Estudo da influência do tipo de elemento ressonante na sensibilidade de sensor planar

Abstract

Currently, sensing devices are developed to provide data with significant precision operating in support of various daily activities. In this work, a study of the influence of different resonant elements on the sensitivity of a planar sensor is presented. The sensor is based on a rectangular patch antenna, on which different types of resonant structures are inserted. The resonant structures were: interdigital capacitor (CID), complementary split-ring resonator (CSSR), the Rectangular Spiral and a square complementary split-ring resonator (SCSSR). The efficiency of the resonant structure in the sensitivity of the sensing device is evaluated from the displacement of the resonant frequency, caused by the interaction with a material under test (MUT). Using the finite element method, implemented by the Ansys HFSS software, simulations were carried out that allowed raising the response data for each element used. In addition, curves representing the frequency variation and sensitivity for each discrete MUT electrical permittivity value were obtained based on the specialized literature in the area. Finally, a comparative analysis of data based on arithmetic mean, standard deviation, variance and relative percentage difference. Thus, through the comparative analysis of the results, it was possible to identify that the resonant structure based on the CSRR presented a higher level of sensitivity compared to the other studied models.