A novel H-shaped cavity based RFID chipless tag

Abstract

A novel, frequency selective surface (FSS) based, data encoding structure amenable to be used as a chipless RFID tag is proposed. The data encoding structure is made up of finite repetitions of a unit cell fabricated on commercially available grounded FR4 substrate having physical dimensions of 15 × 15 mm 2. The unit cell is composed of numerous T-shaped resonant elements arranged as two atypical sets of concentric nested loops. Alteration in geometry of the encoding circuit, attained by inclusion or omission of nested resonators, corresponds to a particular data sequence. Each encoded data sequence is manifested in the frequency domain as a distinct spectral signature. The proposed 10-bit tag is both compact and robust, and remains interrogable in response to illuminating electromagnetic waves at various angles of incidence.

Data-Dense and Miniature Chipless Moisture Sensor RFID Tag for Internet of Things

“…It begins with the concept stage and concludes at the development stage meeting the desired criteria of enhancing the bit density of a cost-effective tag. The presented semi-elliptical shaped chipless sensor tag produces more desirable results as compared to the reported designs in literature [6][7][8][9][10]. The construction of single slotted resonant element begins with the elliptical-shaped structure using moldable Rogers RT/duroid/5880 material, where the overall tag area is determined by two geometric parameters which are labelled as M a and M b .…”

“…In the literature, 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]. Nevertheless, a trade-off exists between compactness and bit density of an RFID tag.…”

Development of a novel radio frequency identification chipless tag with multifrequency response

“…The first is composed of three associated elements, namely the transmitter antenna, the N resonator, and the receiver antenna . The second is characterized by a more reduced size and consists of two associated elements, namely the Tx/Rx antenna associated to the encoding area . As for the third, it is simply one element, which receives the interrogation signal, generates the identifier (ID) depending on its particular shape, and then backscatters it to the reader.…”

Elliptical slot based polarization insensitive compact and flexible chipless RFID tag

“…The Flexible square shaped orientation insensitive tag, triangular shaped cascaded resonators, and H‐shaped chipless tag for IoT based applications are also reported . The FD analysis of open‐loop resonator on a flexible substrate and spiral resonator in a small size are demonstrated in References . Achieving compactness with maximum bit density and quality performance is still an issue to be addressed in designing RFID tags.…”