Projeto e análise de sensores planares de microondas para caracterização dielétrica de materiais
The evolution of technology, making the measurement of the permittivity of a material increasingly important for antenna design. Thus, this work presents the design and development of three planar sensors (in microstrip technology) in microwave frequency ranges with the purpose of dielectric charact...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/52243 |
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| Resumo: | The evolution of technology, making the measurement of the permittivity of a material increasingly important for antenna design. Thus, this work presents the design and development of three planar sensors (in microstrip technology) in microwave frequency ranges with the purpose of dielectric characterization of materials. This work is exploratory research, because the measurements were made through experimental tests. The three antennas are built on Epoxy FR-4 substrate with a thickness of 1.57 mm and relative permittivity ( 4) of 4.4. The three antennas have their bio-inspired patch in the shape of the tulip plant, with antenna 1 formed by the standard patch and the other two antennas, patched with a CSRR (Complementary Split-ring Resonator) and IDC
(Interdigital Capacitor) resonator element. These insertions in the geometry of the patch antenna are made in order to increase the sensitivity of the sensor. The antennas are powered by a microstrip transmission line. The projects and simulations are carried out using the Ansoft HFSS software. In order to validate the project and investigate the
frequency behavior, antenna prototypes were built and measured. As samples of materials for characterization, in this work four different dielectric materials were used, namely RT/duroid, Epoxy FR-4, RO3006 and RO3010. In the measurements, the samples were positioned in the center and above the patch element of each proposed antenna. After setting up the experiment, measurements were made to determine the electrical permittivity of the samples based on the variation of the resonant frequency of the antenna in each case. The sensitivity of the standard sensor (without resonator element) was compared with a sensor based on CSRR resonators and an IDC. The results of the experiment showed that the measured sensitivity of the CSRR sensor is 1.3422 to 1.4416 times greater than the standard sensor for the four samples with dielectric permittivity ranging from 1 to 10.2. |
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