A Grip Study for Talk and Data Modes in Mobile Phones

Pelosi, Mauro; Fránek, Ondřej; Knudsen, Mikael B.; Christensen, Morten; Pedersen, Gert Frølund

doi:10.1109/tap.2009.2014590

Cited by 78 publications

(85 citation statements)

References 9 publications

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“…To select relevant hand and body placements we base our selection on a study by Pelosi et al [19] who identified common hand grip styles for both data and talk mobile phone usage. Based on their study we have selected three data style grips one with 3 fingers in the bottom third of the device, a five finger style and a double hand style, and a soft and a firm talk style grip with five fingers, as depicted in Figure 1.…”

Section: Measured Impacts Of the User Body On Gps Receptionmentioning

confidence: 99%

“…Our work builds on knowledge from existing studies of the body impact on in-phone GSM communication [1,19], while our methodology as well as our analysis results differ in nature from those described for GSM communication, since, first, the performance parameters of GPS differ from those of communication services, and, second, since a variety of factors, other than body effects, impacts GPS positioning more severely than GSM communication (due to the weakness of the GPS signals); such factors include the user's environment (e.g. urban or indoor) as well as, potentially, other simultaneous phone operations, e.g.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sensing and Classifying Impairments of GPS Reception on Mobile Devices

Blunck

Kjærgaard

Toftegaard

2011

Lecture Notes in Computer Science

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Abstract. Positioning using GPS receivers is a primary sensing modality in many areas of pervasive computing. However, previous work has not considered how people's body impacts the availability and accuracy of GPS positioning and for means to sense such impacts. We present results that the GPS performance degradation on modern smart phones for different hand grip styles and body placements can cause signal strength drops as high as 10-16 dB and double the positioning error. Furthermore, existing phone applications designed to help users identify sources of GPS performance impairment are restricted to show raw signal statistics. To help both users as well as application systems in understanding and mitigating body and environment-induced effects, we propose a method for sensing the current sources of GPS reception impairment in terms of body, urban and indoor conditions. We present results that show that the proposed autonomous method can identify and differentiate such sources, and thus also user environments and phone postures, with reasonable accuracy, while relying solely on GPS receiver data as it is available on most modern smart phones.

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Section: Measured Impacts Of the User Body On Gps Receptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sensing and Classifying Impairments of GPS Reception on Mobile Devices

Blunck

Kjærgaard

Toftegaard

2011

Lecture Notes in Computer Science

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“…Inclusion of the hand model affects SAR values as well as antenna performances [7÷10]. The hand effects on antenna performances highly depend on the hand grip and palmhandset gap [11,12]. The user's hand causes shifting the resonance frequency [13], reducing the channel's data rate [14] and detuning the antenna input impedance [7,13].…”

Section: Introductionmentioning

confidence: 99%

Effects of hand on EM absorption and antenna performances for internal handset PIFA

Faruque

Hossain

2017

Teh. vjesn.

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Preliminary communication The aim of this investigation is to analyse the effects of hand on electromagnetic (EM) absorption and antenna performances. The EM absorption is evaluated by using the specific absorption rate (SAR) in the human head and total absorbed power by the user in this paper. The antenna performance's parameters comprising radiation efficiency, total efficiency, gain and bandwidth are considered in this investigation. The analysis was performed using mobile phone with a human head and hand model in both cheek and tilt positions. The main part of the investigation is based on the finite-difference timedomain (FDTD) method. The results show that the SAR values are decreased and total absorbed power by user increased rapidly due to insertion of hand model. The user's hand also leads to degrade antenna's communication performance considerably. Moreover, the presented analysis provides some useful indication to design handset antenna considering hand effects. Keywords: antenna; FDTD method; hand effects; human hand model; human head model; PIFA (Planar Inverted F Antenna); SAR Djelovanje ruke na elektromagnetsku apsorpciju i funkcioniranje antene za interni PIFA ručni telefonPrethodno priopćenje Cilj ovog istraživanja je analizirati učinke ruke na elektromagnetsku (EM) apsorpciju i funkcioniranje antene. U radu se procjenjuje EM apsorpcija pomoću specifične brzine apsorpcije -specific absorption rate (SAR) u ljudskoj glavi i ukupne apsorbirane snage od strane korisnika. U radu se razmatraju parametri djelovanja antene uključujući učinkovitost zračenja, ukupnu učinkovitost, pojačanje i širinu frekvencijskog područja. Analiza je provedena pomoću mobilnog telefona položenog na obraz i s nagibom na obraz. Glavni dio istraživanja temelji se na finite-difference time-domain (FDTD) metodi. Rezultati pokazuju da su se SAR vrijednosti smanjile i da se ukupna snaga koju je korisnik apsorbirao brzo povećala zbog umetanja ručnog modela. Ruka korisnika također dovodi do znatnog smanjenja komunikacijskog učinka antene. Osim toga, predstavljena analiza daje neke korisne naznake za dizajn antene mobilnog telefona s obzirom na položaj ruke.

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“…As a result of new communication networks that operate in body-centric environments, body area networks (BANs) have been introduced; with a great number of the papers being published on the subject. The current research for BANs can be separated into three main groups: those which focus on the development of antennas for implant or wearable devices [5][6][7]; those which research the channel model with respect to body postures or consider the effect of multi-path propagations by other objects in a restricted interior space [8][9][10]; and finally those that examine the propagation characteristics in the vicinity of the human body or inside the human body through the specific absorption rate (SAR) [11][12][13]. However, most of papers are limited in the explanation of scattering waves because of the evaluation method by the FDTD method or physical experiments that provide total field results only, although analytical solutions for scattering problem in the inhomogeneous environment between the free space and the human body may be useful for the design of antennas considering the characteristics changed by the human body or for the effectual estimation of communication channels in BANs.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Estimation of Scattering Waves in Cylinder-Body Model for Body Area Networks: Comparison of Analyses With Unifrom Cylinder- And Slab-Body Models

Seo¹,

Saito²,

Takahashi³

et al. 2010

PIER B

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Abstract-This paper estimates separately the components of scattering waves generated in cylinder-body model for body area networks.For the evaluation, scattering field formulations in relation to uniform cylinder-and slab-body models are provided, and the reliability of the analyses is testified by the comparison with results computed by the finite-difference time-domain (FDTD) method. Creeping waves, cylinder leaky waves, and cylinder guided waves, which are created only in cylindrical structure, are extracted quantitatively by contrasting the scattering waves that are calculated with the two body models. In addition to the extracted waves, other components of scattering waves such as reflected waves, transmitted waves, surface waves, leaky waves, and guided waves also are examined. From evaluations with various operating frequencies and thicknesses of the body model, it is confirmed that reflected waves have the most influence on electrical characteristics of a source. Moreover creeping waves and cylinder leaky waves are generally dominant at the opposite side of the cylinder when a source is located near cylinder surface. Furthermore, the existence of creeping waves with low attenuation in the vicinity of cylinder surface is demonstrated by electric field intensities calculated by varying the observation point along cylinder axis.

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A Grip Study for Talk and Data Modes in Mobile Phones

Cited by 78 publications

References 9 publications

Sensing and Classifying Impairments of GPS Reception on Mobile Devices

Sensing and Classifying Impairments of GPS Reception on Mobile Devices

Effects of hand on EM absorption and antenna performances for internal handset PIFA

Quantitative Estimation of Scattering Waves in Cylinder-Body Model for Body Area Networks: Comparison of Analyses With Unifrom Cylinder- And Slab-Body Models

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