Ultimate thickness to bandwidth ratio of radar absorbers

Author

Rozanov, Konstantin N.

Author_Institution

Inst. for Theor. & Appl. Electromagn., Acad. of Sci., Moscow, Russia

Volume

48

Issue

8

fYear

2000

fDate

8/1/2000 12:00:00 AM

Firstpage

1230

Lastpage

1234

Abstract

Analytic properties of the reflection coefficient of a multilayer metal-backed slab are considered. The result is a new form of the dispersion relationship, which characterizes the integral of the reflectance over wavelength in terms of the total thickness and averaged static permeability of the slab. The relation may be transformed to an inequality, which produces the least thickness to bandwidth ratio achievable for a physically realizable radar absorber. The particular cases of broad-band and narrow-band absorbers are discussed. The least thickness of a 10-dB broad-band dielectric radar absorber is shown to be 1/17 of the largest operating wavelength. The discussion also involves the results of a numerical study.

Keywords

dispersion (wave); electromagnetic wave absorption; electromagnetic wave reflection; inhomogeneous media; integral equations; microwave materials; permeability; radar theory; averaged static permeability; broad-band absorbers; broadband dielectric radar absorber; dispersion relationship; integral equation; least thickness to bandwidth ratio; microwave absorbers; multilayer metal-backed slab; narrow-band absorbers; reflectance; reflection coefficient; total thickness; wavelength; Bandwidth; Dielectrics; Dispersion; Narrowband; Nonhomogeneous media; Permeability; Radar; Reflection; Reflectivity; Slabs;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.884491

Filename

884491