Method for reducing fringing capacitance of open-circuit device calibration component and open-circuit device calibration component

Abstract

The present invention belongs to the test instrument field and discloses a method for reducing the fringing capacitance of an open-circuit device calibration component. According to the method, the capacitance of the open-circuit device calibration component is set to be coaxial gradient changing capacitance, so that the fringing capacitance of the termination end of the open-circuit device calibration component can be effectively reduced. The invention also discloses an open-circuit device calibration component. The open-circuit device calibration component comprises an outer conductor and an inner conductor; the outer conductor is a hollow shell having a tapered chamber inside; the inner conductor is a solid tapered core body; the inner conductor is coaxially arranged inside the tapered chamber of the outer conductor; the end surfaces of the starting ends of the inner conductor and outer conductor are large-diameter ends and are located in the same end surface; and along the axial direction of the open-circuit device calibration component, the ratio of the inner diameter of the outer conductor to the outer diameter of the inner conductor in any one of radial cross sections is a fixed value. According to the method of the invention, the outer conductor and the inner conductor are designed into the tapered structures, and therefore, the fringing capacitance of the termination ends of the two conductors can be effectively reduced, and the measurement errors of a vector network analyzer can be decreased.

Description

technical field [0001] The invention relates to the field of test instruments, in particular to a method for reducing the fringe capacitance of an open circuit calibration part and the open circuit calibration part. Background technique [0002] The vector network analyzer is a major microwave measurement tool, which is widely used in the characteristic measurement of radio frequency microwave devices, such as passive devices such as attenuators, filters, power splitters and active devices such as amplifiers. [0003] The important feature that distinguishes vector network analyzers from other instruments is the need for complex calibration algorithms. Common vector network analyzer calibration methods include SOLT method and TRL method. [0004] The SOLT method is mainly used in coaxial system testing, such as the most common interface for SMA DUTs. The SOLT calibration method uses three calibration components: Open, Short and Load to complete single-port calibration. For ...

AI Technical Summary

Problems solved by technology

For the three calibration parts used in single-port network calibration, the deviation of the short circuit from the rational short circuit due to its own characteristics is very small, and can be ignored in most cases; the main index of the load calibration part is return loss , the return loss of well-designed load calibration parts in the whole frequency band is >40dB, which meets most of the test requirements; it is difficult to accurately describe the characteristics of the open circuit calibration parts due to the existence of fringe capacitance. During the calibration process, The calibration capacitance of the open circuit device must be compensated, that is, the influence of the edge capacitance of the open circuit is removed during the calibration process. However, in actual operation, due to different operation processes, errors are often introduced and affect the calibration effect.

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