Análise de estruturas planares para aplicações em sistemas de sensoriamento

Abstract

In this work, the analysis and development of planar structures are presented, for sensing applications. The proposed sensors consist of: A log-periodic antenna modeled using traditional methods, a bio-inspired antenna in the Shiso leaf, whose scientific name is Perilla Frutescens. A complementary interdigital capacitor (CIDC) is inserted into the geometry; A microstrip antenna with circular patch with a container printed in ABS filament, the resonant element is based on the structure of complementary split-ring resonator (CSRR). The working principle of the first sensor is based on the Niscolson Ross Weir -NRW method and the last two both devices are based on the displacement of the resonant frequencies of the elements when changing the relative permissiveness of the material under test (MUT). Several simulations are carried out, so that, with the data obtained, the NRW methods were used and two empirical models are proposed. For sensors based on the resonance method to validate their effectiveness, measurements were made with dielectric substrates that have dielectric constants known in the literature. The third sensor can be applied to different types of materials, in this work it will be used to determine the percentage of water contained in different types of soils. The prototypes were built and the results obtained in the measurements were compared with the results of other studies, thus validating the effectiveness of the proposed sensors.