Navegando por Assunto "Antena de microfita"

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Implementação do phagrafeno no patch de uma antena de microfita
(Universidade Federal do Pará, 2023-08-25) CARDOSO, Darlan Holanda; SILVA, Shirsley Joany dos Santos; http://lattes.cnpq.br/6060351208361634; DEL NERO, Jordan; http://lattes.cnpq.br/5168545718455899
This research corresponds to the implementation of Phagraphene in the Patch of a microstrip antenna, from the perspectives analyzed of a graphene microstrip antenna. Phagraphene is a new allotrope of carbon and its structure distorts the Dirac cones, having binding characteristics and packing density compatible with that of graphene. In this work, the simulator used is the COMSOL multifiphsysics software, where it performs multiphysics modeling, in which to implement Phagraphene in the program library, it is necessary to have the optical properties, such as: electrical conductivity, relative permittivity and relative permeability. The SIESTA package was used to optimize the geometry and determine the optical properties from the Phagraphene unit cell. The results obtained from Phagraphene, compared with graphene, show that electronic and magnetic properties become useful for the microstrip antenna designer. In this way, two microstrip antennas were simulated: one with the patch made of Phagraphene and the other of graphene. In this way, two microstrip antennas were simulated: one with patch made of Phagraphene and another of graphene. The aim was to make a comparative term between them and ensure that Phagraphene is more stable in a THz band width. As the results obtained (of Return Loss, Impedance, VSWR and gain radiation diagram) of the Phagraphene antenna were satisfactory, three more simulations were carried out, varying their designer: (i) one with periodic structures, one with air holes (PBG Antenna), (ii) another with the addition of two Phagraphene Nanoribbons on the edges of the antenna patch (Nano Antenna), and finally, the last projected antenna (iii), the junction of the antennas (i) and (ii) called (PBG+Nano Antenna). Therefore, the use of these variations proved to be interesting for applications in this frequency range, as they obtained good results, opening up a range of applicabilit