Banca de QUALIFICAÇÃO: LUIS FELIPE DE VASCONCELOS TORRES DA COSTA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : LUIS FELIPE DE VASCONCELOS TORRES DA COSTA
DATE: 02/10/2020
TIME: 09:00
LOCAL: Sala virtual
TITLE:

Analysis of planar antennas with fractal geometry applied in the sensing of liquids and cracks in diverse structures

KEY WORDS:

Planar antennas; Fractal antennas; Microwave sensing.

PAGES: 20
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Telecomunicações
SPECIALTY: Teoria Eletromagnetica, Microondas, Propagação de Ondas, Antenas
SUMMARY:

Wireless communications systems have become increasingly popular lately due to the diversity of services that are offered, in addition to the related mobility and practicality. In these systems, antennas play a fundamental role, as they are devices responsible for transmitting and receiving electromagnetic signals. Planar circuits, such as microstrip antennas, have been shown to be useful in several applications, since they are light and compact and have low manufacturing cost, possibility to operate in different frequency ranges and easy integration with other communication circuits. Furthermore, there has been an increasing interest of researchers worldwide in the development of wireless sensors. In this context, planar antennas have been useful due to their characteristics and are becoming more widely used in several applications such as military, biomedical, environmental, civil engineering, industrial, for example. This thesis proposal aims to use a planar monopole with fractal geometry, which operates in broadband, applied in the sensing for the characterization/detection of liquids, as well as in the detection of cracks in diverse structures, with applications in a frequency range from 900 MHz to 5GHz. The sensing in the proposed situations will be carried out observing the changes that will occur in the reflection coefficient of the antenna. In the case of liquid sensing, it is possible to observe the shift in the resonant frequency of the antenna, since there will be changes in its dielectric constant when it is in contact with the liquid. This makes it possible to characterize the liquid (e.g. salinity and pH levels), and to monitoring its presence in some medium as well. In the case of crack detection, the resonance frequency of the antenna will change according to the size and extent of the crack. This analysis is useful not only for civil engineering (for monitoring the integrity of structures, for example) but also for applications in the biomedical area (for monitoring cracks in bones, for example). The results will be presented from computer simulations carried out in Ansoft HFSS and measurements carried out with the fabricated prototypes.

BANKING MEMBERS:
Presidente - 6345784 - ADAILDO GOMES D ASSUNCAO
Interno - 3921178 - VALDEMIR PRAXEDES DA SILVA NETO
Externo ao Programa - 1422699 - HERTZ WILTON DE CASTRO LINS
Externo à Instituição - ADAILDO GOMES D ASSUNCAO JUNIOR - IFPB
Externo à Instituição - JOSE DE RIBAMAR SILVA OLIVEIRA - IFRN