Metasurface-Based Method for Broadband RCS Reduction of Dihedral Corner Reflectors With Multiple Bounces

A broadband technique to reduce the radar cross section (RCS) of complex targets is presented. In such targets, multiple-bounce mechanism dominates their RCS. The proposed technique demonstrates that by treating the multiple-bounce mechanism as a cascaded phenomenon, the problem then simplifies to i...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2020-03, Vol.68 (3), p.1436-1447
Main Authors: Modi, Anuj Y., Alyahya, Meshaal A., Balanis, Constantine A., Birtcher, Craig R.
Format: Article
Language:English
Subjects:
Antennas
Array theory
artificial magnetic conductor (AMC)
Broadband
checkerboard metasurface
complex targets
Conductors
Diffraction
dihedral corners
Finite element analysis
Gratings
Guidelines
high-frequency asymptotic methods
Metasurfaces
Orthogonal functions
orthogonality principles
phase-gradient metasurface
physical optics (PO)
radar cross section (RCS)
Radar cross sections
RCS reduction
Reduction
Reflectors
Scattering
scattering cancellation
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Summary:A broadband technique to reduce the radar cross section (RCS) of complex targets is presented. In such targets, multiple-bounce mechanism dominates their RCS. The proposed technique demonstrates that by treating the multiple-bounce mechanism as a cascaded phenomenon, the problem then simplifies to identifying and implementing a set of orthogonal functions. Robust guidelines for avoiding grating lobes are provided using array theory. The 90° dihedral corner is used to verify the proposed technique. Measurements are reported for a fabricated prototype with artificial magnetic conductor (AMC) technology where a 70% RCS-reduction bandwidth is observed. To generalize the method, a 45° dihedral corner, with quadruple-bounce mechanism, is considered. Generalized guidelines are summarized and applied to reduce the RCS of complex targets using the proposed method.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2019.2940494