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12 May 2009 Metamaterial absorber with wide angular and frequency bandwidth
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The absorbers usually employed in everyday applications and the ultimate layouts recently proposed in the literature and based on unconventional material loading, are usually backed by a metallic plate. The metallic backing plays two main roles. On one hand, it is used to avoid power transmission on the other side of the absorber. On the other hand, it enables a boundary condition useful to create a reflected component that, combined with the impinging wave, cancels the reflection from the screen. In order to avoid a metallic backing, proper resonant structures may be employed. In this frame, it is possible to make use of metamaterials, that are artificial materials exhibiting properties not readily found in natural materials. The aim of the paper is to present a theoretical investigation relating to the design of compact microwave absorbers, made by a proper combination of two metamaterial slabs. The operation principle of that layout is based on the anomalous surface resonance, arising at the interface between two slabs, characterized by opposite signed values of the real parts of permittivities and/or permeabilities. We show that these bi-layers, when excited by an impinging electromagnetic wave, may support a localized interface resonance, whatever the total thickness of the entire setup is, for any angle of incidence, and no matter what the nature of the backing on the other side of the structure is. We also propose a new class of miniaturized inclusions, in order to be employed in practical layouts of innovative microwave absorbers.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alessandro Toscano and Lucio Vegni "Metamaterial absorber with wide angular and frequency bandwidth", Proc. SPIE 7353, Metamaterials IV, 735308 (12 May 2009);

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