Optimization of multilayer antireflection coatings using an optimal control method

Author

Pesque, J.J. ; Bouche, Daniel P. ; Mittra, Raj

Author_Institution

Centre d´´Etudes Sci. et Tech. d´´Aquitaine, Le Barp, France

Volume

40

Issue

9

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

1789

Lastpage

1796

Abstract

The design of a thin, lightweight, and broadband radar absorber is cast as a minimization problem of the reflection coefficient at the set of frequencies {f₁, f₂, . . ., f_n} and the thickness (or surface mass) of the absorber. The authors attempt to synthesize an absorber with an undefined number of layers and assume they have the freedom to choose the permittivity and the permeability of the material in each layer from a set of specified values. A design procedure based on an optimal control method that simultaneously determines both the material properties of the different layers as well as their thicknesses, to minimize at the same time the reflection coefficient over a prescribed range of frequencies and surface mass or thickness is presented. Illustrative examples of multilayer absorbers synthesized with this method are presented, and the results are compared with those using simulated annealing

Keywords

antireflection coatings; electromagnetic wave absorption; minimisation; optimal control; radar cross-sections; AR coatings; RCS-reduction; broadband radar absorber; design procedure; layer thickness; material properties; minimization problem; multilayer absorbers; multilayer antireflection coatings; optimal control method; permeability; permittivity; reflection coefficient; surface mass; Coatings; Frequency; Material properties; Nonhomogeneous media; Optical reflection; Optimal control; Permeability; Permittivity; Radar; Simulated annealing;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.156606

Filename

156606