Realistic Chipless RFID Tag Modeling, Mathematical Framework and 3D EM Simulation

Main objective of this work is to introduce a concrete modeling technique for chipless RFID tags based on 3D Bi-static Radar Cross Section (RCS) with the corresponding mathematical framework. This technique illustrates a systematic Electromagnetic (EM) simulation steps for fully presenting the 3D model of the chipless RFID tag in order to be integrated in the whole system as a part of the spatial channel. The introduced model of the chipless RFID tags considers several parameters of the complete system such as the polarization and the Angle of Arrival (AoA) of the incident excitation signal, the polarization and the Angle of Departure (AoD) of the back scattered signal, the orientation of the tag itself and furthermore the frequency response of the tag and its 3D spatial gain. This constructs concrete lines and solid base for real-world 3D channel modeling for enhancing the chipless RFID systems from the wireless communications point of view. Hence, it opens the door for chipless RFID systems to appear in several industrial applications and handling open challenging aspects such as multi-tag scenarios and localization. The 3D modeling technique is successfully applied for three different types of Frequency Coded (FC) chipless RFID tags considering the retransmission and the cross polarized ones and constructive EM simulation results are illustrated.

I. Introduction

Chipless Radio Frequency Identification (RFID) systems are going to replace the traditional optical barcoding technology at 2020 [1]. Ultra Wideband (UWB) Frequency Coded (FC) chipless RFID tags are considered to be a promising technology which provides a cost effective and low power identification solution [2]. They are compact, printable, no-chip and cheap [3].