Concepção de antena de polarização circular para aplicações em sistemas de identificação por radiofrequência.

Abstract

The radiofrequency identification (RFID) technology is very popular in commercial applications and it is experiencing an evolution with the insertion of Internet of Things concepts into its existing systems. So, the need for more efficient and more robust elements for corresponding to those new demands is increasing. One of the main concerns in the RFID systems is the correct identification of the tags in applications where it isn’t possible to predict the alignment between the tags and the antennas. With the purpose of avoiding this kind of situation, the circular polarized antennas are suggested as a reliable option. In this context, this work presents the design of a low-cost circular polarized antenna for RFID systems operation in the American UHF frequency of 915MHz. Initially, it’s was made a study of antenna theory and then it was proposed a design, which was manufactured using FR4 as the substrate. The antenna produced was then tested and its performance was validated both in relation to the results obtained in simulation as in comparison to those obtained for a commercial antenna.