Near-field chipless RFID encoders with sequential bit reading and high data capacity

Herrojo, Cristian; Mata-Contreras, Javier; Paredes, Ferran; Martín, Ferran

doi:10.1109/mwsym.2017.8058928

Cited by 32 publications

(42 citation statements)

References 9 publications

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“…Concerning the tags, they are based on the resonant elements used in [50,51], i.e., S-SRRs [52][53][54]. However, a double chain of S-SRRs is considered in this paper, with a relative displacement between S-SRR chains of half a chain period.…”

Section: Tag and Reader Design And Fabricationmentioning

confidence: 99%

“…However, a double chain of S-SRRs is considered in this paper, with a relative displacement between S-SRR chains of half a chain period. The dimensions of the S-SRRs are those considered in [50,51]. A detail of the layout of the double S-SRR chain is depicted in Figure 2 Let us now consider the design of the CPW transmission line of the reader.…”

Section: Tag and Reader Design And Fabricationmentioning

confidence: 99%

“…A detail of the layout of the double S-SRR chain is depicted in Figure 2 Let us now consider the design of the CPW transmission line of the reader. In [50,51], a S-SRR identical to those of the tag was etched in the back substrate side of the CPW, a 50 V line. The purpose of this resonant element etched in the reader side is to prevent from the appearance of inter-resonator coupling in the tag chain (through magnetoinductive waves [55][56][57][58][59][60]) as well as multiple couplings between the line and the S-SRRs of the chain [30].…”

Section: Tag and Reader Design And Fabricationmentioning

confidence: 99%

“…Another approach, based on time domain, was recently reported by the authors [50,51]. Within this approach, tags consist of a chain of identical resonant elements etched or printed on a dielectric substrate.…”

Section: Introductionmentioning

confidence: 99%

“…In [50,51], the resonant elements are S-shaped split ring resonators S-SRRs. Tag reading proceeds sequentially through tag motion, by transversally displacing the tag over a coplanar waveguide transmission line fed by a harmonic signal tuned to the resonance frequency of the SSRRs.…”

Section: Introductionmentioning

confidence: 99%

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High data density and capacity in chipless radiofrequency identification (chipless-RFID) tags based on double-chains of S-shaped split ring resonators (S-SRRs)

et al. 2017

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Abstract. The data density per surface (DPS) is a figure of merit in chipless radiofrequency identification (chipless-RFID) tags. In this paper, it is demonstrated that chipless-RFID tags with high DPS can be implemented by using double-chains of S-shaped split ring resonators (S-SRRs). Tag reading is achieved by near-field coupling between the tag and the reader, a CPW transmission line fed by a harmonic signal tuned to the resonance frequency of the S-SRRs. By transversally displacing the tag over the CPW, the transmission coefficient of the line is modulated by tag motion. This effectively modulates the amplitude of the injected (carrier) signal at the output port of the line, and the identification (ID) code, determined by the presence or absence of S-SRRs at predefined and equidistant positions in the chains, is contained in the envelope function. The DPS is determined by S-SRR dimensions and by the distance between S-SRRs in the chains. However, by using two chains of S-SRRs, the number of bits per unit length that can be accommodated is very high. This chipless-RFID system is of special interest in applications where the reading distance can be sacrificed in favor of data capacity (e.g., security and authentication). Encoding of corporate documents, ballots, exams, etc., by directly printing the proposed tags on the item product to prevent counterfeiting is envisaged.

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