"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 5, 2018

contents of issue      DOI  10.30898/1684-1719.2018.5.8       full text in Russian (pdf)  

Formulae for narrow groove's and through-thickness gap's radar cross section estimation

A. M. Lebedev, T. A. Furmanova, A. I. Fedorenko, I .I. Krasnolobov
Institute for Theoretical and Applied Electromagnetics of the Russian Academy of Sciences, Izhorskaya 13, Moscow 125412, Russia

 

 The paper is received on April 24, after correction - on May 22, 2018

 

Abstract.  The task of narrow straight slot backscattering intensity estimation has been solved. Here the slot is a groove or a through-thickness gap in locally flat surface of metal object. The slot's cross-section is supposed to be rectangular, while the width and the length of the slot are, correspondingly, much less and much more than wavelength. Most intensive scattering in the plane, perpendicular to the slot, has been estimated. The reasons for two-position and one-position scattering intensity constancy, while the direction of incidence is varying, have been found out. Simple formulae to estimate groove's and through-thickness gap's radar cross section have been obtained, using the one-mode approach and the equivalent surface currents technique for entering and exit (the latest in case of through-thickness gap) surfaces of the slot. The approach to numerically evaluate the admittance of external region, adjoining to the entry (and exit) surface of the slot, has been suggested. It has been shown that once found admittance of external region for a particular width of the slot can be used to evaluate scattering from the slot of the same width, but of any type (groove, through-thickness gap) and depth. One-mode approach with the accounting for the external region admittance results in high accuracy calculation of slot's backscattering, particularly in the vicinity of resonances in the groove, where its backscattering is the highest.

Key words: backscattering, long narrow slot, groove, through-thickness gap, formulae for radar cross section evaluation, one-mode approximation, external region admittance.

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For citation:
A. M. Lebedev, T. A. Furmanova, A. I. Fedorenko, I .I. Krasnolobov. Formulae for narrow groove's and through-thickness gap's radar cross section estimation. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 5. Available at http://jre.cplire.ru/jre/may18/8/text.pdf

DOI  10.30898/1684-1719.2018.5.8