Environmental Effects on RFID Tag Antennas

Dobkin, Daniel M.; Weigand, Steven M.

doi:10.1109/mwsym.2005.1516541

Cited by 198 publications

(86 citation statements)

References 3 publications

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“…While successful RFID applications are constantly being announced in many areas, the steel industry remains an exception. Both the metallic objects as well as those containing liquids represent two major bottlenecks when considering the design of RFID tags [1]. Obviously, all steel products fall into the metallic category and pose a challenge in the tag design, especially since the commercial RFID solutions are not workable for the steel or iron products.…”

Section: Introductionmentioning

confidence: 99%

A Metallic Rfid Tag Design for Steel-Bar and Wire-Rod Management Application in the Steel Industry

Chen¹,

Kuo²,

Lin³

2009

PIER

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Abstract-In recent years, RFID solutions are finding an increasing number of applications in a wide variety of industries. There are some natural limitations when applying RFID technology in the steel industry, because the tags do not function well in metallic environments. Even though some commercial RFID metal tags are available in the market, they are found to be too expensive by steel companies. This paper proposes a useful and practical RFID tag design for management applications involving steel-bar and wirerod products manufactured by the steel industry. The dual-function metallic RFID tag, comprising of both an RFID code and a barcode, involves technology advancement in RFID design, and named WindowTag (WinTag). The maximum read range of this tag can reach about 5.7 m for the radiated power of 4.0 W EIRP in free space. In the practical application, the maximum read ranges are about 2.3 m and 5.0 m for the worst and best case, respectively. The design methodology as well as simulation and measurement results of the WinTag are presented in this paper. The low profile and low cost features of the WinTag makes the RFID tag well suited for metallic type tag of labeling system that requires integration of RFID technology.

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Section: Introductionmentioning

confidence: 99%

A Metallic Rfid Tag Design for Steel-Bar and Wire-Rod Management Application in the Steel Industry

Chen¹,

Kuo²,

Lin³

2009

PIER

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“…Daily and McCann (2007) found that the read rate for passive tags in the vicinity of metallic surface can be as low as 0%. Empirical tests and simulations proved that the decrease in the electric field with proximity to metals or dielectrics materials leads to the decrease of UHF passive tag read range (Dobkin and Weigand, 2005). The literature supports the idea that the materials that passive tags are attached to can strongly influence the strength of radio signals (Dobkin and Weigand, 2005;Aroor and Deavours, 2007;Daily and McCann, 2007;Tzeng et al, 2008;Kim et al, 2011).…”

Section: Introductionmentioning

confidence: 60%

Analysis of the variability of RSSI values for active RFID-based indoor applications

Çalış¹,

BECERİK-GERBER²,

GÖKTEPE³

et al. 2013

Turkish J Eng Env Sci

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The results indicate that different system parameters caused variations in RSSI values as well as the detectability rates.Nevertheless, different test beds changed the influence of each parameter on the RSSI values. It is concluded that testing environment is a prominent parameter that affects the results and fluctuations in the RSSI values, and that the detectability rates cannot be attributed to any specific parameter that has been included in this study.

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“…Moreover, external components and microelectromechanical system sensors can be added for additional functionality [10]. However, the RFID system performance can be influenced by materials such as metals and water in the environment in which the tag has been applied because the wireless transmission is degraded with a subsequent reduction in the tag read range [7,9,11].Rather than using the UHF band discussed in [5], we propose a tag using high-frequency (HF) RFID, which transmits by induction between two coils and is widely used, often at 13.56 MHz, in short range applications such as NFC [12] and the MiFare system [13]. The use of magnetic coupling to communicate is advantageous in the presence of the human body which is highly capacitive and causes significant tuning problems in conventional antenna systems such as those at UHF.…”

mentioning

confidence: 99%

“…They however can carry more information and therefore are used in many logistics and asset tagging applications where wireless and non-line of sight identification is required [6]. RFID tags are also detectable when obscured by dirt, covered by polymer housing or even embedded with an object to be identified [7][8][9]. Moreover, external components and microelectromechanical system sensors can be added for additional functionality [10].…”

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confidence: 99%

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confidence: 99%

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Smart radio‐frequency identification tag for diaper moisture detection

Ziai

Batchelor

2015

Healthcare Technology Letters

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A passive smart tag is described that responds to dampness in diapers once a pre-defined threshold value is reached. A high-frequency (HF) system at 13.56 MHz is used as this allows operation through water or human tissues with less absorption that would occur for an ultra-HF signal. A circular spiral coil and swelling substrate facilitate a reaction to dampness that can be detected without contact to the diaper wearer. A prototype design is simulated and measured results are provided together with a demonstration of a tag integrated into a worn diaper.1. Introduction: Average life expectancy worldwide in 2025 will reach 73 years [1], with the elderly population expected to rise faster than the general population [2]. Longevity related disabilities and diseases will put more pressure on healthcare. In this Letter, our aim is to design a cheap flexible sensor embedded in a diaper to reduce the workload of carers in nursing homes by logging and notifying staff of the urinating habits of elderly residents.Wireless technologies are already contributing in many biomedical applications and there have been a number of recent studies reporting wireless diaper dampness detectors. In [3], a GSM network communication is used to a tele-monitor in the diaper comprising a processor and a humidity sensor, whereas [4] utilises Zigbee as the transmission system to a sensor including a signal converter, Zigbee module and power supply. A radio-frequency identification (RFID) system is proposed at ultra-high frequency (UHF) in [5] to help juveniles overcome nocturnal enuresis and for geriatrics with incontinence problems. A commercial UHF tag was placed in a diaper and was observed to decrease in function when it became surrounded by liquid and saturated superabsorbent gel. RFID systems are similar to barcoding, and can identify a tagged object. They however can carry more information and therefore are used in many logistics and asset tagging applications where wireless and non-line of sight identification is required [6]. RFID tags are also detectable when obscured by dirt, covered by polymer housing or even embedded with an object to be identified [7][8][9]. Moreover, external components and microelectromechanical system sensors can be added for additional functionality [10]. However, the RFID system performance can be influenced by materials such as metals and water in the environment in which the tag has been applied because the wireless transmission is degraded with a subsequent reduction in the tag read range [7,9,11].Rather than using the UHF band discussed in [5], we propose a tag using high-frequency (HF) RFID, which transmits by induction between two coils and is widely used, often at 13.56 MHz, in short range applications such as NFC [12] and the MiFare system [13]. The use of magnetic coupling to communicate is advantageous in the presence of the human body which is highly capacitive and causes significant tuning problems in conventional antenna systems such as those at UHF. Experimental studies of HF tag performance h...

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Environmental Effects on RFID Tag Antennas

Cited by 198 publications

References 3 publications

A Metallic Rfid Tag Design for Steel-Bar and Wire-Rod Management Application in the Steel Industry

A Metallic Rfid Tag Design for Steel-Bar and Wire-Rod Management Application in the Steel Industry

Analysis of the variability of RSSI values for active RFID-based indoor applications

Smart radio‐frequency identification tag for diaper moisture detection

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