Banca de DEFESA: AUGUSTO CESAR PEREIRA DA SILVA MONTALVAO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : AUGUSTO CESAR PEREIRA DA SILVA MONTALVAO
DATA : 04/07/2016
HORA: 14:00
LOCAL: Sala de reuniões do PPgEEC
TÍTULO:

Study of Linear-Circular Polarization COnversion of Dual-Band Antennas for Portable RFID Readers Using Miniaturized Metasurfaces

PALAVRAS-CHAVES:

antenna, RFID reader, metasurfaces, polarization conversion, axial ratio.

PÁGINAS: 191
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
SUBÁREA: Telecomunicações
ESPECIALIDADE: Teoria Eletromagnetica, Microondas, Propagação de Ondas, Antenas
RESUMO:

This work aims to propose a new structure able to convert signals linearly polarized generated by a microstrip antenna for circularly polarized signals at two operating bands (2.45 GHz and 5.8 GHz), for use in portable RFID readers, using two miniaturized metasurfaces. In order to study the behavior of the proposed structure, three different layouts are used. First initial simulation tests are made, using the first metasurface coupled to the antenna. Then, the antenna is tested coupled to the second metasurface. Posteriorly the antenna is coupled to the two metasurfaces. The structures are analyzed numerically through Ansoft HFSS™, and to validate these results, the structures are characterized experimentally. The characteristics of transmissions simulated and measures are presented. A good agreement between simulated and measured results was obtained. The structure proposed here has the advantage to meet desired characteristics in two bands of interest, obtaining excellent values of return loss wideband, as well as the axial ratio, being a simple structure to be constructed and with low cost.

MEMBROS DA BANCA:
Externo à Instituição - ALFREDO GOMES NETO - IFPB
Presidente - 2524053 - ANTONIO LUIZ PEREIRA DE SIQUEIRA CAMPOS
Interno - 347063 - HUMBERTO CESAR CHAVES FERNANDES
Externo à Instituição - JEFFERSON COSTA E SILVA - IFPB
Externo ao Programa - 1840342 - MARCIO EDUARDO DA COSTA RODRIGUES