Performance of a Multiband Diversity Antenna with Hand Effects

Plicanic, Vanja; Lau, Buon Kiong; Ying, Zhinong

doi:10.1109/iwat.2008.4511395

Cited by 18 publications

(16 citation statements)

References 11 publications

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“…Moreover, such antennas may not lend themselves to practical implementations according to today's requirements and trends. Thus, several recent studies focus on diversity [6]- [8] and capacity [9], [10] performance of common mobile phone antennas -compact, internal-to-chassis, multiband, low cost and robust. The effect of user is also investigated in [7]- [10].…”

Section: Performance Of Closely Spaced Mobile Terminal Antennasmentioning

confidence: 99%

Unleashing multiple antenna systems in compact terminal devices

Lau

Andersen

2009

2009 IEEE International Workshop on Antenna Technology

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ABSTRACT:The effective use of multiple antenna systems in compact terminal devices is plagued by the problems of mutual coupling and spatial correlation. Consequently, increasing the number of antennas per unit volume results in rapidly diminishing returns after an upper limit is reached. We review recent advances on this topic of closely coupled antennas, including several existing techniques that may be used to push the boundary further, such that closely spaced antennas can still give good performance. A new approach of decoupling closely spaced antennas is also introduced.

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Section: Performance Of Closely Spaced Mobile Terminal Antennasmentioning

confidence: 99%

Unleashing multiple antenna systems in compact terminal devices

Lau

Andersen

2009

2009 IEEE International Workshop on Antenna Technology

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“…The antennas' and the prototype's design, size and placement were chosen to resemble practical and implementable antenna solutions in a mobile phone. Design details on the antennas and the dual antenna prototype can be found in [10].…”

Section: Antenna Prototypes and Measurementsmentioning

confidence: 99%

Channel capacity performance of multi-band dual antenna in proximity of a user

Samuelsson

Lau

Derneryd

et al. 2009

2009 IEEE International Workshop on Antenna Technology

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ABSTRACT:This paper presents an evaluation of single input single output (SISO), single input multiple output (SIMO) and multiple input multiple output (MIMO) channel capacities for a dual antenna prototype in proximity of a user. The dual antenna prototype mimics today's small mobile phone design in size and in comprising internal, compact, multi-band antennas. Four different user cases are evaluated by measuring the antenna radiation performance for each of the different interactions between a phantom user and the antenna. Measurements of a single antenna prototype with user are also performed for comparisons between the SISO case and the SIMO/MIMO cases. Depending on the user interaction case, the MIMO capacity of the prototype is between 40-90% at 850 MHz and 60-80% at 2100 MHz higher than the SISO performance of the single antenna prototype or the best antenna on the dual antenna prototype.

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“…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]. This also contributes to degrade the radiation efficiency and increase absorption loss [13].…”

Section: Introductionmentioning

confidence: 99%

“…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]. This also contributes to degrade the radiation efficiency and increase absorption loss [13]. In [14], an investigation of effects of hand phantom on planar inverted-F antenna (PIFA) and helical antenna was presented.…”

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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Performance of a Multiband Diversity Antenna with Hand Effects

Cited by 18 publications

References 11 publications

Unleashing multiple antenna systems in compact terminal devices

Unleashing multiple antenna systems in compact terminal devices

Channel capacity performance of multi-band dual antenna in proximity of a user

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

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