Design of a compact UHF RFID tag antenna using an inductively coupled parasitic element

Kim, Tae-Ik; Kim, Uisheon; Choi, Jaehoon

doi:10.1002/mop.25753

Cited by 13 publications

(4 citation statements)

References 5 publications

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“…The prepared conductive ink has been used to print RFID tag and reader antennas with satisfactory performance. GNP conductive ink screen printed RFID tag antennas with mid–long range are designed with T-matching and nested slot techniques. − For best matching between the tag antenna and the bonded RFID chip, the impedances of the antenna and the chip should be conjugately matched at the operating frequency. The matching factor can be expressed as where Z c = R c + jX c is the impedance of the RFID chip and Z a = R a + jX a is the tag antenna impedance.…”

Section: Resultsmentioning

confidence: 99%

Screen-Printed Graphite Nanoplate Conductive Ink for Machine Learning Enabled Wireless Radiofrequency-Identification Sensors

Leng

Pan

Zhang

et al. 2019

ACS Appl. Nano Mater.

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In this study, we demonstrate sustainable conductive screen printing ink containing graphite nanoplates (GNPs) prepared by means of combining shear and ultrasonication exfoliation processes with the aid of mixed-solvent strategy of isopropanol (IPA)–water mixtures. The screen printed GNP ink features high conductivity of 4.66 × 104 S/m, green preparation, low manufacturing cost and has the potential for industrial scale-up productions. We first benchmark the GNP conductive ink and screen printed samples to investigate the rheology of the ink and its compatibility for industrial production. The high loading GNP ink is further applied to scalable and efficient production of ultrahigh frequency (UHF) radiofrequency identification (RFID) tag antenna and reader antenna. A low-cost, accurate wireless liquid sensing system capable of sensing the content of the liquids via machine learning data sets by feedforward neural network is demonstrated for ubiquitous IoT sensing applications. The experimental results demonstrate that the GNP ink printed RFID tags and reader antennas can provide satisfactory read range and performance for many practical RFID applications, such as inventory and security. Furthermore, the printed RFID wireless sensor incorporating neural network machine learning can accurately label the content of colorless, transparent, and unidentified liquids, illustrating the potential in low-cost, green, and industrial scalable production of GNP conductive ink printed RFID antennas and sensing systems for massive IoT applications deployment enabling ubiquitous wireless connectivity.

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Section: Resultsmentioning

confidence: 99%

Screen-Printed Graphite Nanoplate Conductive Ink for Machine Learning Enabled Wireless Radiofrequency-Identification Sensors

Leng

Pan

Zhang

et al. 2019

ACS Appl. Nano Mater.

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“…The read range is the maximum distance that the tag can respond and transmit data back to the reader. The read range r for the tag can be calculated using Friis free-space formula [4] as where λ is the operating wavelength, P t is the power transmitted by the reader, G t is the gain of the reader antenna and G r is the simulation gain of the tag antenna. P th is the minimum threshold power for chip activation, and τ is the PTC given by (1).…”

Section: Resultsmentioning

confidence: 99%

Research on U-shaped tuning stub RFID tag on different objects

Chen

Lin

Chen

2014

Int. J. Microw. Wireless Technol.

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A new ultra-high frequency radio frequency identification (RFID) tag antenna, which is comprised a U-shaped tuning stub and a dipole radiator for different permittivity surfaces is investigated, fabricated, and measured. For a conjugate match to the NXP G2XM chip impedance of 29–j137 at 915 MHz, a dipole tag antenna with U-shaped stubconnected to dipole arms was designed. Simple size adjustments of the U-shaped tuning stub and dipole radiator of the antenna allow for easy control of the antenna resistance and inductive reactance, from which the chip impedance requirement may be readily satisfied. The read range of the prototype antenna attached on a different permittivity surfaces (εr= 1–4) can reach more than 4.5 m, which has been tested for an RFID reader with 4.0 W of effective isotropic radiated power. The antenna structure consists of two dipole load bars and two loop electrically connected. The design offers more choice of freedom to tune the input impedance of the proposed antenna. Measurement data are presented which are in good agreement with simulation results. The design is suitable for mounting on all kinds of objects. The fabricated tag sensitivity of −3 dBm, read range of 7 m on the x–z and y–z planes, and the measured orientation radiation patterns were obtained in the desired frequency band.

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“…Some compact antenna structures have been reported using inductively coupled structure [9–14], inverted-F [15, 16], meandered antenna [5, 17, 18], and some other techniques [19–21]. In [9–18] utilizes conventional single-antenna structure while some other utilizes dual-antenna structure [5, 20–22]. Since the conventional single-antenna element RFID tag uses a single antenna for both the receiving and backscattering, it has some inherent limitations.…”

Section: Introductionmentioning

confidence: 99%

A single-sided meandered-dual-antenna structure for UHF RFID tags

Kamalvand

Pandey

Meshram

2017

Int. J. Microw. Wireless Technol.

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A meandered-dual-antenna structure is proposed for UHF radiofrequency identification (RFID) tag. It is composed of two independent antennas printed on the one side of the substrate board. One of the antennas is exclusively used for receiving and harvesting sufficient energy to the tag chip having the complex conjugate impedance of the receiving antenna. The other is for backscatter to enhance maximum differential radar cross-section with purely real input impedance, to enhancement the read range. The receiving antenna is formed by a rectangular loop and a parasitic meandered line. The rectangular loop is used as a feeding element for the meandered line. The backscattering antenna is made using a meandered dipole along with a thin rectangular strip. The input impedance of the receiving antenna is designed to be conjugate matched to the chip impedance (13.5-j110 Ω), whereas the input impedance of backscattering antenna alternatively switched to open and short circuit for modulating the backscattered field. The input impedance of receiving and backscattering antennas is measured using differential probe technique. The simulated and measured results are found in good agreement. It is also demonstrated that the read range of UHF RFID system increased considerably by using the dual-antenna structure.

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Design of a compact UHF RFID tag antenna using an inductively coupled parasitic element

Cited by 13 publications

References 5 publications

Screen-Printed Graphite Nanoplate Conductive Ink for Machine Learning Enabled Wireless Radiofrequency-Identification Sensors

Screen-Printed Graphite Nanoplate Conductive Ink for Machine Learning Enabled Wireless Radiofrequency-Identification Sensors

Research on U-shaped tuning stub RFID tag on different objects

A single-sided meandered-dual-antenna structure for UHF RFID tags

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