Etiquetas RFID sem chip aplicadas ao monitoramento da umidade relativa do ar.

Abstract

With the development and expansion of the internet of things, simple and effective methods are needed to detect informations from the environment. In order to meet these needs, chipless RFID tags are emerging as low cost and wireless alternatives to monitor physical characteristics. In this work are presented chipless RFID tags for monitoring the relative humidity of air. The proposed label, in addition to the low cost of production and the dispensable need of wire, presents coding and identification simplicity. Simulations of the tags transmission coefficient (S12) were performed. Considering the fact that the frequency response of the label varies by electrical parameters changes on it, it is possible to verify how the relative humidity of air modifies this response. Thereby, the verified variations of frequency response and the phenomenon under study are associated, and an evaluation showing how much the label is sensitive to the humidity of environmen is performed.