Finger-Worn UHF Far-Field RFID Tag Antenna

Taylor, Paul S.; Batchelor, John C.

doi:10.1109/lawp.2019.2941731

Cited by 17 publications

(9 citation statements)

References 21 publications

(11 reference statements)

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“…This is as a result of some unique features it has, such as very low power requirements as well as possibility of being used as passive and even active sensors. In recent years, RFID has found increased use on the human body [1,2] often as sensors [3], in healthcare applications [4] or for tracking purposes [5]. This close interaction between the tag and the human body has been reported in [6].…”

Section: Introductionmentioning

confidence: 99%

Robustness evaluation of an inkjet‐printed epidermal ultra‐high‐frequency radio frequency identification tag

Oyeka

Batchelor

2021

Healthcare Tech Letters

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This paper examines the impact of daily activities on the performance of a body‐mounted radio frequency identification (RFID) tag inkjet printed onto tattoo transfer paper. This paper aims to assess how robust RFID tags of this nature are when mounted on the skin while the user undergoes various daily activities. The factors considered for these robustness tests are the effect of sweat and wear and tear on these tags during everyday use and also how it stands up to being exposed to water and soap during showering. Performance assessment was carried out using parameters such as point‐to‐point surface DC resistance as well as read range. Results show marginal effects on the tag performance and the tag continued to function during a normal day's activities, which lasted for 8 h, and rigorous activities like exercising but stopped functioning when there was severe damage to tag.

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Section: Introductionmentioning

confidence: 99%

Robustness evaluation of an inkjet‐printed epidermal ultra‐high‐frequency radio frequency identification tag

Oyeka

Batchelor

2021

Healthcare Tech Letters

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“…e antennas used in these smart devices operate at 2.45 GHz ISM band and ultrawideband (UWB) [2]. In [3], a male finger ring antenna was designed for healthcare applications. In [4], an UWB antenna was reported for the indoor positioning systems.…”

Section: Introductionmentioning

confidence: 99%

Conformal Quad-Port UWB MIMO Antenna for Body-Worn Applications

Govindan

Palaniswamy

Kanagasabai

et al. 2021

International Journal of Antennas and Propagation

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A conformal four-port multiple-input-multiple-output (MIMO) antenna operating at 2.4 GHz and ultrawideband (UWB) is presented for wearable applications. The unit element of the MIMO antenna is a simple rectangular monopole with an impedance bandwidth of 8.9 GHz (3.1–12 GHz). In the monopole radiator, stubs are introduced to achieve 2.4 GHz resonance. Also, a defect is introduced in the ground plane to reduce backside radiation. The efficiency of the proposed antenna is greater than 95%, and its peak gain is 3.1 dBi. The MIMO antenna has an isolation of >20 dB, and the estimated specific absorption rate (SAR) values for 1 gm of tissue are below 1.6 W/Kg. The size of the four-port MIMO antenna is 1.38λ0 × 0.08λ0 × 0.014λ0.

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“…However, in the case of wearables, particularly when there is a need to place devices in discrete locations, shading is a particular concern, which considerably limits power output. Harvesting from electromagnetic radiation, most commonly from radio-frequency (RF) spectrum sources, are well researched [10], [11], and commercial products exist to take advantage of this, such as the Powercast [12]. Unfortunately, devices typically require large antennas to gain sufficient power and often require the source emitting the power to be near to the receiving electronics.…”

Section: Introductionmentioning

confidence: 99%

Inertial Kinetic Energy Harvesters for Wearables: The Benefits of Energy Harvesting at the Foot

Beach

Casson

2020

IEEE Access

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Wearable devices promise to reduce strain on the healthcare system and to improve quality of life for users. However, adoption in healthcare settings is limited due in part to the need for constant battery maintenance; which leads to reduced adherence, more complex operation and missing sections of data. Energy harvesting can reduce the reliance on batteries, but the harvesting potential varies substantially depending on where the harvester is placed. Few previous studies investigating placement have considered the foot as a harvesting site, despite the significant interest in smart-shoes and the intrinsic social discreteness of wearable devices at the foot. We investigate the amount of power that can be harvested from four sites on the human body (wrist, hip, ankle and foot), with 12 participants walking on a treadmill. We analyse the differences in the frequency spectrum at each of these sites and perform a sweep of inertial energy harvester parameters to identify the optimal parameters for each site on the body. By considering both performing the harvesting at the foot, and the frequency distribution of the input spectrum present for the first time, we identify that harvesting at the foot provides multiple benefits: more power is available in total; greater physical size is available (compared to the wrist); lower Q harvesters can provide better broadband response; and the foot is the least sensitive location for changes in frequency of walking rate. For harvesters sized at 100 mm, we find that there is 4.2, 6.4 and 25.7 times more power at the hip, ankle and foot respectively compared to the wrist. Foot based sensors thus provide a promising approach towards future fully batteryfree wearable devices, motivating future work to investigate the sensing modalities that are feasible at the foot.INDEX TERMS Battery charging, energy harvesting, wearable sensors.

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Finger-Worn UHF Far-Field RFID Tag Antenna

Abstract: The version in the Kent Academic Repository may differ from the final published version. Users are advised to check http://kar.kent.ac.uk for the status of the paper. Users should always cite the published version of record.

Cited by 17 publications

References 21 publications

Robustness evaluation of an inkjet‐printed epidermal ultra‐high‐frequency radio frequency identification tag

Robustness evaluation of an inkjet‐printed epidermal ultra‐high‐frequency radio frequency identification tag

Conformal Quad-Port UWB MIMO Antenna for Body-Worn Applications

Inertial Kinetic Energy Harvesters for Wearables: The Benefits of Energy Harvesting at the Foot

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