An improved design of wearable strain sensor based on knitted RFID technology

Liu, Yuqiao; Levitt, Ariana; Kara, Christina; Şahin, Cem; Dion, Geneviève; Dandekar, Kapil R.

doi:10.1109/cama.2016.7815769

Cited by 23 publications

(19 citation statements)

References 5 publications

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“…As the chamber was unchanged, τ remains constant for both measurements. Combining (2) and 3, the radiation efficiency of the AUT can be found…”

Section: Reverberation Chambermentioning

confidence: 99%

“…Specifically, radio frequency identification (RFID) and wearable antennas are enabling new advances in body-area networks and biomedical sensing. For example, our team has developed a flexible 'Bellyband' antenna [1,2], which is designed, programmed, and manufactured using computer-aided weft knitting techniques. The folded dipole antenna geometry at 900 MHz is knitted using conductive silver-coated nylon yarns and a passive RFID tag is inserted into the band during knitting.…”

Section: Introductionmentioning

confidence: 99%

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Efficiency measurement of the flexible on‐body antenna at varying levels of stretch in a reverberation chamber

Tajin

Bshara

Liu

et al. 2019

IET microw. antennas propagation

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Flexible antennas have the potential to transform wearable and fabric‐based wireless sensing technologies. The antenna discussed in this study is part of a sensing system that uses the back‐scattered power level as the decision metric. For a good wireless sensor, it is necessary to offer a feasible read range and maintain good distinctions in the back‐scattered power levels between the different states (i.e. level of stretch) of the antenna. Moreover, effects due to human body proximity should be minimised. For these reasons, the radiation efficiency is a crucial parameter to investigate. This study presents the radiation efficiency measurement of the proposed flexible knitted ‘Bellyband’ antenna at two different levels of stretch in a reverberation chamber. This work validates the reverberation chamber measurements through comparison with simulations and anechoic chamber measurements at 900 MHz. Moreover, this work demonstrates how the approach can be used to quantify bellyband antenna efficiency in the vicinity of a human body. Finally, the efficiency results were used to predict the read range of Bellyband radio frequency identification technology.

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“…As the chamber was unchanged, τ remains constant for both measurements. Combining (2) and 3, the radiation efficiency of the AUT can be found…”

Section: Reverberation Chambermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficiency measurement of the flexible on‐body antenna at varying levels of stretch in a reverberation chamber

Tajin

Bshara

Liu

et al. 2019

IET microw. antennas propagation

Self Cite

View full text Add to dashboard Cite

show abstract

“…Wearable antennas are those antennas that work within the human body, such that the human body consumes some of the radiated energy. Thus, the antenna output reduces [19][20][21][22]. Wearable antennas are also challenging in terms of textile-based antenna performance concerning (dielectric constant (εr), loss tangent (δ), and thickness (h)) of the substrate materials, the high conductivity of the materials (σ), and the antenna in bending scenarios.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Wearable Antenna Technologies: A Review

Mahmood¹,

Aris²,

Saeidi³

et al. 2020

PIER B

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Wearable antennas have received a great deal of popularity in recent years owing to their enticing characteristics and opportunities to realize lightweight, compact, low-cost, and versatile wireless communications and environments. These antennas must be conformal, and they must be built using lightweight materials and constructed in a low-profile configuration when mounted on various areas of the human body. These antennas ought to be able to function close to the human body with limited deterioration. These criteria render the layout of wearable antennas demanding, particularly when considering factors such as investigating the usability of textile substrates, high conductive materials during fabrication processes, and the effect of body binding scenarios on the performance of the design. Although there are minor differences in magnitude based on the implementations, several of these problems occur in the body-worn deployment sense. This study addresses the numerous problems and obstacles in the production of wearable antennas, their variety of materials, and the techniques of manufacturing alongside with bending scheme. This is accompanied by a summary of creative features and their respective approaches to address these problems recently raised by work in this area by the science community.

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“…Wearable antennas have many applications in the medical industry as body sensor networks. Since the antenna operates in close proximity or is directly attached to the human body, compact design is important for patient comfort and ease of use particularly if the unit must be worn for longer time periods [1][2][3][4]. Other common requirements include low profile, lightweight, mechanical flexibility, easy fabrication, and low cost [5,6].…”

Section: Introductionmentioning

confidence: 99%

E-Field Distribution in Ex-Vivo Porcine Skin Layer from a Subsurface UHF Transmitter

Albadri

Salchak

Thiel

et al. 2020

2020 14th European Conference on Antennas and Propagation (EuCAP)

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A tuned small slot antenna has been used for radio communications with internal transceivers/transmitters for invivo medical applications. The 2.45 GHz properties (permittivity and conductivity) shows that porcine skin tissue can be used as a substitute for human skin tissue in medical applications. In this study, a measure of the E-field distribution on the skin surface of human and porcine tissue is presented. Ex vivo measurements on boneless layered pork belly-fat (45mm thick 300mm x 150 mm sample of skin, fat and muscle) were compared with numerical modelling for a subdermal PIFA tuned antenna. The surface electric field distribution is quite well matched to an analytical formula over a 70dB dynamic range. The conductivity ( = 4 S/m, r = 10) and relative permittivity adjusted to fit the measurement profile aligned with previously reported values. These results support the strategy that field strength measurements can be used to locate an injects radio transmitter.

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An improved design of wearable strain sensor based on knitted RFID technology

Cited by 23 publications

References 5 publications

Efficiency measurement of the flexible on‐body antenna at varying levels of stretch in a reverberation chamber

Efficiency measurement of the flexible on‐body antenna at varying levels of stretch in a reverberation chamber

Recent Advances in Wearable Antenna Technologies: A Review

E-Field Distribution in Ex-Vivo Porcine Skin Layer from a Subsurface UHF Transmitter

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