A non-inserting device measurement and calibration method

Abstract

The invention proposes a non-plug-in device measurement and calibration method, which solves the problem of the existing non-plug-in calibration method on the hardware structure scheme of the vector network analyzer, the measurement condition setting, the performance index of the straight-through adapter and the professional skills of the measurement personnel. There are some special request questions. The present invention proposes a calibration method that utilizes the extra measurement port that is not used by the vector network analyzer to configure an ideal zero through calibration environment. As a bridge, accurate load matching error and transmission tracking error between non-intrusive measurement ports are obtained, the requirements for calibration are reduced and simplified, and the accuracy of non-intrusive calibration is improved.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a method for measuring and calibrating non-inserted devices. Background technique [0002] Most of the microwave modules used in RF microwave systems usually have the same type of port connectors. Traditionally, microwave modules often use female coaxial connectors. Most of the microwave modules need to use the vector network analyzer to measure their performance indicators before use, and the vector network analyzer must be calibrated before the measurement to determine the size of the system error in the measurement system itself, and then in the measurement By using the error correction algorithm to remove the influence of these systematic errors on the measurement accuracy, the real performance index of the tested part can be obtained. The calibration of a vector network analyzer is the process of determining various system errors of the measurement system itself by measurin...

AI Technical Summary

Problems solved by technology

In addition, in the data model of the straight-through standard, it is considered that the straight-through standard is reciprocal, that is, the forward and reverse transmission characteristics are consistent, and the port mismatch characteristics of the straight-through standard are not considered, and the port impedance of the straight-through standard is considered to be ideally matched. Affects the calibration accuracy. In order to obtain high calibration accuracy, a precise straight-through adapter must be used, which will increase the calibration cost

[0007] The second method is to use a calibration method called adapter removal. The limitations and disadvantages of this method include the same requirements that the adapters are reciprocal, the ports are ideally matched, and there are certain restrictions on the frequency separation between measurement points. And the calibration process is very cumbersome, and this calibration method is rarely used now

[0010] (2) The straight-through adapter is also required to be reciprocal, and its forward and reverse transmission characteristics are exactly the same, and any deviation of the actual characteristics will generate residual calibration errors

[0031] (1) It is required that the vector network analyzer must adopt a double reflectometer 2N receiving structure. The hardware cost of the vector network analyzer using this structural scheme is usually high, especially in the case of a large number of ports. Structured vector network analyzer, unable to perform unknown thru calibration

[0032] (2) A reciprocal precision adapter with the same forward and reverse transmission characteristics needs to be used during calibration. If there are differences in the front and reverse transmission characteristics of the straight-through adapter, these differences will be transformed into residual errors after calibration, which will affect the calibration accuracy

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