Ultrawideband Textile Antenna for Wearable Microwave Medical Imaging Applications

Lin, Xichen; Chen, Yifan; Gong, Zheng; Seet, Boon‐Chong; Huang, Ling; Lu, Yilong

doi:10.1109/tap.2020.2970072

Cited by 111 publications

(71 citation statements)

References 43 publications

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“…Textile antennas have been extensively researched and have shown performance comparable to their rigid counterparts [4]. The advances in textile antennas leverage fabrication methods such as conductive fabrics [4], [8]- [11], and embroidered conductors [5], [12]. A demonstration of a functional RF textile system is presented in [7], where a power amplifier is integrated with bespoke fabric transmission lines.…”

Section: Introductionmentioning

confidence: 99%

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Omnidirectional Dual-Polarized Low-Profile Textile Rectenna With Over 50% Efficiency for Sub-μW/cm² Wearable Power Harvesting

Wagih¹,

Weddell²,

Beeby³

2021

IEEE Trans. Antennas Propagat.

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Despite the recent advances in textile antennas, in complete systems such as a rectenna, the efficiency of fully-textile solutions has been over 46% lower than hybrid textile/rigid implementations. This paper presents a fully-textile rectenna for ultra-low power sub-µW/cm 2 applications. A dual-polarized omnidirectional low-profile textile antenna is presented. The rectenna is based on a compact inductively-matched rectifier. The textile-based rectifier occupies 0.22 cm 2 and achieves a state-ofart Power Conversion Efficiency (PCE) of 41.8% at −20 dBm, at 820 MHz, despite its lossy substrate. A triple-band rectifier is then designed and fabricated to show the scalability of the matching approach. The rectifier is characterized using a new figure of merit "average PCE" over a time period while charging a capacitor. Time-varying s-parameters are used to quantify the impact of the capacitor's charge on the impedance matching. The rectifier directly charges a 1.32 mF capacitor up to 1 V in 0.41 and 4.5 seconds from 10 and 0 dBm, respectively. Wireless testing of the proposed rectenna demonstrates over 50% and 40% PCE below 1 µW/cm 2 in space and on-body, respectively. The rectenna efficiently receives power from mismatched polarization and with a 360 • half-power beamwidth.

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Section: Introductionmentioning

confidence: 99%

“…Recently, a broadband wearable rectenna has been based on un-isolated bow-tie elements [6]. The broadband design implies that an unshielded antenna is used [8]. Hence the rectenna's PCE has been over 50% lower than its textile microstrip patch counterpart in [1], at the same power density.…”

Section: Introductionmentioning

confidence: 99%

Omnidirectional Dual-Polarized Low-Profile Textile Rectenna With Over 50% Efficiency for Sub-μW/cm² Wearable Power Harvesting

Wagih¹,

Weddell²,

Beeby³

2021

IEEE Trans. Antennas Propagat.

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“…Certain textile antenna applications impose additional requirements on the radiation of the antenna. For instance, textile antennas for medical imaging need to radiate into the body [99], unlike antennas radiating off-body for communicating with a nonwearable device, or on-body communicating with other antennas worn by the same user. Although shielding in this case becomes less relevant, compliance with SAR regulations is crucial.…”

Section: ) Safety Considerations and Application-specific Trade-offsmentioning

confidence: 99%

E-Textile Technology Review–From Materials to Application

et al. 2021

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Wearable devices are ideal for personalized electronic applications in several domains such as healthcare, entertainment, sports and military. Although wearable technology is a growing market, current wearable devices are predominantly battery powered accessory devices, whose form factors also preclude them from utilizing the large area of the human body for spatiotemporal sensing or energy harvesting from body movements. E-textiles provide an opportunity to expand on current wearables to enable such applications via the larger surface area offered by garments, but consumer devices have been few and far between because of the inherent challenges in replicating traditional manufacturing technologies (that have enabled these wearable accessories) on textiles. Also, the powering of e-textile devices with battery energy like in wearable accessories, has proven incompatible with textile requirements for flexibility and washing. Although current e-textile research has shown advances in materials, new processing techniques, and one-off e-textile prototype devices, the pathway to industry scale commercialization is still uncertain. This paper reports the progress on the current technologies enabling the fabrication of e-textile devices and their power supplies including textile-based energy harvesters, energy storage mechanisms, and wireless power transfer solutions. It identifies factors that limit the adoption of current reported fabrication processes and devices in the industry for mass-market commercialization. INDEX TERMSWearables, e-textile devices, e-textile power sources, e-textile manufacturing and scalability.

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“…These diseases might involve strokes of the brain, breast cancers, bone fractures, and damage to the sub-skin [49][50][51][52][53][54][55][56]. In light of this, Lin et al [57] proposed novel low-profile ultra-wideband full-textile antenna architecture for portable medical imaging systems in the microwave. The antenna offered an easy-to-fabricate monopole frame made of lightweight polyester fabrics and conductive copper taffeta, resulting in a small and versatile framework for functional applications that conforms to the curved nature of human bodies.…”

Section: Textile Wearable Antennasmentioning

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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Ultrawideband Textile Antenna for Wearable Microwave Medical Imaging Applications

Cited by 111 publications

References 43 publications

Omnidirectional Dual-Polarized Low-Profile Textile Rectenna With Over 50% Efficiency for Sub-μW/cm² Wearable Power Harvesting

Omnidirectional Dual-Polarized Low-Profile Textile Rectenna With Over 50% Efficiency for Sub-μW/cm² Wearable Power Harvesting

E-Textile Technology Review–From Materials to Application

Recent Advances in Wearable Antenna Technologies: A Review

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Ultrawideband Textile Antenna for Wearable Microwave Medical Imaging Applications

Cited by 111 publications

References 43 publications

Omnidirectional Dual-Polarized Low-Profile Textile Rectenna With Over 50% Efficiency for Sub-μW/cm2 Wearable Power Harvesting

Omnidirectional Dual-Polarized Low-Profile Textile Rectenna With Over 50% Efficiency for Sub-μW/cm2 Wearable Power Harvesting

E-Textile Technology Review–From Materials to Application

Recent Advances in Wearable Antenna Technologies: A Review

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Product

Resources

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Omnidirectional Dual-Polarized Low-Profile Textile Rectenna With Over 50% Efficiency for Sub-μW/cm² Wearable Power Harvesting

Omnidirectional Dual-Polarized Low-Profile Textile Rectenna With Over 50% Efficiency for Sub-μW/cm² Wearable Power Harvesting