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D. V. Perov

ESTIMATING COMPLEX DIELECTRIC PERMITTIVITY OF MATERIALS BY THE FREQUENCY DEPENDENCES OF REFLECTION AND TRANSMISSION COEFFICIENT MAGNITUDES IN THE MICROWAVE RANGE

DOI: 10.17804/2410-9908.2023.4.060-072

Electromagnetic waves of the microwave range are an effective tool for solving problems of non-destructive testing and diagnostics as applied to dielectric, semiconductor, and composite materials, ferrite products. An algorithm is suggested for estimating the complex permittivity of non-magnetic materials by the frequency dependences of reflection and transmission coefficient magnitudes during the interaction of electromagnetic waves in the microwave range with a sample in the form of a plate located in the cross section of a closed rectangular waveguide. Statistical analysis methods are applied to evaluating the errors arising during the application of this algorithm due to imperfect matching of the waveguide measurement path with the receivers and generator of the scalar circuit analyzer. It is shown that the proposed algorithm using the results of measuring reflection and transmission coefficients in a wide frequency range can significantly reduce the influence of frequency-dependent measurement errors on the accuracy of complex permittivity estimation. An additional advantage of the algorithm is that its implementation does not require vector network analyzers, which are very expensive.

Acknowledgments: The results were obtained within the state assignment from the Ministry of Science and Higher Education of Russia, themes No. 122021000036-3 “Spin” and No. 122021000035-6 “Function”.

Keywords: radiowave non-destructive testing merthods, microwave measurements, super high frequencies, scalar circuit analyzer, reflection and transmission coefficients, complex dielectric permittivity

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Article reference

Perov D. V. Estimating Complex Dielectric Permittivity of Materials by the Frequency Dependences of Reflection and Transmission Coefficient Magnitudes in the Microwave Range // Diagnostics, Resource and Mechanics of materials and structures. - 2023. - Iss. 4. - P. 60-72. -
DOI: 10.17804/2410-9908.2023.4.060-072. -
URL: http://eng.dream-journal.org/issues/content/article_407.html
(accessed: 05/22/2024).

 

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