Broadband Measurement of the Complex Permittivity of Ferroelectric Ceramicsin the Microwave Range

2018 ◽  
Vol 7 (4) ◽  
pp. 48-55
Author(s):  
A.V. Donchenko ◽  
◽  
V.V. Zemlyakov ◽  
M.A. Marahovskiy ◽  
A.E. Panich ◽  
...  
Keyword(s):  
Complex Permittivity ◽  
Microwave Range

Complex permittivity of epoxy composites with carbon nanotubes and TiO2 in microwave range

2021 ◽  
Vol 717 (1) ◽  
pp. 121-127
Author(s):  
O. V. Lozitsky ◽  
L. L. Vovchenko ◽  
L. Y. Matzui ◽  
V. V. Zagorodnii ◽  
V. V. Oliynyk ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Complex Permittivity ◽  
Epoxy Composites ◽  
Microwave Range

Контроль диэлектрической проницаемости и толщины анизотропных диэлектрических покрытий методом поверхностных электромагнитных волн

2021 ◽  
Vol 6 ◽  
pp. 57-72
Author(s):  
А.И. Казьмин ◽  
П.А. Федюнин ◽  
Д.П. Федюнин
Keyword(s):  
Complex Permittivity ◽  
Electromagnetic Waves ◽  
Field Experiments ◽  
Frequency Dispersion ◽  
Permittivity Tensor ◽  
Microwave Range ◽  
Metal Base ◽  
Dielectric Coatings ◽  
Statistical Limit ◽  
Search And Selection

The widespread use of anisotropic composite dielectric coatings operating in the microwave range in various science-intensive areas has led to the search and selection of effective methods of radio wave nondestructive testing of their electrophysical parameters. The existing approaches based on the estimation of the reflection and transmission coefficients of electromagnetic waves have low accuracy and reliability of estimating the components of the complex permittivity tensor and the thickness of such coatings, do not take into account their frequency dispersion and placement on a metal base. We present the new method of local measurements of components of the complex permittivity tensor with allowance for their frequency dispersion and a thickness anisotropic dielectric coatings with radial surface microwaves. The method is based on the solution of inverse problem in the determination of components of the complex permittivity tensor and a thickness coatings from the frequency and angular dependence of the attenuation coefficient of the field of a radial surface electromagnetic wave excited in a test sample. A numerical and experimental study show that for a measurement bandwidth of 9–13,5 GHz the errors in estimating the anisotropy coefficients do not exceed 10% with a confidence coefficient of 0.95. We introduce and substantiate a statistical limit of the resolution of the anisotropy of permittivity; this makes it possible to evaluate the possibility of discriminating between two close values any pair of components of the permittivity tensor. Numerical and field experiments have shown that the method can provide their assessment with a difference of 0.2–0.3% or less in the frequency band of 9–13.5 GHz.

Determination of the Frequency Dependence of Complex Permittivity in the Pseudo-Microwave Range by an Advanced Perturbation Method

1994 ◽  
Vol 33 (Part 1, No. 9B) ◽  
pp. 5510-5513 ◽  
Author(s):  
Takeshi Takahashi ◽  
Yasushi Iijima ◽  
Makoto Kobayashi ◽  
Taro Miura
Keyword(s):  
Perturbation Method ◽  
Frequency Dependence ◽  
Complex Permittivity ◽  
Microwave Range

scholarly journals Electromagnetic characteristics of filaments for 3D printing with carbon fillers in the microwave range

2019 ◽  
Vol 30 ◽  
pp. 07010
Author(s):  
Grigoriy E. Kuleshov ◽  
Alexander V. Badin ◽  
Kirill V. Bilinsky ◽  
Kirill V. Dorozhkin
Keyword(s):  
Composite Materials ◽  
3D Printing ◽  
Complex Permittivity ◽  
Electromagnetic Response ◽  
Microwave Range ◽  
Additive Technology ◽  
New Radio ◽  
Electromagnetic Characteristics ◽  
Carbon Fillers ◽  
Conductive Plastics

The results of a study of the complex permittivity and electromagnetic response from polymer composite materials obtained by additive technology from 3D printing filaments containing various carbon fillers are presented. New radio filaments for 3D printing with MWCNTs have been created. Investigated PLA-Conductive plastics may be used to create a shielding coating or narrowband absorbers for microwave range.

Comparison Study on Microwave Absorbing Properties of SiC Absorbers

2011 ◽  
Vol 117-119 ◽  
pp. 1057-1060 ◽  
Author(s):  
Gu Liu ◽  
Liu Ying Wang ◽  
Gui Ming Chen ◽  
Wan Ning Wei ◽  
Chao Qun Ge ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Reflection Loss ◽  
Complex Permittivity ◽  
Microwave Range ◽  
Comparison Study ◽  
Frequency Range ◽  
Attenuation Constant ◽  
Microwave Absorbing Properties ◽  
Different Types ◽  
Minimum Reflection Loss

In this paper, we have studied on the absorbing properties of three different types of SiC absorbers such as ultra-fine SiC, SiC whisker and nanometer SiC. Electromagnetic parameters of the three types of SiC were tested in the frequency range of 2~18GHz. Both the real and imaginary parts of complex permittivity of nanometer SiC are higher than that of others. The attenuation constant of nanometer SiC is higher than that of ultra-fine SiC and SiC whisker, increasing from 93.7 to 766.5 with increasing frequency. The minimum reflection loss of -5.53 dB was obtained at 9.72 GHz for the nanometer SiC. The nanometer SiC suggests a better capacity of dielectric loss in microwave range than that of ultra-fine SiC and SiC whisker.

An Amplitude-Only Measurement Technique for the Evaluation of the Complex Permittivity Of Composite Materials in the Microwave Range.

1990 ◽  
Vol 189 ◽  
Author(s):  
B. Bisceglia ◽  
A. Ciliberto ◽  
G. D'Ambrosio ◽  
G. Ferrara ◽  
R. Massa ◽  
...  
Keyword(s):  
Numerical Calculation ◽  
Composite Materials ◽  
Transmission Line ◽  
Measurement Technique ◽  
Complex Permittivity ◽  
Rectangular Waveguide ◽  
Measurement Techniques ◽  
Microwave Range ◽  
Permittivity Measurement ◽  
Calculation Procedures

ABSTRACTThe basic transmission line and rectangular waveguide equations, with reference to different loading conditions, are firstly reviewed. Amplitude and phase, amplitudeonly, and phase-only permittivity measurement techniques are briefly discussed. Two very naive graphical and numerical calculation procedures are presented, together with the results of measurements on some composite materials.

High Precision Measurements of the Permittivity of Water in the Microwave Range

1990 ◽  
Vol 45 (5) ◽  
pp. 677-686 ◽  
Author(s):  
H. J. Steinhoff ◽  
A. Redhardt ◽  
K. Lieutenant ◽  
W. Chrost ◽  
G. Hess ◽  
...  
Keyword(s):  
Standard Method ◽  
Complex Permittivity ◽  
Systematic Errors ◽  
Precision Measurements ◽  
Limiting Factors ◽  
Microwave Range ◽  
Debye Function ◽  
High Loss ◽  
Relaxation Parameters

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

scholarly journals Plaster glue complex permittivity response in the microwave range

2004 ◽  
Vol 7 (4) ◽  
pp. 565-568
Author(s):  
Antonio Jeronimo Belfort de Oliveira ◽  
Marcos Tavares de Melo ◽  
Leane Lima Dias Cabral ◽  
Sérgio Romero Oliveira de Souza
Keyword(s):  
Complex Permittivity ◽  
Microwave Range
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