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A Method for Measuring Complex Permittivity of Nonmagnetic Materials Based on Rectangular Cavity Perturbation Method

A technology of complex permittivity and non-magnetic materials, applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc.

Active Publication Date: 2020-10-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By changing the placement position of the sample to be tested and placing it in the center or other positions according to the characteristics of the sample, the present invention effectively solves the problem that the current resonant cavity perturbation method can only test medium and low loss dielectric materials, and realizes the non-magnetic material composite. The test of dielectric constant has the characteristics of high test accuracy and simple method

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  • A Method for Measuring Complex Permittivity of Nonmagnetic Materials Based on Rectangular Cavity Perturbation Method
  • A Method for Measuring Complex Permittivity of Nonmagnetic Materials Based on Rectangular Cavity Perturbation Method
  • A Method for Measuring Complex Permittivity of Nonmagnetic Materials Based on Rectangular Cavity Perturbation Method

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Embodiment 1

[0036] This embodiment provides a method for measuring the complex permittivity of non-magnetic materials based on the rectangular cavity perturbation method. The selected rectangular cavity is a BJ22 waveguide with a length of 1.5 waveguide wavelengths and a volume of 109.2mm×54.6mm×222mm. The selected mode is TE 103 mode; the material to be tested is the reference value of the real part of the dielectric constant ε r and loss tangent reference value tanδ r known water. The specific process is as follows: First, look up the table to obtain the reference value of the real part of the dielectric constant of deionized water at 0-3GHz and 15°C r =79, loss tangent reference value tanδ r =0.2050, according to the calculation, the real part reference value of the dielectric constant ε can be obtained r and loss tangent reference value tanδ r The product of ε r tanδ r =16.195≥10, the distance between the center of the water to be measured and the center of the rectangular res...

Embodiment 2

[0039] This embodiment provides a method for measuring the complex permittivity of non-magnetic materials based on the rectangular cavity perturbation method. The selected rectangular cavity is a BJ22 waveguide with a length of 1.5 waveguide wavelengths and a volume of 109.2mm×54.6mm×222mm. The selected mode is TE 103 mode; the material to be tested is the reference value of the real part of the dielectric constant ε r and loss tangent reference value tanδ r For an unknown liquid, choose a plastic tube with a small real part of the dielectric constant and a small loss tangent and a thickness of about 0.25mm as the container for the liquid to be tested. The specific process is as follows: firstly, the liquid to be tested is placed in the sample hole in the center of the rectangular cavity. The diameter of the sample hole is 6.5mm. The measured resonance curve is flat, and the 3dB point cannot be found, that is, the resonance frequency and the load cannot be tested. Q value; t...

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Abstract

The invention provides a method for measuring the complex permittivity of non-magnetic materials based on the rectangular cavity perturbation method, which belongs to the technical field of dielectric constant measurement of microwave and millimeter wave dielectric materials. By changing the placement position of the sample when measuring the dielectric constant of the material by the rectangular cavity perturbation method from the center position of the common rectangular cavity, which is the place where the electric field is the strongest and the magnetic field is the weakest, to different positions according to the characteristics of the sample, it effectively solves the current problem. The resonant cavity perturbation method can only test the problem of medium and low loss dielectric materials, realizes the test of the complex dielectric constant of non-magnetic materials, and has the characteristics of wide test range, high test accuracy and simple method.

Description

technical field [0001] The invention belongs to the technical field of dielectric constant measurement of microwave and millimeter wave dielectric materials. Specifically, it is composed of a rectangular resonant cavity with small holes for placing rod-shaped test samples at different positions from the center of the resonant cavity and a test fixture. A testing system and method for the complex permittivity of a dielectric material that can greatly broaden the measurement range. Background technique [0002] Microwave dielectric materials are widely used in communication, national defense, electronics, microwave heating, microwave remote sensing, microwave imaging and other fields. The electromagnetic parameters of microwave dielectric materials are usually expressed by complex permittivity and complex permeability, namely: ε(jω)= ε'(jω)-jε”(jω), μ(jω)=μ’(jω)-jμ”(jω), where the ratio of the imaginary part to the real part of the complex permittivity is called the loss tange...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
CPCG01R27/2623G01R27/2635
Inventor 曾葆青朱可棋吴喆王战亮宫玉彬柳建龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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