Zhurnal Radioelektroniki - Journal of Radio Electronics. eISSN 1684-1719. 2020. No. 10
Contents

Full text in Russian (pdf)

Russian page

 

DOI  https://doi.org/10.30898/1684-1719.2020.10.6

UDC 537.874.2

 

Edge effects in bistatic measurements of scattering characteristics of material samples

 

 R. V. Gilmutdinov 1, N. L. Menshikh 1,2, S. A. Fedorov 1,2

 1 Moscow Institute of Physics and Technology (National Research University), Institutsky per. 9, Dolgoprudny, Moscow Region 141700, Russia

 2 Institute of Theoretical and Applied Electrodynamics of the Russian Academy of Sciences, Izhorskaya str., 13, Moscow 125412, Russia


The paper is received on October 7, 2020

 

Abstract. This work is devoted to studying errors emerging by the edge effects when measuring the reflection coefficient (R) and when finding Brewster angle. The impact of edge effects on the scattering characteristics of planar material samples with different geometries was considered. The method of moments in the FEKO program and analytical calculations using Fresnel formulas are used to study a model material with frequency-independent parameters of the medium. A plane linearly polarized wave falling on the object was studied. For each incidence angle of the wave, the electromagnetic field reflected from the object in the mirror direction was calculated. To calibrate the received signal a reference metal plate of the same size as the size of sample under study was used. To estimate the contribution of the finite-size of the sample in the of reflection coefficient, the simulation results were compared with analytical calculations using Fresnel formulas. The results of the electrodynamic simulation of the characteristics of the model material showed that the position of the sample relative to the polarization of the incident wave does not affect the R value; an increase in Brewster angle depending on the frequency was observed. The reflection coefficient of a square sample with a radar absorbent material (RAM) on a metal substrate was investigated. Measurements of the sample scattering characteristics were carried out in an indoor electromagnetic test bistatic facility (anechoic chamber) in ITAE RAS. The experimental results are in accordance with the calculated data obtained by the method of moments and analytical data. For the sample under study, the value of Brewster angle was not determined due to the fact that this value is outside the measurement range. A significant influence of edge effects on the reflection coefficient of the material sample was revealed, especially for angles closed to Brewster angle.

Key words: bistatic measurements, edge effects, reflection coefficient, method of moments, FEKO, anechoic chamber.

References

1. Bezoušek P., Schejbal V. Bistatic and multistatic radar systems. Radio Engineering. 2008. Vol.17. No.3.

2.  Gurel L., Bagci H., Castelli J. C., Cheraly A. and Tardivel F. Validation through comparison: measurement and calculation of the bistatic radar cross section of a stealth target. Radio Science. 2003. Vol.38, No.3.

3. Pienaar M., Odendaal J.W., Joubert J., Cilliers J. E., Smit J.C. Active calibration target for bistatic radar cross-section measurements.  Radio Science. 2016. Vol.51. P.515-523. https://doi.org/10.1002/2015RS005931.

4. Potgieter M., Odendaal J.W., Blaauw C., Joubert J. Bistatic RCS measurements of large targets in a compact range.  IEEE Trans. on Antennas and Propagation. 2019. Vol.67. No.4. P.2847.

5. Zeng J., Chen K.-S., Bi H., Zhao T., Yang X.A. Comprehensive analysis of rough soil surface scattering and emission predicted by AIEM with comparison to numerical simulations and experimental measurements. IEEE Trans. on Geoscience and Remote Sensing. 2017. Vol.55. No.3.

6. Eyraud C., Geffrin J.-M., Sabouroux P., Chaumet P.C., Tortel H.,          Giovannini H., Litman A. Validation of a 3D bistatic microwave scattering measurement setup.  Radio Science. 2008. Vol.43. P.4018. 2008.

7. Röding M., Sommerkorn G., Häfner S., Ihlow A., Jovanoska S., Thomä R. S.     A double-arch positioner for bistatic RCS measurements with four degrees of freedom.  Proc. of the 47th European Microwave conf. Oct. 2017.

8. Saleh H., Geffrin J.-M., Tortel H. Bistatic scattering measurement on low permittivity spheroidal objects.  2017 11th European Conference on Antennas and Propagation (EUCAP). Paris. 2017. P.259-262.

9. Saleh H., Geffrin J.-M., Eyraud Ñ., Tortel H. Upgrading the settings of a microwave experimental setup for better accuracy in bistatic radar cross section measurement.   2017 Mediterranean Microwave Symposium (MMS).

10. Umari M.H., Ghodgaonkar D.K., Varadan V.V., Varadan V.K. A free-space bistatic calibration technique for the measurement of parallel and perpendicular reflection coefficients of planar samples. IEEE Transactions on Instrumentation and Measurement. 1991. Vol.40. No.1. P.19-24.

11. Masaki T., Ishii Y., Michishita N., Morishita H., Hada H. Monostatic and bistatic RCS measurements for thin metasurfaces.  Proceedings of 2017 IEEE CAMA, Tsukuba, Japan.

12. Álvarez H.F., de Cos M.E., Las-Heras F. Monostatic and bistatic measurements of metasurfaces on anechoic chamber and a comparison with electromagnetic simulations.  13th European Conference on Antennas and Propagation EuCAP 2019.

13. Lebedev A.M., Obukhov M.I., Selin I.A., Furmanova T.A.  Regularities of bistatic scattering from metal triangle. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2019. No. 12. https://doi.org/10.30898/1684-1719.2019.12.15 (In Russian)

14. Knott E.F., Shaeffer J.F., Tuley M.T. Radar cross section. Boston: SciTech Publishing. 1993. 477 p.

15. Fedorov S.A., Menshikh N.L., Solosin V.S. Stand for measuring bistatic scattering parameters of small objects. XI All-Russian scientific and technical conference "Metrologiya v radioelektronike" [Metrology in radio electronics]. Mendeleevo, Moscow region, June 19-21, 2018 (In Russian)

16. Fedorov S.A., Menshikh N.L. Measuring complex for determining the parameters of two-position scattering of EMW.  VI Microwave conference. Moscow, November 27-29, 2018. (In Russian)

17. Brekhovskikh L.M. Volny v sloistykh sredakh [Waves in layered media]. Moscow, Nauka Publ. 1973. 503 p. (In Russian)

18. Ivanova V.I., Kibets S.G. Krasnolobov I.I., Lagarkov A.N., Politiko A.A., Semenenko V.N., Chistyaev V.A. Development of broadband radar absorbing material possessing high-level operating performance. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2016. No.7. URL:

http://jre.cplire.ru/jre/jul16/5/text.pdf (In Russian)

19. Semenenko V.N., Chistyaev V.A., Politiko A.A., Baskov K.M. Stand for measuring in free space the radiophysical parameters of materials in an ultra-wide band of ultra-high frequencies.  Izmeritelnaya tekhnika – Measuring Equipment. 2019. No. 2. (In Russian)

 

 

For citation:

Gilmutdinov R.V., Menshikh N.L., Fedorov S.A. Edge effects in bistatic measurements of scattering characteristics of material samples. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2020. No.10. https://doi.org/10.30898/1684-1719.2020.10.6 (In Russian)