Patent ID: 8497745

Claim:
A calibration technique of impedance tuners comprising N≧1 tuning elements, for a number of frequencies Fi, whereby 1≦i≦M and whereby Fi are arbitrary frequencies, including harmonic frequencies (F i+1 =(i+1)*Fi) said calibration technique comprising s-parameter measurement of said tuner using a pre-calibrated network analyzer; said calibration comprising four steps: a) measuring the s-parameter matrix of said tuner when all tuning elements are initialized (set to their neutral state) and saving the data in a s-parameter matrix {A}; b) measuring the s-parameters of said tuner when each element “i” is set to a number of states, all other tuning elements remaining initialized, and saving the data in an s-parameter matrix {Bi}; c) cascading the inverse matrix {A} −1 with all matrices {Bi}, except for matrix {B 1 }, resulting in matrices {Ci}={A} −1 *{Bi} and {C 1 }={B 1 }; d) numerically cascading all elements (s-parameters) of all matrices {Ci}, for i=1 to N in order to obtain the total calibration matrix {CT} of said multi-element tuner, comprising the s-parameters of said tuner for all permutations of settings of all tuning elements; e) saving matrix {CT} in computer memory for later use.