VHF-Lb Vest Antenna

Jafargholi, Amir; Hosseinbeig, Ahmad; Emadi, Mohammad Javad; Farhoudi, L.; Golgoon, Seyed Ahmad

doi:10.2528/pierb09022201

Cited by 3 publications

(6 citation statements)

References 21 publications

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“…Above limitations can be removed by replacing the whip antenna by a helmet-integrated antenna or a flexible antenna integrated inside the clothing in the form of a strip vest or jacket. A vest antenna operating in the 30-80MHz VHF-LB band has been designed, realized and characterized in [55]. It is a flexible double-loop antenna, where one of the two loops acts as a parasitic element.…”

Section: Vhf Band Wearable Antennasmentioning

confidence: 99%

“…1). Typical layouts include doubleloop antennas [55]- [56], dipole-like antennas [57]- [58] (e.g. bow-tie antennas, folded dipoles, meandered dipoles), normal mode helices (Fig.…”

Section: Vhf Band Wearable Antennasmentioning

confidence: 99%

“…This is mainly due to the power absorption by the human body being the dominant loss mechanism [57], compared to the ohmic losses in the antenna conductive parts. To increase antenna efficiency, the size of the radiating elements has to be increased, hence requiring the development of flexible antennas that are made conformal to the body shape (dipolelike antennas [57]- [58], vest antennas [55]- [56]). As long wire VHF antennas are usually installed along body arms/legs, radiation pattern shape, null directions in radiation pattern, and field polarization are mostly affected by the posture of the antenna wearer and antenna position on the body [57]- [58].…”

Section: Introductionmentioning

confidence: 99%

“…VHF wearable antennas are applied for FM broadcasting reception [57]- [58] (87-108MHz), and reliable mobile communications for law-enforcement personnel [55]- [56] (at 30-80MHz), [59]- [62] (around 150MHz). At the UHF lower band, wearable antennas have been designed for personal and professional mobile radio systems operating around 400MHz [63]- [78] (as for example the TETRA [70] and TETRAPOL systems [73] [74]) and digital television (DTV) broadcasting reception (470-770 MHz) [81]- [88].…”

Section: Introductionmentioning

confidence: 99%

“…The body effect is substantial for VHF antennas [62], since the wearer's body is entirely inside the antenna reactive near-field region. Also, some radiation absorption resonances are located exactly in the VHF band [55]: [70][71][72][73][74][75][76][77][78][79][80] MHz for whole-body SAR (Specific Absorption Rate), and around 300MHz for head SAR [10].…”

Section: Introductionmentioning

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: Vhf Band Wearable Antennasmentioning

confidence: 99%

“…1). Typical layouts include doubleloop antennas [55]- [56], dipole-like antennas [57]- [58] (e.g. bow-tie antennas, folded dipoles, meandered dipoles), normal mode helices (Fig.…”

Section: Vhf Band Wearable Antennasmentioning

confidence: 99%