Abstract
A novel and miniaturized semi-elliptical 20-bit fully passive chipless RFID sensor tag is proposed in this article. The realized sensor tag is made up of semi-elliptical shaped open-end slots within the compact size of 25 mm × 17 mm. The multi-substrate analysis of the proposed tag is examined using non-flexible and flexible materials. The articulated tag configuration is capable of monitoring moisture levels when the largest resonator is covered by a heat-resistant sheet of Kapton HN (DuPontTM). The proposed tag functions in the operational frequency band of 4.1 GHz-16 GHz and possesses the overall bit density of 4.70 bit/cm2. The structure is composed of a thin passive substrate layer topped with an active layer of conductive path and is considered as a potential candidate for low-cost identification of the tagged objects. In addition to that, its moisture sensing property and flexible nature make it a reliable smart sensor for conformal applications.
Highlights
The internet of things (IoT) plays an incredible role in improving the quality of life by connecting millions of smart devices and technologies, and it serves modern-day applications in the fields of industrial automation, smart home, transportation, and healthcare [1]
Code density is a core factor which determines the compactness of a chipless tag, and it is estimated from certain parameters
We present a semi-elliptical shaped novel and flexible passive chipless RFID
Summary
The internet of things (IoT) plays an incredible role in improving the quality of life by connecting millions of smart devices and technologies, and it serves modern-day applications in the fields of industrial automation, smart home, transportation, and healthcare [1]. The building blocks of a chipless RFID system are comprised of a reader, transponder, and data base for extracting and storing information from the remotely located tag [4,5]. Multiple approaches have been studied for designing chipless RFID tags achieving large information storing capacity and reliable performance. Various resonant structures such as E-shaped, spiral, hairpin type, and C-shaped resonators have been investigated to improve the data encoding capacity of chipless tags [6,7,8,9,10]. A trade-off exists between compactness and bit density of an RFID tag. Code density is a core factor which determines the compactness of a chipless tag, and it is estimated from certain parameters
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