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Methodical errors in measuring the specular reflection coefficient from a planar sample of material for two types of measuring facilities
https://doi.org/10.32446/0368-1025it.2021-6-44-50
Abstract
This paper is discussed two methods for measuring the bistatic scattering characteristics of flat samples of the material. The experimental studies and numerical simulations of the dependence of the specular reflection coefficient on the incident angle of wave on a flat material sample carried out in the bistatic scheme of the experiment (rotation of the receiving and transmitting antennas) and in the monostatic scheme using a dihedral corner reflector (rotation of the object). Measurements for the magnetodielectric flat sample were carried out in ITAE RAS on two test facilities with the corresponding scheme of the experiment. To identify the errors of the methods used, we carried out numerical simulations of the measurement of the specular reflection coefficient of the sample under test by the method of integral equations (method of moments) in the FEKO program in the formulation of two experimental schemes. The obtained results were compared with each other and with the results of analytical calculations of the specular reflection coefficient carried out using the Fresnel formulas when considering an infinite flat layer of material. These calculations make it possible to compare the methodical errors in measuring the reflection coefficient in the two considered experimental schemes. It was shown that the results of the measurements using the corner reflector give methodical errors (deviations from the analytical calculation) by 1–2 dB more than the measurements on the bistatic facility. The results of experiments and numerical simulations are in agreement with each other. The conclusions obtained in this work are applicable to any experimental facilities for the study of planar materials.
About the Authors
R. V. Gilmutdinov
Moscow Institute of Physics and Technology
Russian Federation
Russian Federation
Ruslan V. Gilmutdinov
Dolgoprudny, Moscow Region
I. I. Krasnolobov
Institute of Theoretical and Applied Electrodynamics RAS
Russian Federation
Russian Federation
Igor I. Krasnolobov
Moscow
N. L. Menshikh
Moscow Institute of Physics and Technology;
Institute of Theoretical and Applied Electrodynamics RAS
Russian Federation
Russian Federation
Nikolay L. Menshikh
Dolgoprudny, Moscow Region;
Moscow
S. A. Fedorov
Institute of Theoretical and Applied Electrodynamics RAS
Russian Federation
Russian Federation
Sergey A. Fedorov
Moscow
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Review
For citations:
Gilmutdinov R.V., Krasnolobov I.I., Menshikh N.L., Fedorov S.A. Methodical errors in measuring the specular reflection coefficient from a planar sample of material for two types of measuring facilities. Izmeritel`naya Tekhnika. 2021;(6):44-50. (In Russ.) https://doi.org/10.32446/0368-1025it.2021-6-44-50
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