Banca de QUALIFICAÇÃO: LUIS FELIPE DE VASCONCELOS TORRES DA COSTA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUIS FELIPE DE VASCONCELOS TORRES DA COSTA
DATA : 14/11/2017
HORA: 09:30
LOCAL: Auditório do DCO
TÍTULO:

ANALYSIS OF CPW AND CPS ANTENNAS WITH FRACTAL GEOMETRIES FOR WIRELESS COMMUNICATIONS SYSTEMS

PALAVRAS-CHAVES:

CPW antenna, CPS antenna, fractal antennas, compact antennas, wireless communications

PÁGINAS: 40
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
SUBÁREA: Telecomunicações
ESPECIALIDADE: Teoria Eletromagnetica, Microondas, Propagação de Ondas, Antenas
RESUMO:

The rapid advance of technology and wireless communication systems has enabled the user, increasingly, to use different applications. This has attracted great interest among microwave researchers, who work in mobile communications, short-haul links, wireless local area networks (WLAN) and communications to satellites, for example. As a result, many researchers around the world are increasingly seeking to improve this technology to develop devices and equipment that can operate in multiple communication services that are light and compact and inexpensive.

In this context, the development of planar microwave antennas appears as an attractive alternative, due to its intrinsic properties such as small volume, reduced weight, low cost and ease of manufacture, besides allowing operating with different characteristics of radiation and polarization. Typically, planar microwave antennas are developed in microstrip lines and typically have narrow bandwidth and are typically designed to operate in a frequency range.

Recently, there has been a growing interest in the development of planar antennas in other planar transmission lines, among which are the coplanar waveguide (CPW) and the coplanar strips (CPS). CPW antennas have larger bandwidths than microstrip antennas and are suitable for the development of broadband antennas. CPS antennas can be used in both microwaves and millimeter waves.

On the other hand, the fractal geometries, when used in planar antenna designs, allow the reduction of size and show the multiband behavior. In comparison with conventional planar antennas, the antennas with fractal geometries present lower resonance frequencies, allowing the manufacture of more compact antennas.

The main objective of this work is the simulation of CPW and CPS structures for the design of CPW and CPS antennas with fractal elements for operation in the 1 GHz to 14 GHz band, aiming at applications in multiband, wide band and ultra wideband (UWB). In addition, the characteristics of radiation, gain and polarization of the antennas are observed. Computational simulations are performed and several configurations of CPW and CPS antennas are designed, using Ansoft HFSS software. For purposes of comparison with the simulated results, several prototypes of CPW and CPS antennas are manufactured and measured. The experimental results show a good agreement with the simulation results.

MEMBROS DA BANCA:
Presidente - 6345784 - ADAILDO GOMES D ASSUNCAO
Externo à Instituição - ADAILDO GOMES D ASSUNCAO JUNIOR - IFPB
Externo ao Programa - 1422699 - HERTZ WILTON DE CASTRO LINS
Interno - 349732 - LAERCIO MARTINS DE MENDONCA