Patent ID: 11879920
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. The RF load-pull tuner of claim 1
being calibrated as follows:
a) connect the tuner to a vector network analyzer VNA pre-calibrated at an RF frequency F greater or equal to Fmin;
b) withdraw the RF energy-absorbing sliver from the airline to an initial setting A0 and place the toroid tuning probes to initial positions X10 and X20, wherein X10 is equal to the furthest extension A of the RF energy-absorbing sliver away from the test port and X20 is equal to X10 plus one half of a wavelength λ(F)/2 at a frequency of operation;
c) measure s-parameters Sij for {i, j}={1,2} of the load pull tuner and save in a zero matrix [S0];
d) in an RF energy-absorbing sliver positioning and measurement loop,
insert the RF energy-absorbing sliver in a multitude of P+1 steps Ak from withdrawal setting A0 to maximum insertion setting AP, where P>0 and 0≤k≤P) measure s-parameters Sij for {i, j}={1,2} of the tuner and save in a file comprising s-parameter matrices [SA]=[S(Ak, X10, X20)] a function of RF energy-absorbing sliver penetration Ak between settings A0 and AP with both toroid tuning probes initialized;
e) withdraw the RF energy-absorbing sliver to the withdrawal setting A0;
f) in a toroid tuning probe #1 positioning measurement loop,
move toroid tuning probe #1 in a multitude of M+1 steps X1i from the position X10 to a position X1MAX equal to X10 plus one half of a wavelength λ/2(F), where M>1 and 0≤i≤M, measure s-parameters of the tuner and save in a file comprising matrices [S1]=[S(A0, X1i, X20)], a s-parameter function of X1 at the withdrawal setting A0 of the RF energy-absorbing sliver and the initial setting X20 of the toroid tuning probe #2;
g) move the toroid tuning probe #1 to the initial position X10;
h) in a toroid tuning probe #2 positioning measurement loop,
move toroid tuning probe #2 in a multitude of N+1 steps X2j from the position X20 to a position X2MAX equal to X1MAX plus one half of a wavelength λ/2(F), where N>1 and 0≤j≤N, measure s-parameters of the tuner and save in a file comprising s-parameter matrices [S2]=[S(A0, X10, X2j)] a s-parameter function of X2 at the withdrawal setting A0 of the RF energy-absorbing sliver and the initial setting X10 of the toroid tuning probe #1;
i) cascade the inverse matrix [S0]−1 with the matrices [S1] and save as matrices [S1E];
j) cascade the inverse matrix [S0]−1 with the matrices [S2] and save as matrices [S2E];
k) cascade all permutations (P+1)*(N+1)*(M+1) of the s-parameter matrices [SA], [S1E] and [S2E] and save in a tuner s-parameter calibration file.