Experimental Complex Permittivity Characterization of Mixed Dielectric Materials over a Broadband Frequency

Gihyeon Ji; Joonhyun Kim; Yungseon Eo

doi:10.3938/jkps.75.309

An approach based on ANFIS and input selection procedure for microwave characterization of dielectric materials

COMPEL The International Journal for Computation and Mathematics in Electrical and Electronic Engineering ◽

10.1108/compel-05-2017-0208 ◽

2018 ◽

Vol 37 (2) ◽

pp. 799-813 ◽

Cited By ~ 1

Author(s):

Hakim Sadou ◽

Tarik Hacib ◽

Hulusi Acikgoz ◽

Yann Le-Bihan ◽

Olivier Meyer ◽

...

Keyword(s):

Inverse Problem ◽

Complex Permittivity ◽

Selection Procedure ◽

Dielectric Materials ◽

Inference System ◽

Content Type ◽

Input Selection ◽

Microwave Characterization ◽

Optimal Inputs

PurposeThe principle of microwave characterization of dielectric materials using open-ended coaxial line probe is to link the dielectric properties of the sample under test to the measurements of the probe admittance (Y(f) = G(f)+ jB(f )). The purpose of this paper is to develop an alternative inversion tool able to predict the evolution of the complex permittivity (ε = ε′ – jε″) on a broad band frequency (f from 1 MHz to 1.8 GHz). Design/methodology/approachThe inverse problem is solved using adaptive network based fuzzy inference system (ANFIS) which needs the creation of a database for its learning. Unfortunately, train ANFIS using f, G and B as inputs has given unsatisfying results. Therefore, an inputs selection procedure is used to select the three optimal inputs from new inputs, created mathematically from original ones, using the Jang method. FindingsInversion results of measurements give, after training, in real time the complex permittivity of solid and liquid samples with a very good accuracy which prove the applicability of ANFIS to solve inverse problems in microwave characterization. Originality/valueThe originality of this paper consists on the use of ANFIS with input selection procedure based on the Jang method to solve the inverse problem where the three optimal inputs are selected from 26 new inputs created mathematically from original ones (f, G and B).

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Continuous Characterization of Permittivity over a Wide Bandwidth Using a Cavity Resonator

Journal of Electromagnetic Engineering and Science ◽

10.26866/jees.2020.20.1.39 ◽

2020 ◽

Vol 20 (1) ◽

pp. 39-44

Author(s):

Rehab S. Hassan ◽

Sung Ik Park ◽

Ashwini Kumar Arya ◽

Sanghoek Kim

Keyword(s):

Complex Permittivity ◽

Cavity Resonator ◽

Dielectric Materials ◽

Wide Frequency Range ◽

Wide Bandwidth ◽

Frequency Independent ◽

5 Ghz ◽

Continuous Determination

We examine a rectangular cavity resonator method to accurately characterize the complex permittivity of dielectric materials over a wide frequency range of 1–5 GHz by exploiting the fundamental mode and higher-order TE(1,0,l) modes. For this purpose, a rectangular waveguide is coupled with a cavity resonator through a large inductive aperture. The permittivity characterization at both even and odd TE(1,0,l) modes enables continuous determination of the permittivity over operating frequencies. The characterization of the permittivity for even TE(1,0,l) modes suffers from potential errors due to the displacement of materials. This paper also proposes a method to compensate for these errors and improve the accuracy in the even modes. The experimental results of the fabricated cavity are presented using different materials (frequency-independent and frequency-dependent). The measured complex permittivity results show a good agreement with the reported results over a wide bandwidth available in the literature.

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Characterization of Dielectric Materials by Sparse Signal Processing With Iterative Dictionary Updates

IEEE Sensors Letters ◽

10.1109/lsens.2020.3019924 ◽

2020 ◽

Vol 4 (9) ◽

pp. 1-4

Author(s):

Udaya S. K. P. Miriya Thanthrige ◽

Jan Barowski ◽

Ilona Rolfes ◽

Daniel Erni ◽

Thomas Kaiser ◽

...

Keyword(s):

Signal Processing ◽

Dielectric Materials ◽

Sparse Signal ◽

Sparse Signal Processing

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Complex Permittivity Characterization of Liquid Samples Based on a Split Ring Resonator (SRR)

Sensors ◽

10.3390/s21103385 ◽

2021 ◽

Vol 21 (10) ◽

pp. 3385

Author(s):

Jialu Ma ◽

Jingchao Tang ◽

Kaicheng Wang ◽

Lianghao Guo ◽

Yubin Gong ◽

...

Keyword(s):

Resonant Frequency ◽

Complex Permittivity ◽

Ring Resonator ◽

High Sensitivity ◽

Split Ring Resonator ◽

Debye Model ◽

Split Ring ◽

Liquid Samples ◽

Microwave Sensor

A complex permittivity characterization method for liquid samples has been proposed. The measurement is carried out based on a self-designed microwave sensor with a split ring resonator (SRR), the unload resonant frequency of which is 5.05 GHz. The liquid samples in capillary are placed in the resonant zone of the fabricated senor for high sensitivity measurement. The frequency shift of 58.7 MHz is achieved when the capillary is filled with ethanol, corresponding a sensitivity of 97.46 MHz/μL. The complex permittivity of methanol, ethanol, isopropanol (IPA) and deionized water at the resonant frequency are measured and calibrated by the first order Debye model. Then, the complex permittivity of different concentrations of aqueous solutions of these materials are measured by using the calibrated sensor system. The results show that the proposed sensor has high sensitivity and accuracy in measuring the complex permittivity of liquid samples with volumes as small as 0.13 μL. It provides a useful reference for the complex permittivity characterization of small amount of liquid chemical samples. In addition, the characterization of an important biological sample (inositol) is carried out by using the proposed sensor.

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Dielectric Characterization of Polyceram Films

MRS Proceedings ◽

10.1557/proc-180-407 ◽

1990 ◽

Vol 180 ◽

Cited By ~ 3

Author(s):

G. Teowee ◽

J.M. Boulton ◽

H.H. Fox ◽

A. Koussa ◽

T. Gudgel ◽

...

Keyword(s):

Dielectric Constant ◽

Polyethylene Oxide ◽

Dielectric Materials ◽

Inorganic Materials ◽

Functionalized Polymers ◽

Multifunctional Materials ◽

Dielectric Characterization ◽

Silicon Alkoxides ◽

Tan Δ

ABSTRACTPolycerams are an emergent class of hybrid, multifunctional materials which combine the properties of organic and inorganic materials. Films have been prepared from silicon alkoxides and reactive, functionalized polymers such as triethoxysilyl modified polybutadiene (MPBD), (N-triethoxysilylpropyl)O polyethylene oxide urethane (MPEOU) and trimethoxysilylpropyl substituted polyethyleneimine (MPEI). Characterization of dielectric constant and tan δ of the films has been carried out over a range of frequency from 500 Hz to 100 kHz; and the results are used to consider the potential of Polycerams as dielectric materials.

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