MORAIS, S. M. A.; MORAIS, SAMUEL M. A.; MORAIS, SAMUEL MEDEIROS ARAUJO.; http://lattes.cnpq.br/0177159951565661; MORAIS, Samuel Medeiros Araújo.
Résumé:
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.