DocumentCode :
1382706
Title :
Multiband electromagnetic wave absorber based on reactive impedance ground planes
Author :
Costa, Francois ; Monorchio, Agostino
Author_Institution :
Dept. of Inf. Eng., Univ. of Pisa, Pisa, Italy
Volume :
4
Issue :
11
fYear :
2010
fDate :
11/1/2010 12:00:00 AM
Firstpage :
1720
Lastpage :
1727
Abstract :
A novel structure able to perform multi-band absorption is presented. As is well known, the most famous and simplest radar absorbing material is the Salisbury screen. Improved solutions, aimed at a thickness reduction, have been presented in the literature, conceptually based on metamaterials and employing properly designed high-impedance surfaces (HIS) in practice. The absorber presented here combines the working principles of the previously mentioned designs in order to join the two types of absorber into a single structure. The novel design comprises a single resistive sheet mounted at a fixed distance from a reactive surface. The latter is a composite layer of a frequency selective surface printed on a grounded dielectric slab acting as an artificial magnetic conductor at lower frequencies, while responding as a perfect electric conductor at higher frequencies. The distance of the resistive sheet can therefore be dimensioned so as to recover the Salisbury functions in the upper band, while operating as a λ/10 absorber in the low-frequency regime. The structure is explained by means of a simple circuital model and measured data are reported to verify the proposed concepts. It is finally shown that low-frequency resonance can be advantageously adjusted by introducing some active elements in the HIS.
Keywords :
electromagnetic wave absorption; frequency selective surfaces; radar absorbing materials; Salisbury screen; artificial magnetic conductor; frequency selective surface; grounded dielectric slab; high-impedance surfaces; metamaterials; multiband electromagnetic wave absorber; radar absorbing material; reactive impedance ground planes; single resistive sheet; thickness reduction;
fLanguage :
English
Journal_Title :
Microwaves, Antennas & Propagation, IET
Publisher :
iet
ISSN :
1751-8725
Type :
jour
DOI :
10.1049/iet-map.2009.0359
Filename :
5639169
Link To Document :
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