Low-profile wearable UHF antenna for portable radios and radar applications

Ren, Yu‐Jiun

doi:10.1109/ursigass.2011.6050407

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…A low-profile wideband (300-1000MHz) elliptical monopole realized on a 10.2cmx10.2cm ceramic substrate (anatase titanium dioxide, relative permittivity close to 100, thickness=3mm) was suggested in [149], to be used as a compact radiator for personal radios and short-range radars. The monopole size is around one tenth of the free-space wavelength at 300MHz.…”

Section: A Multi-antenna Systems For Wide Spatial Coveragementioning

confidence: 99%

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.

106

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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: A Multi-antenna Systems For Wide Spatial Coveragementioning

confidence: 99%

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.

106

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“…This is possible because obtaining the same input in a communication system is necessary. Microwave power dividers are used to split multi-channel signals into RF power amplifiers, mixers, antenna feed networks, phased array antennas, and many other systems [8]. In addition, the power divider can split one input signal into two or more output signals [9].…”

Section: Introductionmentioning

confidence: 99%

Design and Development of Mini-Compact Wilkinson Power Divider for X-Band Man-Pack Surveillance Radar

Rahayu,

Utami,

Praludi

et al. 2023

J. Elektron. dan Telekomun.

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This paper presents the design and development of a mini-compact Wilkinson Power Divider (WPD) operating at 9.3 GHz, with a wide bandwidth of 200 MHz, for the Man-Pack Surveillance Radar (MPSR) application. The design of the WPD was carried out using Advanced Design System (ADS) software with a microstrip feeding technique. The substrate material used in this design was Duroid Roger 5880, which has a thickness (h) of 1.575 mm, dielectric constant (εr) of 2.20, and loss tangent (tan δ) of 0.0009. A WPD was designed, developed, and measured. The simulation results obtained included return loss (S11) -37.50 dB, (S22) -26.59 dB, (S33) -26.09 dB, insertion loss (S21) -3.61 dB and (S31) - 2.55 dB, and isolation (S32) -12.89 dB. Overall, the simulation result parameters worked at a frequency of 9.3 GHz. Furthermore, when the WPD measurement produces a measured return loss of (S11) -28.69 dB, (S22) -28.5 dB, (S33) -29.95 dB, insertion loss (S21) -6.61 dB, and (S31) -7.55 dB, and isolation (S32) -21.89 dB. The dimensions resulting from the realization were 20.5 mm x 20 mm.

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“…Multiple-antenna technology is a popular wireless technique yielding increased bandwidth, throughput, and signal gain [1]. However, for wearable applications the proximity to the user's body will affect antenna-to-antenna interactions [2], whilst body geometry limits both the number and spacing of elements [3]. Antenna arrays are often employed to realise a diversity gain over a single-channel equivalent, with the nature of the multipath environment and the channel fading characteristics dictating overall performance [4].…”

Section: Introductionmentioning

confidence: 99%

Multiple antenna channel characterisation for wearable devices in an indoor stairwell environment

Catherwood

Scanlon

2018

IET Microwaves, Antennas & Propagation

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Any building with more than one floor will have stairwells of some form, yet this area is often neglected in channel characterization studies. We present fading channel models and examine attainable spatial diversity gains at 90% signal reliability for an off-body multiple antenna system at frequencies of 3, 4, and 5 GHz in an indoor stairwell. Additionally we investigate received power, mutual coupling and channel cross-correlation, signal combining modelling, and antenna spatial diversity; the authors believe this is a valuable advancement beyond current knowledge to understand wearable MIMO technology in stairwell environments. Results reveal that 2-branch spatial diversity techniques offer signal gains over individual single channels in the range of 1.7 to 3.3 dB for LOS and 1.8 to 3.4 dB for NLOS for each of the three investigated frequencies, while 3-channel diversity combining appears to offer no significant additional gain over the 2-branch combinations. Furthermore, for NLOS cases the best fit statistical distribution channel models were found to change when spatial diversity was utilized; this highlights mitigated channel fading and increased signal reliability.

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Low-profile wearable UHF antenna for portable radios and radar applications

Cited by 5 publications

References 6 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

Design and Development of Mini-Compact Wilkinson Power Divider for X-Band Man-Pack Surveillance Radar

Multiple antenna channel characterisation for wearable devices in an indoor stairwell environment

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