A Depolarizing Chipless RFID Tag for Robust Detection and Its FCC Compliant UWB Reading System

TLDR

The paper proposes a chipless RFID tag that uses depolarization to simplify item detection in real environments. The tag employs multiple scatterers that depolarize the incident wave, enabling a response in orthogonal polarization and allowing a simplified calibration to enlarge the detection area. Experimental results demonstrate that the tag achieves higher detection rates on both dielectric and metal objects, and can reliably detect items of diverse sizes and materials.

Abstract

A new chipless RF identification (RFID) tag design is presented in this paper to ease the detection of items in a real environment. For this purpose, we present multiple scatterers able to depolarize the incident wave to create a response in the orthogonal polarization. Measurements in anechoic chamber and in a real environment, when the tags are positioned on dielectric and metal objects, show their higher detection capability. For the first time, a study on the technique to increase the detection area with a simplified calibration step is carried out. This makes possible the detection of the tag on objects of various sizes and compositions, which is required in the majority of RFID applications.