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Radar Cross Section Reduction of a Cavity in the Ground Plane

Published online by Cambridge University Press:  03 June 2015

Gang Bao  and
Jun Lai
Gang Bao*
Affiliation:
Department of Mathematics, Zhejiang University, Hangzhou 310027, Zhejiang, China Department of Mathematics, Michigan State University, East Lansing, MI 48824, USA
Jun Lai*
Affiliation:
Department of Mathematics, Michigan State University, East Lansing, MI 48824, USA
*
Corresponding author.Email:bao@math.msu.edu
Email:laijun@msu.edu
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Abstract

This paper investigates the reduction of backscatter radar cross section (RCS) for a rectangular cavity embedded in the ground plane. The bottom of the cavity is coated by a thin, multilayered radar absorbing material (RAM) with possibly different permittivities. The objective is to minimize the backscatter RCS by the incidence of a plane wave over a single or a set of incident angles. By formulating the scattering problem as a Helmholtz equation with artificial boundary condition, the gradient with respect to the material permittivities is determined efficiently by the adjoint state method, which is integrated into a nonlinear optimization scheme. Numerical example shows the RCS may be significantly reduced.

Keywords

35Q9335J05Optimal designRCS reductionadjoint methodradar absorbing materials
Type
Research Article
Information
Communications in Computational Physics , Volume 15 , Issue 4 , April 2014 , pp. 895 - 910
Copyright
Copyright © Global Science Press Limited 2014

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