Single-port coaxial line complex permittivity measuring device and method based on mode matching

The technology of a complex dielectric constant and measuring device is applied in the field of single-port coaxial-type complex dielectric constant measuring device

Inactive Publication Date: 2013-06-12
ZHEJIANG UNIV
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Problems solved by technology

The traditional coaxial line method requires that only TEM waves exist in the coaxial waveguide filled with the sample to be tested, so the mathematical model is relatively si...

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  • Single-port coaxial line complex permittivity measuring device and method based on mode matching
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  • Single-port coaxial line complex permittivity measuring device and method based on mode matching

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The structure of the single-port coaxial complex dielectric constant measurement device based on mode matching is shown in the appendix figure 1 , where 1 is the standard coaxial cable connector, 2 is the coaxial waveguide section as the sample container, and 3 is the short-circuit metal plate. The standard coaxial cable connector here can be SMA or N-type head, etc. The lateral dimension of the coaxial waveguide section 2 does not depend on the coaxial cable connector 1, which is very beneficial for applications requiring large-capacity sample containers. The coaxial waveguide section 2 The inner and outer conductor diameters can be arbitrarily designed according to practical needs.

[0035] The schematic diagram of the measurement method is attached figure 2 As shown, 4 is a vector network analyzer, 5 is a measurement coaxial cable, and 6 is...

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Abstract

The invention provides a single-port coaxial line complex permittivity measuring device and a method based on mode matching. The single-port coaxial line complex permittivity measuring device comprises a coaxial line cable connector, a coaxial waveguide section and a terminal short circuit metal plate, wherein the coaxial line cable connector, the coaxial waveguide section and the terminal short circuit metal plate are connected in sequence, the lateral dimension of the coaxial waveguide section is not dependent on the size of the coaxial line cable connector, and the coaxial waveguide section works in a multimode state. The measuring method relates to the measuring device and a vector network analyzer. A reflection coefficient of a sensing device which is filled in substance to be measured is measured through the vector network analyzer and then through data processing, a complex permittivity of the substance is achieved through inversion. Due to the fact that a multimode matching model is used in the inversion process, the coaxial waveguide section can works in the multimode state, so that the design and processing demands of measuring and sensing devices are lowered and an upper limit of working frequency is improved.

Description

technical field [0001] The invention relates to a single-port coaxial line type complex dielectric constant measuring device and method based on mode matching. Background technique [0002] Measuring the complex permittivity of substances is of great significance in scientific research and industrial production, especially in the radio frequency microwave band. With the rapid development of electronic technology, the measurement frequency range and accuracy of vector network analyzers are getting larger and higher. The frequency domain measurement method of complex permittivity based on vector network analyzers has been widely studied, and one of the commonly used The broadband measurement method is the coaxial line method, which measures the reflection-transmission coefficient of the coaxial waveguide filled with the tested sample, and inverts the different frequencies according to the mathematical relationship between the reflection-transmission coefficient and the complex...

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Application Information

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IPC IPC(8): G01R27/26
Inventor 申发中冉立新
Owner ZHEJIANG UNIV
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