scholarly journals Measurement Methods and Extraction Techniques to Obtain the Dielectric Properties of Materials

2019 ◽  
Author(s):  
Turgut Ozturk ◽  
Muhammet Tahir Güneşer
Keyword(s):  
Dielectric Properties ◽  
Measurement Methods ◽  
Extraction Techniques ◽  
Properties Of Materials

scholarly journals Analysis of methods for measuring the dielectric properties of materials in the microwave range of wavelengths.

2021 ◽  
Author(s):  
D.G. Fomin ◽  
◽  
N.V. Dudarev ◽  
S.N. Darovskikh ◽  
◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Communication Systems ◽  
Electronic Devices ◽  
Microwave Range ◽  
Advantages And Disadvantages ◽  
Microwave Electronic ◽  
Functional Features ◽  
Properties Of Materials ◽  
Materials Used ◽  
Resonant Method

One of the modern trends in the development of communication systems, information and telecommunication systems, air traffic control systems, etc. is the transition and development of higher-frequency wavelength ranges. In this regard more and more stringent requirements (in terms of spectrum, out-of-band and spurious radio emission, and in the shape of the output signal) are imposed on radio engineering devices that transmit and receive microwave radio signals. As a result, the requirements for the design and functional features of microwave electronic devices are increasing. One of these requirements is to assess the degree of compliance with the required values of dielectric properties of materials used in the design of microwave electronic devices. This requirement is justified by the fact that the electrical parameters of such microwave devices as: strip filters, power dividers, printed antennas and others, directly depend on the dielectric properties of the materials used in their substrate designs. In this regard, three main methods have now emerged for assessing the dielectric properties of materials: the resonant method, the non-resonant method, and the free space method. Aim. The aim of this article is to carry out a comparative analysis of the known methods for measuring the dielectric properties of materials in the microwave range of wavelengths and devices for their implementation. Materials and methods. The authors of the article reviewed the scientific literature of domestic and foreign publications. Results. For each of the methods for measuring the dielectric properties of materials, their main idea, practical implementation, a mathematical model for processing experimental data and areas of application are given. The advantages and disadvantages for each of the methods for measuring the dielectric properties of materials are given too. Conclusion. The applicability of each of the considered methods depends on such factors as: the shape of the investigated dielectric material, its state of aggregation, the possibility of measuring amplitude or complex transmission and reflection coefficients, the presence of an anechoic chamber, etc.

Dielectric Relaxation Process and Microwave Heating Mechanism in ε-Caprolactone as a Function of Frequency and Temperature

2014 ◽  
Vol 931-932 ◽  
pp. 205-209 ◽  
Author(s):  
Mohd Johari Kamaruddin ◽  
Anwar Johari ◽  
Ramli Mat ◽  
Tuan Amran Tuan Abdullah ◽  
Siti Hamidah Mohd Setapar ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Heating ◽  
Processing System ◽  
Debye Model ◽  
Microwave Energy ◽  
Dielectric Relaxation Process ◽  
Microwave Assisted ◽  
Heating Mechanism ◽  
Wide Range ◽  
Properties Of Materials

Dielectric properties of materials play a significant role in design of microwave assisted processing system. This paper is focused on the dielectric properties of ε-caprolactone (ε-cap) which is the monomer for the biodegradable polymer, Poly (ε-caprolactone) (PCL). The dielectric properties of ε-cap were measured across a wide range of frequencies (0.1 GHz5.0 GHz) and temperatures (20-150oC). Then the measured dielectric properties data was modelled using Debye model in order to relate quantitatively the dielectric properties to microwave heating mechanisms. The analysis carried out gives a clear picture of interaction of ε-cap with microwave energy and its heating mechanism in microwave assisted polymerisation process. This study concluded that microwave heating mechanism of the ε-cap in the measured range may be dominated by the dipole reorientation.

Dielectric properties measurement methods for solids of high permittivities under microwave frequencies and between 20 and 250 °C

2017 ◽  
Vol 122 ◽  
pp. 339-345 ◽  
Author(s):  
Isabelle Polaert ◽  
Nassima Benamara ◽  
Junwu Tao ◽  
Tan-Hoa Vuong ◽  
Marc Ferrato ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Measurement Methods ◽  
Microwave Frequencies

scholarly journals A Time-Domain Reflectometry Method with Variable Needle Pulse Width for Measuring the Dielectric Properties of Materials

Sensors ◽  
2016 ◽  
Vol 16 (2) ◽  
pp. 191 ◽  
Author(s):  
Andrzej Wilczek ◽  
Agnieszka Szypłowska ◽  
Marcin Kafarski ◽  
Wojciech Skierucha
Keyword(s):  
Dielectric Properties ◽  
Time Domain ◽  
Pulse Width ◽  
Time Domain Reflectometry ◽  
Properties Of Materials
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