High Capacity Multiresonant Chipless RFID Sensor Tag For IoT Applications

A novel, high-density, miniature and compact chip- less RFID sensor tag is presented in this article. The proposed work comprises fourteen nested quatrefoil-shaped slot resonators for ID coding with the additional feature of printability and sensitivity. The geometrical configuration consists of several quatrefoil slots of various sizes distributed in a concentric pattern.The unique feature of the presented tag is exhibiting a humidity sensing feature with the deployment of silver nano-ink particle as a radiator by keeping the high code density of 21.8 bits/cm
²
in comparison with existing reported works. A bit coding sequence is observed in the frequency spectra from 5 GHz-24 GHz while maintaining a compact size of 8 mm× 8 mm. Further, the performance of the proposed tag is evaluated for numerous substrates, including Rogers RT/Duroid/5880, Taconic (TLX-8), F4BM and Kapton HN, allowing it to be employed in a variety of environments. Additionally, the realized tag structure possesses angular stability at various polarization angles up to 90
⁰
. This particular tag is deemed to be a suitable choice for future product identification and Internet of Things (IoT) systems.