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

Claim 7:
8. The load pull tuner system as in claim 1,
wherein the calibration method for the coaxial load pull tuner comprises the following steps:
a) calibrate the VNA between terminations A and B of RF cables connected to associated ports of the VNA and save in VNA calibration file CAL-AB;
b) insert the load pull tuner between the RF cable terminations A and B, wherein cable termination A connects with the test port of the tuner and cable termination B connects with the idle port of the tuner;
c) rotate the RF energy-absorbing device out of the cavity of the slabline, (withdraw);
d) move the reflective tuning probe close to the test port, defining a horizontal position Xo;
e) break the connection between the idle port of the tuner and the RF cable termination B;
f) calibrate the VNA between the idle port of the tuner and the RF cable termination B and save in VNA calibration file CAL-CB;
g) reconnect the idle port of the tuner with the RF cable termination B;
h) in a first tuner control-s-parameter measurement loop
set the reflective tuning probe to a multitude N of horizontal positions Xn,
between Xo and Xo+λ/2,
measure s-parameters of the coaxial load pull tuner and save;

i) return the reflective tuning probe to the horizontal position Xo;
j) in a second tuner control-s-parameter measurement loop, load VNA calibration file CAL-AB into the VNA;
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;

k) cascade all M×N permutations of s-parameters saved in steps h) and j) and save in a tuner calibration file comprising M×N tuner s-parameters Sij (Φm, Xn) for {i,j}={1,2}.