Material complex permittivity testing system and method based on tapered coaxial resonator

Abstract

The invention provides a material complex permittivity testing system and method based on a tapered coaxial resonator. The test system includes a tapered coaxial resonator and a coupling device. The steps of the testing method include: 1) testing and recording the unloaded The resonant frequency f of the cavity working mode corresponding to the sample 0 and quality factor Q 0 ; 2) measure the diameter of the sample to be tested as D S , thickness d S , put it in the sample area, test and record the resonant frequency f corresponding to the working mode of the cavity after loading the sample S and quality factor Q S ; 3) Utilize resonant cavity perturbation theory, can calculate the complex permittivity of the material to be tested; The present invention has realized the complex permittivity high-precision test of microwave dielectric material at normal temperature, can not only reduce the required cavity of low-frequency test The body size and the size of the sample can be used, and the complex dielectric constant test of liquid and powder materials can be completed by using the bottom-sealed tube clamp.

Description

technical field [0001] The invention belongs to the technical field of testing the dielectric properties of microwave materials, and in particular relates to a testing system and method for the complex dielectric constant of dielectric materials based on a tapered coaxial resonant cavity. Background technique [0002] With the rapid development of high-speed signal processing, communication and other technologies, in military equipment, aerospace, radar stealth, microwave integrated circuits and many other fields, high-performance microwave materials are used as electromagnetic wave transmission media, and their applications are becoming more and more extensive. In the evaluation of the dielectric properties of microwave materials, the complex permittivity is an extremely important electrical performance parameter, and its accurate measurement is essential. Usually the complex permittivity adopts ε=ε 0 (ε'-jε")=ε 0 ε'(1-jtanδ), which are the two most basic characteristic p...

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Problems solved by technology

Japan's Ryotaro Inoue and Yasuhiko Odat et al. proposed a method for testing the complex permittivity of dielectric materials using a coaxial open resonator, but this method has high operating requirements for testers, and the sample is placed above the fixture. The random state has a great influence on the result

Bogdan A.Galwas et al. directly extend the length of the outer conductor of the coaxial line to achieve the effect of open circuit at the terminal, thus forming a λ / 4 coaxial resonant cavity for testing. This method requires a large lateral dimension, a narrow test frequency band, and the need Adding a piece of material with a known dielectric constant will increase the error term, which is difficult to deduct

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