rotate the RF energy-absorbing device to a multitude M of rotation angles Φm between a value Φmin, corresponding to withdrawal, and a value Φmax corresponding to closest proximity to the center conductor,
measure s-parameters of the coaxial load pull tuner and save;

f) rotate the RF energy-absorbing device back to the angle Φo=0;
g) in a second tuner control-s-parameter measurement loop
set the reflective tuning probe to a multitude N of horizontal positions Xn along the slabline, between positions Xo and Xo+λ/2,
measure s-parameters of the coaxial load pull tuner and save;

h) cascade the invers init matrix [S0]−1 with the N s-parameters of step g) and save;
i) cascade the M×N permutations of s-parameters of steps e) and h) and save in a tuner calibration file comprising M×N tuner s-parameters Sij (Φm, Xn) for {i,j}={1,2}.