US 8,552,742 B2 · Calibration method for radio frequency scattering parameter measurements

Abstract

A calibration method for radio frequency scattering parameter measurements enabling self-calibration, which calibration method using a transmission line segment calibrator, a series device calibrator, a shunt device calibrator and a tested object measuring instrument, in which the lengths of the transmission lines in the series device calibrator and the shunt device calibrator are equal to the length of the transmission lines in the tested object measuring instrument such that the series device calibrator and the shunt device calibrator have the same error box as the tested object measuring instrument; and after acquiring the scattering parameter matrix of the error box through the calibration method, it is possible to connect a tested electronic device onto the tested object measuring instrument and perform operations on uncorrected measurement data thereof thereby obtaining the radio frequency scattering parameter of the tested object.

Claims4

Dependent claims

A calibration method for radio frequency scattering parameter measurements applying three calibrators, a tested object measuring instrument and equations of five variables, the three calibrators are respectively a transmission line segment calibrator, a series device calibrator and a shunt device calibrator;

the three calibrators and the tested object measuring instrument have the identical error boxes;
the scattering parameter matrix of the error box is obtained by the calibration method such that, after connecting a tested electronic device onto the tested object measuring instrument, performing operations on uncorrected measurement data thereby obtaining the radio frequency scattering parameter of the tested object.

A calibration method for radio frequency scattering parameter measurements, comprising:

(1) setting the measurement reference impedance of the transmission line to ZC, and setting a self-calibration equation including the variables t(=eγl),z,y,ztp,ysp;
(2) setting ysp, ztp in the self-calibration equation to 0, and then obtaining the values of γ, z, y;
(3) using γ to find the values of ysp, ztp;
(4) placing the values of ysp, ztp acquired from STEP 3 into the self-calibration equation conjunctively with the measurement results of the transmission line segment calibrator, the series device calibrator and the shunt device calibrator so as to get the values of γ′, z′, y′;
(5) after acquiring the values of y′sp, z′tp through γ′, performing operations on the error c;
(6) determining that if the error ε is less than the required error, then starting evaluation of the error box and execution of de-embedding process;
contrarily, if the error ε is still greater than the required error, returning to STEP 3 for repeating the operations until the error ε becomes less than the required error;
(7) using γ′ to figure out ZC and performing transmission line reference impedance conversion from ZC to Z0 thereby acquiring the scattering parameter of the actual tested object based on the reference impedance of Z0;
the equation for ysp is γls/2;
the equation for ztp is γlT/2;
and
the equation for ε is |y′sp−ysp|/|ysp|+|z′tp−ztp|/|ztp|.

9 more elements

Dependencies are inferred from the claim text.

Calibration method for radio frequency scattering parameter measurements

Life of this patent

Calibration method for radio frequency scattering parameter measurements

Life of this patent

Abstract

Claims4