Wearable Textile Antenna Magnetically Coupled to Flexible Active Electronic Circuits

Virili, Marco; Rogier, Hendrik; Alimenti, F.; Mezzanotte, P.; Roselli, L.

doi:10.1109/lawp.2014.2301277

Cited by 50 publications

(37 citation statements)

References 10 publications

(20 reference statements)

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“…A nongalvanic interconnection was proposed in [31] using magnetic coupling between two coils, one on fabric and the other on a flexible PCB. The drawback of that proposed system is related to the inherent complex impedance of the transformer at both terminals, i.e., fabric and PCB, which reduces the operational bandwidth of the transition according to the Bode-Fano Criterion [21].…”

Section: Fabric-to-rigid Pcb Interface Designmentioning

confidence: 99%

A Flexible 2.45-GHz Power Harvesting Wristband With Net System Output From −24.3 dBm of RF Power

Adami

Proynov

Hilton

et al. 2018

IEEE Trans. Microwave Theory Techn.

150

159

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Abstract-This paper presents a flexible 2.45-GHz wireless power harvesting wristband that generates a net dc output from a −24.3-dBm RF input. This is the lowest reported system sensitivity for systems comprising a rectenna and impedancematching power management. A complete system has been implemented comprising: a fabric antenna, a rectifier on rigid substrate, a contactless electrical connection between rigid and flexible subsystems, and power electronics impedance matching. Various fabric and flexible materials are electrically characterized at 2.45 GHz using the two-line and the T-resonator methods. Selected materials are used to design an all-textile antenna, which demonstrates a radiation efficiency above 62% on a phantom irrespective of location, and a stable radiation pattern. The rectifier, designed on a rigid substrate, shows a best-inclass efficiency of 33.6% at −20 dBm. A reliable, efficient, and wideband contactless connection between the fabric antenna and the rectifier is created using broadside-coupled microstrip lines, with an insertion loss below 1 dB from 1.8 to over 10 GHz. A self-powered boost converter with a quiescent current of 150 nA matches the rectenna output with a matching efficiency above 95%. The maximum end-to-end efficiency is 28.7% at −7 dBm. The wristband harvester demonstrates net positive energy harvesting from −24.3 dBm, a 7.3-dB improvement on the state of the art.

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Section: Fabric-to-rigid Pcb Interface Designmentioning

confidence: 99%

A Flexible 2.45-GHz Power Harvesting Wristband With Net System Output From −24.3 dBm of RF Power

Adami

Proynov

Hilton

et al. 2018

IEEE Trans. Microwave Theory Techn.

150

159

View full text Add to dashboard Cite

show abstract

“…[2][3][4][5][6][7][8][9][10][11] Up to now several designs involving slots and/or metamaterials have been proposed to generate a dual-band behavior [12][13][14]. The first designs were intrinsically narrow band in both bands.…”

Section: Introductionmentioning

confidence: 99%

Wearable Dual-Band Magneto-Electric Dipole Antenna for WBAN/WLAN Applications

Yan

Soh

Vandenbosch

2015

IEEE Trans. Antennas Propagat.

147

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A wearable dual-band magneto-electric dipole antenna is proposed. Two U-shaped slots are introduced on a dipole and the resulting electric and magnetic resonances are combined with the aim to produce a dual band with wideband characteristics. The antenna is fabricated fully using textiles, except for the feeding connector. Simulations and measurements confirm the wide bandwidth and a low backwards radiation in both the lower and the upper band. The antenna is robust and not very sensitive to bending when worn by the user. The specific absorption rate is studied numerically and proven to be well below the European limit of 2 W/kg. Index Terms-dual-band antenna, magneto-electric dipole antenna, wearable antenna, textile antenna

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“…Wearable textile systems basically consist of textiles and electronics aimed at improving the experience of the wearers. Recent research shows that typical applications of the wearable textile systems are wearable radio frequency identifications (RFIDs) and smart fabrics and interactive textiles (SFIT) [2]. The development of new conductive materials allows wearable RFIDs and SFIT to be unobtrusively integrated on smart garments.…”

Section: Introductionmentioning

confidence: 99%