Abstract
This paper presents a thorough study of the behaviour of microwave absorption occurring in lossy dielectric slabs as used for microwave absorbers. The influence of the various parameters governing absorption is demonstrated : dielectric constant, conductivity, thickness of slab and frequency. It is shown that for several combinations of values for these parameters absorption can be maximized to up to unity, i.e. all the incident power is absorbed.
Highlights
The reduction of electromagnetic pollution and electromagnetic interferences is a major technological issue considering the widespread use of wireless applications
Radar absorbing materials are made of thick foam designed for wideband absorption. []Alternatively, thin multilayered coatings can be used but with operation on a narrow frequency band, except when carbon nanotube nanocomposites are considered [2,3,4] .Another approach consists in Frequency-Selective Surfaces (FSS) that enable to achieve nearly perfect absorption, in a narrow frequency band since planar resonators are used to achieve absorption at resonance [5,6].A further development combines FFS structures with nanocomposite lossy slabs [7]
The following subsections present the calculation of absorption for several pairs of parameters combining conductivity dielectric constant r, thickness d of slab d and frequency
Summary
The reduction of electromagnetic pollution and electromagnetic interferences is a major technological issue considering the widespread use of wireless applications. One example is radar stealth, which consists in reducing the detectability of a target by cancelling reflection of a radar incident to the surface. []Alternatively, thin multilayered coatings can be used but with operation on a narrow frequency band, except when carbon nanotube nanocomposites are considered [2,3,4] .Another approach consists in Frequency-Selective Surfaces (FSS) that enable to achieve nearly perfect absorption, in a narrow frequency band since planar resonators are used to achieve absorption at resonance [5,6].A further development combines FFS structures with nanocomposite lossy slabs [7]. In this paper we perform a thorough study of the absorption performances of conductive slabs applicable for example to nanocomposite polymer slabs including carbon nanotubes [2,3,4]. The influence of electrical parameters of the slab, of its-thickness and of the frequency is investigated and explained
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