Flexible dual‐diversity wearable wireless node integrated on a dual‐polarised textile patch antenna

Vanveerdeghem, Peter; Torre, Patrick Van; Stevens, Christiaan; Knockaert, Jos; Rogier, Hendrik

doi:10.1049/iet-smt.2013.0224

Cited by 15 publications

(13 citation statements)

References 20 publications

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“…By placing the electronics on the feed plane of the patch antenna, each very compact module may be unobtrusively integrated into garments or clothing [19]. In addition, each unit can be encapsulated together with the textile antenna into a breathable Thermoplastic PolyUrethane coating (TPU), implementing a washable system [20].…”

Section: A Antennamentioning

confidence: 99%

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Compact Personal Distributed Wearable Exposimeter

et al. 2015

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Abstract-A compact wearable Personal DistributedExposimeter is proposed, sensing the power density of incident radio-frequency (RF) fields on the body of a human. In contrast to current commercial exposimeters, our Personal Distributed Exposimeter, being composed of multiple compact personal wearable RF exposimeter sensor modules, minimizes uncertainties caused by the proximity of the body, the specific antenna used and the exact position of the exposimeter. For unobtrusive deployment inside a jacket, each individual exposimeter sensor module is specifically implemented on the feedplane of a textile patch antenna. The new wearable sensor module's high-resolution logarithmic detector logs RF signal levels. Next, on-board flash memory records minimum, maximum and average exposure data over a time span of more than two weeks, at a one-second sample period. Sample-level synchronization of each individual exposimeter sensor module enables combining of measurements collected by different nodes. The system is first calibrated in an anechoic chamber, and then compared to a commercially available single-unit exposimeter. Next, the Personal Distributed Exposimeter is validated in realistic conditions, by measuring the average RF power density on a human during a walk in an urban environment and comparing the results to spectrum analyzer measurements with a calibrated antenna.

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Section: A Antennamentioning

confidence: 99%

“…By employing the calibration data, a 1 dB resolution is achieved. To compensate the temperature-dependent offset, the output voltage of the DAC (Analog Devices AD5641 [22]) is automatically adjusted [19] as a function of the operating temperature.…”

Section: Calibrationmentioning

confidence: 99%

Compact Personal Distributed Wearable Exposimeter

et al. 2015

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“…Employing a state-of-the-art transceiver component allows reliable communication over a long range [43]. The microcontroller provides plenty of sensor connectivity and can be conveniently configured to process sensor data in real time.…”

Section: Sensing Computational and Transceiver Hardwarementioning

confidence: 99%

“…These components are implemented on a compact, low-profile, polyimide flexible circuit board (FCB), as in [9], [41], and [43]. To maintain flexibility, small electronic components were selected and distributed over a sufficiently large area to allow for small bending radii.…”

Section: F Integration Proceduresmentioning

confidence: 99%

Wearable Flexible Lightweight Modular RFID Tag With Integrated Energy Harvester

Lemey

Agneessens

Torre

et al. 2016

IEEE Trans. Microwave Theory Techn.

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Abstract-A novel wearable radio frequency identification (RFID) tag with sensing, processing, and decision-taking capability is presented for operation in the 2.45-GHz RFID superhigh frequency (SHF) band. The tag is powered by an integrated light harvester, with a flexible battery serving as an energy buffer. The proposed active tag features excellent wearability, very high read range, enhanced functionality, flexible interfacing with diverse low-power sensors, and extended system autonomy through an innovative holistic microwave system design paradigm that takes antenna design into consideration from the very early stages. Specifically, a dedicated textile shorted circular patch antenna with monopolar radiation pattern is designed and optimized for highly efficient and stable operation within the frequency band of operation. In this process, the textile antenna's functionality is augmented by reusing its surface as an integration platform for light-energy-harvesting, sensing, processing, and transceiver hardware, without sacrificing antenna performance or the wearer's comfort. The RFID tag is validated by measuring its stand-alone and on-body characteristics in free-space conditions. Moreover, measurements in a real-world scenario demonstrate an indoor read range up to 23 m in nonlineof-sight indoor propagation conditions, enabling interrogation by a reader situated in another room. In addition, the RFID platform only consumes 168.3 µW, when sensing and processing are performed every 60 s.Index Terms-Battery-assisted, energy harvesting, Internet of Things (IoT), radio frequency identification (RFID), textile antenna, wearable.

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“…The node is directly connected to textile antennas integrated into the garment and can operate continuously for many hours relying on the power provided by a small battery. Full details of the wireless node are documented in [17].…”

Section: Introductionmentioning

confidence: 99%

Correlated shadowing and fading characterization of MIMO off-body channels by means of multiple autonomous on-body nodes

Torre

Vanveerdeghem

Rogier

2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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Abstract-In off-body communication systems low-cost and compact transceivers are important for realistic applications. An autonomous off-body wireless node was designed and integrated onto a textile antenna. Channel measurements were performed for an indoor non line-off-sight 4x2 MIMO (Multiple-Input Multiple-Output) link using four off-body transmitting nodes and two similar fixed receiving nodes. The channel behavior is characterized as Rayleigh fading with lognormal shadowing and is fitted to a model determining fading and shadowing correlation matrices. The physics of the propagation is captured accurately by the model which is further used to simulate a link using diversity by means of Selection Combining, as implemented on the wireless nodes. The performance of measured and simulated links is compared in terms of outage probability level. The measurements and analysis confirm that the correlated shadowing and fading model is relevant for realistic off-body networks employing diversity by means of Selection Combining.

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Flexible dual‐diversity wearable wireless node integrated on a dual‐polarised textile patch antenna

Cited by 15 publications

References 20 publications

Compact Personal Distributed Wearable Exposimeter

Compact Personal Distributed Wearable Exposimeter

Wearable Flexible Lightweight Modular RFID Tag With Integrated Energy Harvester

Correlated shadowing and fading characterization of MIMO off-body channels by means of multiple autonomous on-body nodes

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