Scalar network analyzer-based coaxial resonant cavity test method and system

Abstract

The invention discloses a scalar network analyzer-based coaxial resonant cavity test method and system. According to the method, a scalar network analyzer is controlled to adopt a non-uniform self-adaptive scanning processing mode in the scanning process; amplitude-frequency response data of a resonant cavity in a working state is acquired; and the acquired data is transmitted to a PC for calculation processing so as to obtain a dielectric property test result. Compared with the past coaxial resonance test methods, the method provided by the invention has the advantages that the scalar networkanalyzer is utilized to replace a vector network analyzer to construct the test system, so that the system cost is reduced; a program is utilized to control the scalar network analyzer to carry out signal self-adaptive scanning, so that the test scanning time is saved and the test efficiency is improved; and a discrete sampling point reverse difference is utilized to search a curve extreme pointto carry out fitting on an amplitude-frequency response curve, so that the test precision is improved.

Description

technical field [0001] The disclosure relates to the technical field of material testing, in particular to a coaxial resonant cavity testing method and system based on a scalar network analyzer. Background technique [0002] With the development of electronic technology, microwave materials are widely used in communication, radar, biomedicine, chemical industry and other fields. It is of great significance to accurately understand the electromagnetic characteristic parameters of microwave materials for their applications. The test method of coaxial resonant cavity based on scalar network analyzer has the characteristics of high precision, low cost, and fast test speed, and can meet the test of microwave dielectric materials represented by radome materials, composite materials, and dielectric materials for microwave components. It provides testing means for the design, production and high-performance application of microwave materials. [0003] For the testing of the dielec...

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Problems solved by technology

[0006] The vector network analyzer adopts linear scanning or segmental scanning during the scanning process, and linear step scanning is also used in the segment. The disadvantage of this method is that many points need to be scanned, for example image 3 The analysis vector network analyzer needs to scan 20,000 points during the fine encryption scanning process, resulting in a very long total scanning time

[0007] In the past, the accuracy of relative permittivity of materials tested by coaxial resonance test method was ±4%, which could not meet the needs of high-precision testing of electromagnetic properties of microwave materials.

[0008] In the past, the test method based on the vector network analyzer used the frequency sweep mode of the vector network analyzer, the sweep time was long, and the test accuracy of the dielectric constant was not high.

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