A closed coaxial transmission line testing system and method for characterizing the dielectric properties of a sample to be tested
A technology for testing system and dielectric characteristics, applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc., which can solve the problem of limited working range of coaxial transmission line fixtures, difficult to remove parasitic effects, and difficulty in expanding the test frequency range, etc. problem, to achieve the effect of good test repeatability, wide application range, accurate and reliable removal results
Active Publication Date: 2018-06-15
DALIAN UNIV OF TECH
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Problems solved by technology
[0005] For the coaxial transmission line test method in the prior art, it is difficult to remove the parasitic effect generated by the connector in the test fixture during the test process. Specific test materials have higher requirements on the application frequency range. The specific coaxial transmission line fixture has a limited working range and the test frequency range is expanded. difficult question
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[0041] In order to achieve the above effects, the invention will be further described below in conjunction with the accompanying drawings and embodiments:
[0042] A closed coaxial transmission line test system for characterizing the dielectric properties of liquid and solid materials, such as figure 2 Shown, comprise test fixture, vector network analyzer 9, computer 10 and test connecting wire 11; The cross-sectional structure schematic diagram of test fixture is as figure 1 As shown, the test fixture includes two-way SMA connectors ( image 3 , 4), screws 4, waterproof rubber gaskets 5, adapters 6 with openings at both ends connected to the structure (such as Figure 5 ,6,7), sample chamber 7 with electromagnetic shielding effect (such as Figure 9 ), the conductor 8 in the sample chamber (such as Figure 8 ) and the sample to be tested.
[0043] The bidirectional SMA joint is composed of a four-hole flange 1, a cylindrical cylindrical polytetrafluoroethylene 2 and a bi...
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The invention discloses a closed coaxial transmission line test system for testing dielectric property of liquid and solid materials. The closed coaxial transmission line test system comprises a test fixture, a vector network analyzer, a computer and a test connection line. The test fixture comprises a both-way SMA connector, screws, waterproof rubber washers, adapters, the two ends of each of which are opened and which are in a communication structure, a sample room having an electromagnetic shielding effect, a sample indoor conductor and a sample to be tested. The both-way SMA connector is formed by four-hole flanges, columnar cylindrical polytetrafluoroethylene and both-way SMA connector dual-female-connector coaxial inner conductors. Based on the organic combination of a transmission reflection method and de-embedding technology, test parasitic effect of a fixture interface is eliminated under the condition of not depending on a special customized calibration device or not carrying out complex mathematical modeling, thereby realizing accurate measurement of the dielectric property of the liquid and solid materials; processing requirement for the test sample is low; the fixture installation is simple; test work frequency range is flexible to expend; and application range is wide.
Description
technical field [0001] The invention belongs to the field of microwave testing, and relates to the characterization of the dielectric properties of liquid materials, solid or solid powder materials, in particular to a closed coaxial transmission line testing system for characterizing the dielectric properties of liquid and solid materials. Background technique [0002] The dielectric properties of a material are the unique electrical characteristics of each material, and accurate measurement and characterization of the dielectric properties of a material is critical to its proper use. Through the mastery of the dielectric properties of materials, key design parameter information can be provided for many electronic applications. Through an in-depth understanding of the dielectric properties of materials, it can be used in food safety testing, medical equipment design and use, aerospace design and other fields. Come to help, quickly and accurately grasp the dielectric properti...
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IPC IPC(8): G01R27/26
CPCG01R27/2623
Inventor 拉塞尔孙振翔刘长睿柳丽芬孙守林
Owner DALIAN UNIV OF TECH