Two-port vector network analyzer calibration method based on weighted correction

A technology of vector network analysis and calibration method, which is applied in the calibration of two-port vector network analyzers based on weighted correction and the calibration of vector network analyzers. Small random error, the effect of reducing complexity

Active Publication Date: 2021-04-09
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

At present, there is no calibration method with high precision and simple derivation process

Method used

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  • Two-port vector network analyzer calibration method based on weighted correction
  • Two-port vector network analyzer calibration method based on weighted correction
  • Two-port vector network analyzer calibration method based on weighted correction

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Experimental program
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Embodiment 1

[0042] With the rapid development of science and technology, the research and development, production, maintenance and measurement of electronic equipment have higher and higher requirements for the measurement of radio frequency and microwave frequency bands, and the measurement of radio frequency and microwave frequency bands requires high-performance and reliable vector network analyzers. Vector network analyzers are the most widely used and powerful test instruments in the field of microwave and millimeter waves, and calibration is an indispensable key technology. Therefore, it is necessary to improve the calibration algorithm of the vector network analyzer. It is necessary to select a suitable combination of calibration components and cooperate with the corresponding algorithm to complete the calibration and error correction, so as to achieve accurate measurement of the scattering parameters of the vector network analyzer. At the same time, it is also hoped that in the mea...

Embodiment 2

[0066] The calibration method of the two-port vector network analyzer based on weighted correction is the same as embodiment 1, step 2) The ratio of the wave parameter to be measured when defining the two-port calibration described in the calibration coefficient is a two-port with any known characteristic The calibration part is connected between the two measurement ports of the vector network analyzer to obtain the wave parameter signal detected by the receiver and participate in the construction of the error network T matrix model, including the following steps:

[0067] 2.1 Construct the error network T-matrix model: connect any two-port calibration part with known characteristics between port 1 and port 2 of the vector network analyzer, and construct an error network by measuring the wave parameters of the calibration part; based on step 1 ) based on the error network mapping model established, combined with the definition of the scattering parameters of the two-port calibr...

Embodiment 3

[0084] The two-port vector network analyzer calibration method based on weighted correction is the same as that described in embodiment 1-2, step 3) by measuring a plurality of single-port calibration parts to obtain the ordinary least squares solution of the calibration coefficient, including the following steps :

[0085] 3.1 Construct the linear overdetermined equations of the calibration coefficients: connect the single-port calibration parts to the 1 port and the 2 port of the vector network analyzer respectively, measure multiple single-port calibration parts, and use the wave parameter signals detected by the receiver to derive The expressions of the reflection coefficient of the 1 port and the reflection coefficient of the 2 port are as follows:

[0086]

[0087]

[0088] In the formula, R represents the single-port calibration kit, the superscript “Rk1” represents the kth single-port calibration kit on port 1, and Γ Rk1 Indicates the reflection coefficient of t...

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Abstract

The invention discloses a two-port vector network analyzer calibration method based on weighted correction. The influence of random errors introduced by connection repeatability is reduced. The method comprises the steps of constructing an error network mapping model; constructing an error network T matrix model of the two ports, and defining the ratio of to-be-measured wave parameters during the calibration of the two ports as a calibration coefficient; measuring wave parameters of a plurality of single-port calibration parts, concluding a linear overdetermined equation set, and solving a common least square solution of a calibration coefficient; introducing a connection repeatability error of single-port calibration, and establishing a calibration coefficient correction value linear regression equation; performing weighted correction, and determining an error network T matrix of the vector network analyzer; and solving an estimated value of the scattering matrix of the to-be-measured piece. Connection repeatability errors are introduced, and an error network mapping model is reconstructed. The method can be used to effectively reduce the influence of random errors caused by the connection repeatability of the vector network analyzer, is high in calibration precision and flexible in calibration mode, and is used for calibration of the vector network analyzer.

Description

technical field [0001] The invention belongs to the technical field of instrumentation calibration, and mainly relates to the calibration of a two-port vector network analyzer, in particular to a calibration method for a two-port vector network analyzer based on weighted correction, which is used for the calibration of the vector network analyzer. [0002] technical background [0003] Vector network analyzers are the most widely used and powerful test instruments in the field of microwave and millimeter waves, and calibration is an indispensable key technology. As we all know, researchers need to select a suitable combination of calibration components and cooperate with corresponding algorithms to complete calibration and error correction, so as to achieve accurate measurement of scattering parameters. [0004] Among many calibration techniques, SOLT calibration uses short-circuit (Short, S), open-circuit (Open, O), load (Load, L) and straight-through (Thru, T) components wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 赵伟张涛郭钊
Owner XIDIAN UNIV
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