Banca de DEFESA: EDWIN LUIZE FERREIRA BARRETO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : EDWIN LUIZE FERREIRA BARRETO
DATA : 18/11/2016
HORA: 09:00
LOCAL: Auditório do Centro de Tecnologia - Campus Central - Natal
TÍTULO:

Analysis of microstrip fractal multilevel antenna with CPW and ground plane 

partial removal for band-C and band-S applications

PALAVRAS-CHAVES:

fractal antennas, microwave circuits, CPW, axial ratio, band-C and band-S, wireless communication

PÁGINAS: 84
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
SUBÁREA: Telecomunicações
ESPECIALIDADE: Teoria Eletromagnetica, Microondas, Propagação de Ondas, Antenas
RESUMO:

This work has as main objective to make the design and analysis of different structures for planar microstrip antenna with partial removal of the ground plane with the use of fractal curves. Recently, studies show that some parameters, such as the shapes of the antenna patch and the ground plane when geometrically altered, producing changes in the distribution current density of the planar structure and therefore the resonant modes, the radiation characteristics and polarization antenna. This paper presents a novel fractal antenna using the technique of insertion fractal slots and defects in the ground plane and discontinuities ¼ transformer wave transmission line in order to increase the bandwidth and insertion in line power for three specific behaviors frequency band applications. We used the FR4 substrate with dimensions of 85.0 x 85.0 x 1.57 mm³. In addition, we used different modes of impedance matching in line antenna feed as CPW (Coplanar Wave Guide), to change the width of the transmission line in order to obtain a variation in the current distribution and hence the response bandwidth for impedance S11≤10 dB for C band (3.9 GHz - 6.2 GHz) and S band (2.0 GHz - 4.0 GHz). An analysis is performed for the antenna feed in cases of microstrip and CPW line when circularly polarized antenna is obtained. Good agreement was obtained between measured and simulated results. The fractal antenna microstrip proposal can be easily designed, built and is a strong candidate for use in mobile communication systems in bands C and S.

MEMBROS DA BANCA:
Presidente - 349732 - LAERCIO MARTINS DE MENDONCA
Interno - 6345784 - ADAILDO GOMES D ASSUNCAO
Externo ao Programa - 1422699 - HERTZ WILTON DE CASTRO LINS
Externo à Instituição - HUMBERTO DIONISIO DE ANDRADE - UFERSA
Externo à Instituição - MARCOS TAVARES DE MELO - UFPE