Banca de DEFESA: JURGEN KLINSMANN AZEVEDO NOGUEIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JURGEN KLINSMANN AZEVEDO NOGUEIRA
DATE: 30/01/2025
TIME: 09:00
LOCAL: Sala digital
TITLE:

New Planar Sensor Geometries for Non-Destructive Characterization of Magneto-Dielectric Materials in Microwaves

KEY WORDS:

Planar Sensor; CSRR; Complex Permittivity; Permeability; Sensitivity.

PAGES: 82
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Telecomunicações
SPECIALTY: Teoria Eletromagnetica, Microondas, Propagação de Ondas, Antenas
SUMMARY:

This work presents the design and fabrication of two new configurations of planar microstrip devices for sensing applications and to characterize non-destructively the complex permittivity of magneto-dielectric materials. Planar microwave sensors have demonstrated important functionalities in several applications, such as in the food, industrial and biomedical sectors. Microwave sensors have the advantages of low cost and ease of fabrication, in addition to the possibility of integration with other devices. The first proposed sensor is based on a two-port planar microstrip device with the insertion of a Complementary Split Ring Resonator (CSRR) in its patch, this element is responsible for determining the electrical properties of the materials under test (MUT). Two samples of materials widely known in the literature were investigated. With this first sensor it was possible to obtain the complex permittivity of two solid materials. The second proposed sensor is based on a DGS bioinspired microstrip planar antenna, with the aim of characterizing, also in a non-destructive way, the magneto-dielectric characteristics, i.e., the electrical permittivity and permeability, of nine solid materials also known in the literature, using the same resonator for both characterizations. The proposed sensor has a patch bioinspired by the Spondias Tuberosa leaf, and a CSRR was inserted in the center of the ground plane, responsible for the permittivity characterization. The permeability is found through slits positioned close to the CSRR. In this work, the sensitivities of the two proposed sensors were also analyzed, presenting excellent results. The sensors were analyzed through simulations in the commercial software ANSYS HFSS. The prototypes were manufactured using FR-4 dielectric, which has relative electrical permittivity of 4.4, loss constant of 0.02 and thickness of 1.57mm, and the measurements were made using the E5071C vector network analyzer (VNA) on nine different samples (MUT) of dielectric and magnetic materials. The simulated and measured results were discussed and compared with values found in the literature, showing good agreement.

COMMITTEE MEMBERS:
Presidente - 6345784 - ADAILDO GOMES D ASSUNCAO
Interno - 349732 - LAERCIO MARTINS DE MENDONCA
Interno - 3921178 - VALDEMIR PRAXEDES DA SILVA NETO
Externo ao Programa - 338292 - JOAO BOSCO LUCENA DE OLIVEIRA - UFRNExterno à Instituição - CLÁUDIO PEREIRA DA COSTA - UPE
Externo à Instituição - JOABSON NOGUEIRA DE CARVALHO - IFPB