Sistema RFID flexível para detecção do movimento humano.

Abstract

With the popularization of the internet of things concept and the advances in low- power electronics, the radiofrequency identification technology has gained notoriety in research and development, with everyday applications ranging from entertainment to medicine, for example. This technology’s capacity of sensing highlights it as one of the main solutions in reducing cost and complexity in such applications. In this work, it is presented the development of a flexible tag, fabricated on an ethylene-propylene-diene monomer substrate and operating on the frequency of 915 MHz, for human body motion detection. The addition of metamaterial structures, known as complementary split ring resonators to the tag’s reflective plane, enhanced its gain and reading range up to 37% when compared to the previous tag without metamaterial. The simulations were performed in the ANSYS® Electronics Desktop software and the fabrication used an adhesive copper tape as conductive material. With the tags placed on the human body limbs, validation tests of the applicability in identifying body movements were carried out and, by comparing the variation of the power intensity signals received from the tag when it is static and in motion, it was possible to detect the movement realization.