A polarization-/angle-insensitive, bandwidth-optimized, metamaterial absorber in the microwave regime

An enhanced metamaterial absorber based on the circumscribed-cross resonator is introduced in this paper. The new structure is polarization-independent, due to the symmetry of its unit cell, and is proven efficient for the attenuation of obliquely incident waves. The absorption mechanism is thorough...

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Published inApplied physics. A, Materials science & processing Vol. 109; no. 4; pp. 1065 - 1070
Main Authors Dimitriadis, Alexandros, Kantartzis, Nikolaos, Tsiboukis, Theodoros
Format Journal Article Conference Proceeding
LanguageEnglish
Published Berlin/Heidelberg Springer-Verlag 01.12.2012
Springer
Subjects
Characterization and Evaluation of Materials
Condensed Matter Physics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Machines
Manufacturing
Nanotechnology
Optical and Electronic Materials
Optical materials
Optics
Physics
Physics and Astronomy
Processes
Surfaces and Interfaces
Thin Films
Frequency Domain Solver
Obliquely Incident Wave
Metamaterial Absorber
Perfectly Electric Conductor
Operational Bandwidth
Optical polarization
Electromagnetic wave absorption
Microwave radiation
Dielectric materials
Absorbers
Optical materials
Cavity resonators
Metamaterial
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Summary:An enhanced metamaterial absorber based on the circumscribed-cross resonator is introduced in this paper. The new structure is polarization-independent, due to the symmetry of its unit cell, and is proven efficient for the attenuation of obliquely incident waves. The absorption mechanism is thoroughly investigated and is found to be mainly related to the losses of the dielectric substrate. Furthermore, by exploiting the scalability property of metamaterials, the operational bandwidth of our design can be drastically improved by placing unit cells with properly scaled resonators adjacent to each other. In this context, various combinations of three, four, and nine unit cells that can increase the full width at half maximum up to as much as 11.18 %, are developed. The overall performance of the proposed configurations is deemed promising for the realization of microwave metamaterial absorbers for several practical applications.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-012-7385-5