Navegando por Assunto "Smart FSS (Frequency selective surfaces)"

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Acesso aberto (Open Access)
Superfície seletiva de frequências inteligente baseada em grafeno
(Universidade Federal do Pará, 2019-09-02) PAIVA, Rodrigo Rodrigues; OLIVEIRA, Rodrigo Melo e Silva de; http://lattes.cnpq.br/4768904697900863
In this work, a formulation based on the finite-difference time-domain (FDTD) and on the exponential matrix methods is developed for modeling thin graphene sheets. This formulation is validated by reproducing problems involving graphene frequency selective surfaces (FSS) known from literature. Then, we propose in this work a smart graphene FSS device. Smartness is obtained by means of a unity cell formed by a graphene ring with a graphene sheet placed in its aperture. By properly regulating the chemical potentials of the graphene elements, two frequency-tunable modus operandi are obtained: single- or dual-band rejection modes. When the device operates in its dual-band rejection mode, either of the rejection bands can be shifted individually in the frequency spectrum. Additionally, both rejection bands can also be reconfigured simultaneously. With the device operating in single-band rejection mode, it is also possible to shift its rejection band in the frequency spectrum.