Banca de DEFESA: TIAGO DOS SANTOS BEZERRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : TIAGO DOS SANTOS BEZERRA
DATE: 06/11/2020
TIME: 14:00
LOCAL: https://meet.google.com/ars-bdhm-gxf
TITLE:

Application of EBG (Electromagnetic BandGap) on Frequency Selective Surfaces to Suppress Higher Order Modes

KEY WORDS:

FSS, EBG, Genetic Algorithm, Optimization, and Brillouin Diagram

PAGES: 68
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Telecomunicações
SPECIALTY: Teoria Eletromagnetica, Microondas, Propagação de Ondas, Antenas
SUMMARY:

We propose an application of electromagnetic bandgap (EBG) for suppression or reduction of higher order resonant modes in frequency selective surfaces (FSS), not yet studied in the literature.

            The study consists of an application of a rectangular periodic array of circular air holes in FSS dielectric substrate to create rejection bands and to suppress or reduce specific resonant frequency modes. Another type of unconventional air hole used was the square shaped holes, aiming to reduce the computational effort during the simulations.

            Optimizations with genetic algorithms were implemented to optimize the physical parameters of the holes, aiming at the suppression in the desired frequency range.

            In order to prove that the prohibited bands occurred in the desired frequency bands, a Brillouin dispersion diagram was constructed verifying that the structures acted as EBG

Seven prototypes were manufactured and the results measured compared to the simulated results obtained in ANSYS HFSS. A good agreement between the results is observed. Simulations and measurements show suppression levels of up to 6 dB. The simulation time of the FSS with EBG of square holes showed a reduction of 70% in relation to the simulation time of the FSS with EBG of cylindrical holes.

BANKING MEMBERS:
Interno - 2524053 - ANTONIO LUIZ PEREIRA DE SIQUEIRA CAMPOS
Interno - 1422265 - JOSE PATROCINIO DA SILVA
Interno - 349732 - LAERCIO MARTINS DE MENDONCA
Externo à Instituição - ERICO CADINELI BRAZ - IFRN
Externo à Instituição - MAURICIO WEBER BENJÓ DA SILVA - UFF