“…In a number of scientific contributions, research is devoted to theoretically model the RFID signal propagation, aiming at predicting the tag detection by means of numerical results [5]. However, it is worth mentioning that, in some specific scenarios such as near-field systems, the ray model [2] typically used for long-range UHF RFID systems can not be applied, since the main requirements are not satisfied. Thus, more accurate models have been studied [5]- [7].…”