Motion Tracking of a Human Subject in Healthcare Applications Using Compact Ultra Wideband Antennas

Bharadwaj, Richa; Swaisaenyakorn, Srijittra; Parini, C.G.; Batchelor, John C.; Alomainy, Akram

doi:10.4108/icst.mobihealth.2014.257728

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…8 Most of the wearable antennas employ flexible substrates such as fabric, jeans, or cotton. 9 Wash cotton, polyester, polycot, felt, 10 Panama, fleece silk, Velcro, 11 Tween, and nylon, are also considered as a dielectric substrates in these antennas. These materials are relatively less lossy, inexpensive, and are easily available in the market.…”

Section: Introductionmentioning

confidence: 99%

Design and comparative analysis of conventional and metamaterial‐based textile antennas for wearable applications

Ali¹,

Ullah²,

Shafi

et al. 2019

Int J Numerical Modelling

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In this paper, four different models of a 2.4 GHz flexible microstrip patch wearable antenna are designed and analyzed. The basic geometry of the radiating element of the antennas is a rectangular patch and is backed by conventional, mushroom‐type, slotted, and spiral electromagnetic band gap (EBG) ground planes. A 3‐mm‐thick wash cotton textile is used as a substrate material in the design of the antennas as well as EBG surfaces. An electro‐textile (Zelt) is used as a conductive material for the proposed antennas. The performance of these antennas is analyzed in terms of return loss, gain, bandwidth efficiency, and specific absorption rate (SAR) using Computer Simulation Technology Microwave Studio (CST MWS). The designed antennas are further investigated for on and off body conditions under normal and bent states. The experimental results show that the antennas radiate with an adequate gain (5.72‐7.3 dB), bandwidth (65.43‐103.1 MHz), and efficiency (55.51%‐74.04%), depending on the type of the ground plane used. The antenna backed by the mushroom‐type EBG gives the smallest value of SAR (1.79 W/kg < 2 W/kg), which makes it a suitable candidate for body worn applications in the unlicensed industrial, scientific, and medical (ISM) band.

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Section: Introductionmentioning

confidence: 99%

Design and comparative analysis of conventional and metamaterial‐based textile antennas for wearable applications

Ali¹,

Ullah²,

Shafi

et al. 2019

Int J Numerical Modelling

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show abstract

“…WBAN provides an immense potential in applications such as health monitoring [6,7], location tracking, and emergency rescue services [8,9]. Such applications require wireless devices to operate in close proximity to the human body, demanding a requirement for antennas that use flexible materials.…”

Section: Introductionmentioning

confidence: 99%

Compact Microstrip-Based Textile Antenna for 802.15.6 WBAN-UWB with Full Ground Plane

Samal

Soh

Zakaria

2019

International Journal of Antennas and Propagation

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The paper presents the design and investigation of a flexible all-textile antenna operating in the wireless body area network (WBAN) ultrawideband (UWB) specified by the IEEE 802.15.6 standard. The proposed antenna features an innovative and compact UWB radiator on top of the overall structure with a full ground plane on its reverse side. The radiator, which is based on a microstrip patch combined with multiple miniaturization and broadbanding methods, resulted in a simple topology and a compact size of 39 mm×42 mm×3.34 mm (0.51×0.55×0.043λ). In comparison to the literature, the proposed structure is considered to be the most compact microstrip-based textile UWB antenna to date featuring a full ground plane. The choice of the commercial textiles is also made based on cost efficiency, ease of accessibility, and ease of fabrication using simple tools. Meanwhile, the full ground plane enables the antenna operation in the vicinity of the human body with minimal body coupling and radiation towards it, ensuring operational safety. Besides its operation in the mandatory channels of the WBAN-UWB low and high bands, the proposed antenna also operates and preserves its performance in five other optional channels of the high band when placed on the body and under bend conditions of 30° and 60°. The proposed antenna successfully achieved the specific absorption rate below the regulated limit specified by the Federal Communications Commission.

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“…Majority of wearable antennas are based on textilematerials such as cotton, fabric, felt or jeans [5]. However other textiles such as wash cotton, curtain cotton, polyester, polycot, jean cotton [6], denim jeans [7], felt material [8], Tween, panama, moleskin, fleece, Perspex [9], Velcro [10], silk and nylon, are also used as a substrate materials.…”

Section: Introductionmentioning

confidence: 99%

Design and SAR Analysis of Wearable Antenna on Various Parts of Human Body, Using Conventional and Artificial Ground Planes

Ali¹,

Ullah²,

Khan³

et al. 2017

Journal of Electrical Engineering and Technology

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-This paper presents design and specific absorption rate analysis of a 2.4 GHz wearable patch antenna on a conventional and electromagnetic bandgap (EBG) ground planes, under normal and bent conditions. Wearable materials are used in the design of the antenna and EBG surfaces. A woven fabric (Zelt) is used as a conductive material and a 3 mm thicker Wash Cotton is used as a substrate. The dielectric constant and tangent loss of the substrate are 1.51 and 0.02 respectively. The volume of the proposed antenna is 113×96.4×3 mm 3 . The metamaterial surface is used as a high impedance surface which shields the body from the hazards of electromagnetic radiations to reduce the Specific Absorption Rate (SAR). For on-body analysis a three layer model (containing skin, fats and muscles) of human arm is used. Antenna employing the EBG ground plane gives safe value of SAR (i.e. 1.77W/kg<2W/kg), when worn on human arm. This value is obtained using the safe limit of 2 W/kg, averaged over 10g of tissue, specified by the International Commission of Non Ionization Radiation Protection (ICNIRP). The SAR is reduced by 83.82 % as compare to the conventional antenna (8.16 W/kg>2W/kg). The efficiency of the EBG based antenna is improved from 52 to 74 %, relative to the conventional counterpart. The proposed antenna can be used in wearable electronics and smart clothing.

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Motion Tracking of a Human Subject in Healthcare Applications Using Compact Ultra Wideband Antennas

Cited by 8 publications

References 9 publications

Design and comparative analysis of conventional and metamaterial‐based textile antennas for wearable applications

Design and comparative analysis of conventional and metamaterial‐based textile antennas for wearable applications

Compact Microstrip-Based Textile Antenna for 802.15.6 WBAN-UWB with Full Ground Plane

Design and SAR Analysis of Wearable Antenna on Various Parts of Human Body, Using Conventional and Artificial Ground Planes

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