Diseño y evaluación de superficies selectivas en frecuencia para etiquetas pasivas de RFID sin chip.

Abstract

In this work, the design and evaluation of Frequency Selective Surfaces for passive tags of Radio Frequency Identification Systems (RFID) without chip (chipless RFID) is carried out. For this purpose, the theoretical foundations of RFID systems, their characteristics and label classification are analyzed, with special emphasis on the study of labels that do not have a chip. The fundamentals of Frequency Selective Surfaces (FSS), its principle of operation and geometry are detailed, delving into loop-type FSS, especially those formed by concentric square loops. The design of three FSSs made up of concentric loops with different geometries operating in the microwave band between 2 and 8 GHz is described. The Ansoft HFSS program in version 15.0.2 is used to simulate the structures and perform its subsequent evaluation. The exploratory method is applied to analyze the existing situation, its characterization and practical utility of conventional RFID systems and the novel RFID systems without chip, with which the descriptive method is used to examine the data obtained and apply them for the purpose of this job. The Empirical-Analytical model is used with a Quantitative perspective through the application of mathematics to describe the processes tested in this investigation, and the elaboration of the schemes of the proposed arrangements. It is Experimental considering that the behavior of the designed structures is evaluated against variations in the thickness of the substrate and under the effect of the oblique incidence of the excitation wave..