Characterization and Performance Analysis of a Chiral-Metamaterial Channel with Giant Optical Activity for Terahertz Communications
Résumé
Technology in the THz frequency band has progressed rapidly in the last a few
years. The THz frequency band offers greater communication bandwidth than at
microwaves frequencies, and is imposing for nano-scale communications. Indeed,
what makes THz waves interesting, is their possible applications because of their
specific features. Traditional channel models for lower frequencies do not take
into consideration specific properties as the very high molecular absorption or the
very high reflection loss. In a propagation medium exhibiting a Giant Optical Activity,
it is also important to derive the characteristics of the channel affected by
chirality effects. This phenomenon occurs in particular material so-called chiralmetamaterials
in (4–10) THz band.
The main contribution of this paper consist in the analysis of specific parameters
of a chiral-metamaterial, such as the relative electrical permittivity, magnetic permeability
and chirality coefficients. These parameters will be considered for the
channel model derivation both in Line-of-Sight and No Line-of-Sight propagation. The chiral effect affects the channel through the presence of spectral windows,
due to peaks of resonance of chiral parameter. Performance analysis of the
chirality-affected channel has been assessed in terms of (i) channel capacity, (ii)
propagation delay, (iii) coherence bandwidth, and (iv) symbol rates, for different
distances and propagation modes.
Domaines
Informatique
Origine : Fichiers produits par l'(les) auteur(s)
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