A coaxial cable testing method

Abstract

The invention relates to the technical field of material testing and particularly discloses a coaxial line testing method. Compared with a conventional coaxial line testing method, a metal ring calibration member is specially designed, the two ends of an air line can be directly calibrated by loading the metal ring calibration member, and the problem that a non-special adapter is difficult to calibrate the ports of the air line. The testing method includes the following steps of respectively testing the scattering parameters of an air line, an air line with an inner conductor sleeved by a metal ring, and an air line with an inner conductor sleeved by material to be tested; and calculating the dielectric constant and / or the magnetic permeability of the material to be tested based on the scattering parameters obtained from the test. According to the testing method, a calibration member matched with a coaxial adapter is not needed, and also the absolute position of the material to be tested inside the coaxial line is not needed to be adjusted, therefore the error caused by the deviation of the actual position and measurement position of the material in the coaxial line can be prevented while the cost is saved.

Description

technical field [0001] The invention relates to the technical field of material testing, and specifically discloses a coaxial line testing method. Background technique [0002] The measurement technology of electromagnetic parameters of materials has always been an important research topic in the fields of material science, microwave circuit design, biological electromagnetic effects, and microwave-absorbing stealth technology. At present, the measurement of the coaxial method mainly uses standard mechanical or electronic calibration devices to measure after calibration; in the specific measurement, it is necessary to use the calibration device in conjunction with the coaxial adapter, and it is necessary to align the absolute position inside the coaxial line. position to obtain more accurate measurement results. [0003] The existing measurement methods have the following problems: 1. The price of the calibration device used in conjunction with the coaxial adapter is very e...

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Problems solved by technology

[0003] The existing measurement methods have the following problems: 1. The price of the calibration device used in conjunction with the coaxial adapter is very expensive. Both the common calibration device and the corresponding software cost thousands of dollars, resulting in high measurement costs; 2. Need to obtain The absolute position of the sample to be tested in the coaxial axis, the measurement of the absolute position is difficult to avoid human errors, and the accuracy of the test results cannot be guaranteed; 3. The traditional NRW algorithm has thickness resonance problems for magnetic materials or materials with large losses, which is difficult solve

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