The waveguide method for the determination of complex permittivity of high loss liquid at the frequency range 5÷40 GHz

Abstract A practical version of a homodyne method for measuring the complex permittivity of high loss liquids at 3 and 9 GHz is described. The systematic errors are discussed in detail, because the homodyne method seems to be suitable as a simple standard method for precise measurements. The results of measurements on water in the temperature range 6 °C-45 °C are presented. The determination of all five parameters of the Debye function is possible. Finally, accuracy limiting factors for the determination of the relaxation parameters are discussed in detail

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Determination of dielectric permeability of substances by electromagnetic waveguide method

Journal of Physics and Electronics ◽

10.15421/332014 ◽

2020 ◽

Vol 28 (1) ◽

pp. 85-90

Author(s):

Vikt. V. Ovsyanikov ◽

E. R. Beznosova ◽

L. Z. Tsypko ◽

L. I. Filins’kyy ◽

Vl. V. Ovsyanikov

Keyword(s):

Dielectric Constant ◽

Reflection Coefficient ◽

Complex Permittivity ◽

Dielectric Permeability ◽

Microwave Range ◽

Electromagnetic Waveguide ◽

The Relationship ◽

Waveguide Method

A method for determining the complex permittivity of substances by the electromagnetic (EM) waveguide method in the microwave range using electrodynamics and the theory of multilayer dielectric structures is considered. The expression for the complex reflection coefficient of an EM wave in a waveguide with a substance sample is studied. Calculations of the dielectric constant of substances are carried out by analytical and numerical methods using computers. To obtain the desired complex permittivity of a substance, we use the relationship between the expression for the reflection coefficient modulus and the value of the standing wave coefficient over voltage measured in advance in the frequency range. The method is suitable for automation and application in enterprises producing and using fuels, construction and agricultural products. From the found value of the dielectric constant, the quality of substances can be determined. For example, the results of determining the dielectric constant several coals and solid-state foam are given.

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A One-Port Waveguide Method and its Application in Characterization of Radar Absorbing Materials

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.496-500.26 ◽

2014 ◽

Vol 496-500 ◽

pp. 26-29

Author(s):

Fei Zhao ◽

Chang Tao Sha ◽

Gang Zhao ◽

Ke Wang ◽

Jin Song Kan

Keyword(s):

Error Analysis ◽

Complex Permittivity ◽

Reflection Coefficients ◽

Phase Information ◽

High Loss ◽

Absorbing Materials ◽

Permittivity And Permeability ◽

Before And After ◽

Waveguide Method

A one-port waveguide method and related apparatus based on the multi-state techniques is descried in this paper. This method measures only the magnitude and phase information for the reflection coefficients of four-state before and after the samples under test being loaded. On the basis of such data, the complex permittivity and permeability of the samples can be simultaneous calculated by software programmed according to the related theories discussed herein. In addition, the error analysis is also discussed in this paper. The proposed method is applicable to measure magnetic and/or medium-to high-loss materials, hence it is suitable to characterize the properties of radar absorbing materials.

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Determination of Complex Permittivity of Fly Ash for Potential Electronic Applications

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.110-116.4292 ◽

2011 ◽

Vol 110-116 ◽

pp. 4292-4296 ◽

Cited By ~ 3

Author(s):

V. Naren Sreenivas ◽

D. Karthik ◽

V. Aravinth Kumar ◽

V.D. Sidharth ◽

T. Meenatchi Sundaram ◽

...

Keyword(s):

Fly Ash ◽

Complex Permittivity ◽

Power Plants ◽

Environmental Concern ◽

Thermal Power ◽

Transcendental Equation ◽

X Band ◽

Fly Ash Utilization ◽

Waveguide Method

Disposal of fly ash obtained from thermal power plants is a major environmental concern. Fly ash contains large proportions of silica and ferrites. Investigation of its prospects as an electronic material provides scope for enhanced fly ash utilization. This involves measurement of relative permittivity and loss tangent. Experiments are carried out at X band frequencies in TE10 mode using standard klystron waveguide setup. Shorted Waveguide Method is used to determine the complex permittivity. The complex transcendental equation obtained is solved using Genetic Algorithm. Experimental results are compared with theoretical estimates based on Landau Lifshitz Looyenga (LLL) equation.

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