Two novel extremely low‐profile slot‐coupled two‐element patch antennas for UHF RFID of people

Švanda, Milan; Polívka, Milan

doi:10.1002/mop.24894

Cited by 17 publications

(17 citation statements)

References 8 publications

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“…Indeed, in the UHF RFID band, an effective shielding ground plane can still be small enough to allow antenna positioning on the wearer's torso/back or upper arm. For instance, in [109]- [113], a set of grounded printed antennas with one or two dielectric layers have been studied to realize RFID tags suitable for people identification in mass races and workplaces (in the sense that the tag must be suitable for integration on name-badges or runner number labels). A conventional halfwavelength rectangular patch (74mmx165mmx4.8mm) realized with a conductive fabric on a flexible and lightweight foam dielectric was able to give a 5dBi gain, when the antenna prototype was mounted on a body phantom [109].…”

Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning

confidence: 99%

“…The four patches are printed on a 1.82mm-thick high permittivity dielectric (ε r =10), and the antenna size is 70mmx105mm (onphantom measured gain is 0.6dBi). To avoid using high permittivity dielectrics, a layout made of two slot-coupled shorted patches (namely, two quarter-wavelength patches separated by a gap and shorted to the ground at the opposite edges) that are excited by a meandered dipole has been proposed in [113]. The dipole is printed on a thin dielectric layer and placed on the patch top surface.…”

Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning

confidence: 99%

“…The antenna overall size is 60mmx95mmx1mm, and the dielectric permittivity is 3.2. A further simplification is obtained by exciting the slotcoupled patches directly at the slot between the inner patch edges, so avoiding the need for the printed dipole [113] (Fig. 9a).…”

Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning

confidence: 99%

“…For the last two antennas, the measured gain is close to 1.6dBi, when the antennas are mounted on an agar phantom. An antenna made of two slot-coupled shorted-patches as in [113] was also presented in [114]. The antenna is 40mmx116mm wide.…”

Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning

confidence: 99%

“…It is worth noting that in [113] two additional thin slots are used for the antenna tuning. More recently [115], a wideband version of the antenna in [113]- [114] has been obtained by introducing on the patch top surface a loop delimited by a 1mm-wide slot pattern (thereby increasing the number of geometrical parameters available for best antenna tuning on a wide frequency band). The antenna is 32mmx137mm wide, and it is realized with a 1.57mm-thick Rogers RT5880 substrate (ε r =2.2).…”

Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning

confidence: 99%

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Wearable Antennas for Off-Body Radio Links at VHF and UHF Bands: Challenges, the state of the art, and future trends below 1 GHz

Nepa

Rogier

2015

IEEE Antennas Propag. Mag.

104

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Abstract-An in-depth survey of wearable antennas for offbody radio links in the VHF and UHF frequency bands (below 1 GHz) is presented. The review encompasses distinctive specifications, design criteria and challenges, material characterization procedures, antenna topologies and technologies, multi-antenna systems, dedicated testing procedures, applications and future trends.Index Terms-Wearable antennas, body-worn antennas, textile antennas, embroidered antennas, VHF antennas, UHF antennas, antennas for body-centric communications, antennas for body area networks, antennas for personal area networks, antennas for off-body wireless communications. I. INTRODUCTIONhere are several existing and forthcoming wireless applications that either require or can benefit from one or more antennas that are directly stitched on a piece of clothing or a garment, or integrated into a personal accessory (such as shoes, glasses, buttons, helmets). These antennas are usually referred to as body-worn antennas, textile antennas, BAN (Body Area Network) antennas, antennas for body-centric communications, wearable antennas. The last term is the one that is going to be used in this paper, as it denotes any antenna that is small and light enough to be worn or carried on one's body.In the last decades, hundreds of scientific papers on wearable antennas have been published in the open literature [1]- [8]. Therefore, for the sake of completeness and clarity, a valuable analysis of the state-of-the-art on wearable antennas should be limited to antennas for a specific application, a given frequency range, or a chosen antenna technology. In this context, the present review focuses on wearable antennas operating in the VHF band and part of the UHF frequency band (below 1 GHz). Choosing 1 GHz as an upper boundary for this review is highly relevant, as the operating frequency is usually the main parameter to discriminate among available antenna topologies, technologies and characterization techniques. Moreover, we limit our discussion on antennas for off-body radio links, also excluding antennas integrated into mobile terminals/cases and operating close to the body. Specifically, only wearable antennas that can be used separately from the radio unit are of interest here.VHF/UHF wearable antennas are mostly used in professional mobile radio communications for soldiers, emergency operators and law-enforcement personnel. VHF As far as VHF/UHF wearable antennas are concerned, many of their distinctive features are related to the fact that the corresponding free-space wavelength (with 30cm<<10m when 30MHz

