Method of microwave measurement of dielectric permittivity in a small volume of high loss liquid

Eremenko, Z. E.; Ganapolskii, E.M.

doi:10.1088/0957-0233/14/12/008

Cited by 19 publications

(21 citation statements)

References 11 publications

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“…The characteristics of studied waves strongly depend on dielectric properties of 8 Advances in Condensed Matter Physics high loss medium. It gives the opportunity to use such waves for complex permittivity measurements of high loss media [14,17,18].…”

Section: Resultsmentioning

confidence: 99%

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The Electromagnetic Wave Propagation on the Interface between Low and High Loss Dielectrics

Eremenko

2010

Advances in Condensed Matter Physics

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The wave propagation on closed curved interface (a rod or ball) between low and high loss dielectrics was studied and compared with well-known wave propagation problem on flat plane interface between low loss and high loss media. We have studied the propagation of a cylindrical wave along a round dielectric rod immersed into a high loss medium and a spherical wave forming by the oscillations in a dielectric ball immersed into a high loss medium as well. These waves have surface character similar to the wave known as the Zenneck surface wave. The distinctive characteristic of such cylindrical or spherical waves: the more loss in high loss medium the greater its surface character. We showed that the wave attenuation is essentially small at enough big dissipative loss in outer medium of dielectric structures.

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Section: Resultsmentioning

confidence: 99%

“…At k z2 increasing the field drives into the interface on the high loss medium side. Here there is so-called pushing-out effect for the electromagnetic field in high loss medium [17][18][19].…”

Section: The Wave On the Flat Plane Interfacementioning

confidence: 99%

The Electromagnetic Wave Propagation on the Interface between Low and High Loss Dielectrics

Eremenko

2010

Advances in Condensed Matter Physics

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“…Cross section is shown. structure may be useful for measuring the electrical properties of liquid or granular samples [39], [40] placed at the center of the dielectric ring. The dimensions of the cavity are chosen to be mm and mm and the parameters of the dielectric ring are , mm, mm, and .…”

Section: B Perturbed Dielectric Ring Resonatormentioning

confidence: 99%

Parametric History Analysis for Material Properties Using Finite Elements and Adaptive Perturbations

Günel

Zoral

2015

IEEE Trans. Microwave Theory Techn.

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When microwave structures are perturbed by the presence of an external material, the resonant frequencies shift depending on the location and the electrical properties of the perturber. Such a shift can be used to determine the properties of the perturber, as well as variations with respect to an additional parameter such as the temperature. The finite-element method can be used to study these effects numerically. When the electrical parameters of the perturber are changed in an attempt to fine tuning or optimization of the structure, the numerical analysis requires resulting finite-element equations to be solved for each value of the perturbation parameter, repetitively. In this paper, we present the step-by-step eigenvalue perturbation technique to reduce the computational cost of such analysis significantly. The arising generalized eigenvalue problem is solved by successive iterations of eigenvalue perturbations. The step size of the sequential perturbations is chosen adaptively such that corresponding generalized eigenvalue problem is valid physically. The technique is especially effective when used with finite-element methods due to the characteristic symmetric structure of the matrices of the associated generalized eigenvalue problem.Index Terms-Cavity perturbation, dielectric ring resonator, eigenvalues and eigenfunctions, fast parametric sweeps, finite elements, parametric history analysis, perturbation methods, sensitivity.

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“…In this context, a large number of dielectric studies have been carried out extensively to understand the intermolecular dynamics of liquid mixtures [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Broadband complex permittivity determination using a two-port U-shaped coplanar waveguide with artificial neutral network algorithm

Yang

Zhu

et al. 2015

International Journal of Applied Electromagnetics and Mechanics

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A two-port U-shaped Coplanar Waveguide (U-CPW) used for broadband complex permittivity measurement of high loss solutions is presented. Compared with the one-port measurement device, this two-port U-CPW coupled with artificial neural networks algorithm has the ability of reducing the multiple-solutions. Also, the measured T/R (transmission/reflection) coefficients were used instead of simulated reflection coefficients for training the neural networks that enhanced the accuracy of measurement results. Two real-valued neural networks associated with the U-CPW are used to reconstruct the two parts of the complex permittivity separately from the measured T/R coefficients. First, a large number of measured T/R coefficients of broadband frequency points of ethanol-water mixtures along with their theoretical complex permittivity are used to train two separate neural networks. Second, the trained networks are employed to reconstruct the complex permittivity of other solutions using the measured T/R coefficients. Compared with the results of Cole-Cole equation, the reconstructed results of methanol-water mixtures and ethanol-methanol mixtures at different volume fractions have been obtained with sufficient degree of accuracy in the frequency range 1-3 GHz at 20 • C. For predicted values using the developed artificial neural network (ANN) architecture and those obtained from literature, the average relative errors of real and imaginary parts of complex permittivity are 2.27% and 2.12%, respectively.

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Method of microwave measurement of dielectric permittivity in a small volume of high loss liquid

Cited by 19 publications

References 11 publications

The Electromagnetic Wave Propagation on the Interface between Low and High Loss Dielectrics

The Electromagnetic Wave Propagation on the Interface between Low and High Loss Dielectrics

Parametric History Analysis for Material Properties Using Finite Elements and Adaptive Perturbations

Broadband complex permittivity determination using a two-port U-shaped coplanar waveguide with artificial neutral network algorithm

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