Potential and Practical Limits of Time-Domain Reflectometry Chipless RFID

Popperl, Maximilian; Parr, Andreas; Mandel, Christian; Jakoby, Rolf; Vossiek, Martin

doi:10.1109/tmtt.2016.2593722

Cited by 32 publications

(17 citation statements)

References 17 publications

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“…Then, the tag code can be estimated from the echoes reflected from a set of reflectors implemented on the tag attached to an object. In other words, existence or absence of these echoes and their time positions are used to identify the tag code [2,3]. In frequency domain (FD) based tags, the RFID reader interrogates the tag with an RF signal and then the tag retransmits the frequency signature to the reader.…”

Section: Introductionmentioning

confidence: 99%

Compact Printable Inverted-M Shaped Chipless RFID Tag Using Dual-Polarized Excitation

et al. 2019

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A novel and compact dual-polarized (DP) chipless radio-frequency identification (RFID) tag is presented in this paper. This tag can read both vertical and horizontal orientations within its frequency band, which improves the robustness and detection capability of the RFID system. The proposed tag makes use of the slot length variation encoding technique to improve the encoding capacity. This technique can duplicate the encoding capacity, thereby reducing the overall tag size by almost 50%. In particular, the proposed tag has an encoding capacity of 20 bits in the 3–8 GHz frequency band and achieves data density of around 15.15 bits/cm2. Three prototypes are fabricated and tested outside an anechoic chamber. Furthermore, one tag is tested at different distances (10 cm, 30 cm, and 60 cm) from the reader and the measured results are compared. The simulated and measured results are in reasonable agreement, with acceptable shifts at some frequencies due to fabrication and experimental errors.

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Section: Introductionmentioning

confidence: 99%

Compact Printable Inverted-M Shaped Chipless RFID Tag Using Dual-Polarized Excitation

et al. 2019

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“…Generally, these encoding techniques can be classified into various domains, such as time, frequency, phase, and hybrid-domains [3]. In time-domain-based systems [4,5], the RFID reader interrogates the tag with a sequence of short pulses. Subsequently, the tag receives the interrogating pulses and then retransmits the response signal as a train of echoes with some time delays.…”

Section: Introductionmentioning

confidence: 99%

Four-State Coupled-Line Resonator for Chipless RFID Tags Application

Abdulkawi

Sheta

2019

Electronics

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A novel quad-state coupled-line microstrip resonator is proposed for compact chipless radio frequency identification (RFID) tags. The proposed resonator can be reconfigured to present one of four possible states: 00, 01, 10, and 11, representing, no resonance, resonance at f2, resonance at f1, and resonance at both f1 and f2, respectively. The frequency span between f2 and f1 can be easily controlled, thereby reducing the required spectrum. Moreover, the proposed technique allows the storage of a large amount of data in a compact size to reduce the cost per bit. A multi-resonator prototype consisting of six resonators is designed, analyzed, and experimentally characterized. This prototype is implemented on the RT Duroid 5880 substrate with a dielectric constant of 2.2, loss tangent of 0.0009, and thickness of 0.79 mm. The designed configuration can be reconfigured for 46 codes. Two complete the RFID tags, including the six resonators and two orthogonally polarized transmitting and receiving antennas, are implemented and tested. The first tag code is designed for all ones, 111111111111, and the second tag is designed as 101010101010 code. Experimental results show good agreement with the simulation.

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“…The Internet of Things (IoT) is the focus of a deep global investigation and exploration with the objective of connecting an outsized number of "things"such as smart sensors, tags, and detectors [1][2][3][4][5][6]. Indeed, automated sensing, identification, and physical tracking of objects are essential and fundamental for the development of modern electronic society.…”

Section: Introductionmentioning

confidence: 99%

A High-Density L-Shaped Backscattering Chipless Tag for RFID Bistatic Systems

Issa

Alshoudokhi

Ashraf

et al. 2018

International Journal of Antennas and Propagation

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Chipless radiofrequency identification (RFID) technology is very promising for sensing, identification, and tracking for future Internet of Things (IoT) systems and applications. In this paper, we propose and demonstrate a compact 18-bit, dual polarized chipless RFID tag. The proposed tag is based on L-shaped resonators designed so as to maximize the spectral and spatial encoding capacities. The proposed RFID tag operates an over 4 GHz frequency band (i.e., 6.5 GHz to 10.5 GHz). The tag is simulated, fabricated, and tested in a nonanechoic milieu. The measured data have shown good agreement with the simulation results, with respect to resonators' frequency positions, null depth, and null bandwidth over the operating spectrum. The proposed design achieves spectral and spatial encoding capacities of 4.5 bits/GHz and 18.8 bits/cm 2 , respectively. This, in turn, gives an encoding density of 4.7 bits/GHz/cm 2 . For code identification, we exploit the frequency content of the backscattered signals and identify similarity/correlation features with reference codes.

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Potential and Practical Limits of Time-Domain Reflectometry Chipless RFID

Cited by 32 publications

References 17 publications

Compact Printable Inverted-M Shaped Chipless RFID Tag Using Dual-Polarized Excitation

Compact Printable Inverted-M Shaped Chipless RFID Tag Using Dual-Polarized Excitation

Four-State Coupled-Line Resonator for Chipless RFID Tags Application

A High-Density L-Shaped Backscattering Chipless Tag for RFID Bistatic Systems

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