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Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning

confidence: 99%

Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning

confidence: 99%

Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning

confidence: 99%

Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning

confidence: 99%

Section: B Wearable Antennas For Uhf-rfid Transpondersmentioning

confidence: 99%

See 3 more Smart Citations

Wearable Antennas for Off-Body Radio Links at VHF and UHF Bands: Challenges, the state of the art, and future trends below 1 GHz

Nepa

Rogier

2015

IEEE Antennas Propag. Mag.

104

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Novel low‐profile foam dielectric over‐the‐shoulder antenna based on coupled patches technique

Švanda

Polívka

Hudec

2013

Micro & Optical Tech Letters

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The article presents a novel wearable antenna composed of two coupled patches excited by an overlapping folded dipole. In spite of being operated in a relatively low frequency band 380 ÷ 390 MHz, the antenna shows a very low profile and other dimensions are acceptable as well. Besides a very low absorption of the radiated RF power by any nearby human body, it also ensures a very good immunity against influence on antenna parameters. In comparison to commonly used simple conformal monopole antennas, the presented solution provides a double‐side radiation pattern and a substantially higher gain. The antenna can be manufactured using very light and twistable foam dielectric and conductive fabric, and can be worn as a strap placed over the shoulder. It is intended to be used together with personal radio communication transceivers operated in the given frequency band. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:593–597, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27389

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Miniaturised wearable UHF-RFID tag with tuning capability

2012

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By carving a 'square-smile' slot profile over a folded patch, a miniaturised UHF-RFID tag is obtained, having a convenient two-step tuning mechanism (coarse and fine). This is useful to adapt the same tag to European and US frequencies and to make on-site corrections. The antenna is half the size of a credit card and can be read up to 5m when attached onto the body. The flexible and lightweight EPDM foam substrate makes the tag suited to be integrated in badges, wallets, pockets, plasters, wristbands and various garments.Introduction: Radio frequency identification (RFID) and wireless sensor systems are emerging technologies, attracting remarkable interest in security, healthcare, biomedical applications and even entertainment and social arts. Passive devices are particularly attractive for bodycentric platforms owing to their light weight, low cost and the absence of battery recharging. In particular, tags integrated into clothes, eventually hosting specific sensors, make it possible to remotely monitor human body activity [1,2]. In recent years, several on-body passive dipole and patch tags have been presented [3 -5] for the UHF (866-956 MHz) RFID frequency, but smaller layouts are however needed in some applications in order to simplify the integration with clothes or plasters. Miniaturisation of wearable passive tags generally produces a remarkable degradation of the antenna bandwidth as well as of the radiation efficiency due to the presence of the lossy human body. As a consequence, this can negatively affect the interoperability in different countries and the stability of the performances with respect to the specific body placement.Starting from previous experiments of the same authors with wearable tags in [2], this Letter proposes a new layout over a flexible and low-cost substrate with reduced external dimensions. The geometry provides a two-step tuning mechanism that permits in principle to easily adapt the same tag to any frequency inside the world-wide UHF RFID band (866-956 MHz) and even to make finer corrections for the specific placement. The antenna potentiality is here demonstrated by a parametric analysis and measurements on real prototypes.

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Two novel extremely low‐profile slot‐coupled two‐element patch antennas for UHF RFID of people

Cited by 17 publications

References 8 publications

Wearable Antennas for Off-Body Radio Links at VHF and UHF Bands: Challenges, the state of the art, and future trends below 1 GHz

Wearable Antennas for Off-Body Radio Links at VHF and UHF Bands: Challenges, the state of the art, and future trends below 1 GHz

Novel low‐profile foam dielectric over‐the‐shoulder antenna based on coupled patches technique

Miniaturised wearable UHF-RFID tag with tuning capability

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