Novel T-shaped resonator based chipless RFID 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.

Transient Response & Electromagnetic Behaviour of Flexible Bow-Tie Shaped Chip-less RFID Tag for General IoT Applications

“…Another reason to opt this design is the fact that it provides more flexibility in designing at higher frequencies unlike octagonal [26], square [28], circular [29] and triangular [30] designs. Moreover, in Bowtie chipless RFID tag the asymmetrical shape of the tag in which the distance between the resonators is not constant, it diminished the mutual coupling as compared to the symmetrical surfaces, placed very close to each other [31]. In this paper, a 4-bit Bow-tie chipless RFID tag is proposed and the transient behaviour of the tag is presented.…”

Novel QR-incorporated chipless RFID tag

“…The specifications necessitate design of an electromagnetic resonant circuit that readily fits a 15:5 Â 15:5 mm 2 square-shaped region in the middle of the QR-code, and encodes an arbitrary bit sequence in the spectral domain. Inspiration is drawn from recent work on multi-resonant chipless RFID tags [3,4,5]. The resonant circuits reported therein are composed of several resonant elements patterned in a concentric fashion on appropriately-sized grounded substrate.…”

“…Chipless variants of radio frequency identification (RFID) tags have received considerable research interest in recent past [2,3,4,5]. Both time domain [2] and frequency domain-based chipless RFID tags have been designed, with the latter encoding data in spectral domain and offering advantages such as ease of manufacturing, polarization insensitivity and design compactness [3,4,5]. QR codes and RFID tags, when unified, can act as an effective security contraption offering multi-layer authentication.…”

Novel Butterfly Slot Based Chipless RFID Tag

“…SAW principally converts the electromagnetic waves into many slower acoustic components and makes use of piezoelectric components. SAW tags are time domain based tags having relatively low data capacity [13] and involve a complex sub-micron lithographic process for manufacturing [15]. Another proposed timedomain RFID tag is the transmission delay line tag [16] that works on the principle of producing time delay in the received signal through an inductor-capacitor (LC) transmission line elements.…”

“…Although RCS based chipless RFID tags offer low-cost solution for mass production, enhancement of bit capacity and density are constrained due to multiple reasons, such as: limited operating frequency band [22], inter-resonator coupling [15], [21], and presence of higher order harmonics [23]. Although recently proposed RCS based chipless RFID tags [15,20,24] are compact having low production cost, spectral efficiency has not been taken into consideration. Operating over a wide band at higher frequencies requires advanced reading system, resulting in higher reader setup cost.…”