Bandwidth, SAR, and Efficiency of Internal Mobile Phone Antennas

Kivekäs, Outi; Ollikainen, J.; Lehtiniemi, Tuukka; Vainikainen, P.

doi:10.1109/temc.2004.823613

Cited by 155 publications

(75 citation statements)

References 17 publications

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“…So, different methods and techniques have been proposed to reduce SAR levels in human tissue, such as increasing the distance between the human head and the mobile handset antenna, auxiliary antenna elements, ferrite material, the electromagnetic band-gap (EBG) structures, artificial magnetic conductors (AMCs) surfaces, and metamaterials. As reported in [11,12], the effect of varying the distance between the antenna and user head has been investigated for a PIFA handset antenna, this study has shown that there is a proportional relation between SAR and antenna efficiency.…”

mentioning

confidence: 79%

Investigation of Dosimetry in Four Human Head Models for Planar Monopole Antenna with a Coupling Feed for LTE/WWAN/WLAN Internal Mobile Phone

Belrhiti

Riouch

Tribak

et al. 2017

J. Microw. Optoelectron. Electromagn. Appl.

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mentioning

confidence: 79%

Investigation of Dosimetry in Four Human Head Models for Planar Monopole Antenna with a Coupling Feed for LTE/WWAN/WLAN Internal Mobile Phone

Belrhiti

Riouch

Tribak

et al. 2017

J. Microw. Optoelectron. Electromagn. Appl.

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“…그러나 안테나가 소형화될수록 안테나의 대 역폭과 방사 효율이 감소하게 되므로 [2]～ [5] 이를 극 복하기 위한 연구가 필요하다. 휴대 단말기에서 그 라운드는 대역폭 및 방사 효율에 많은 영향을 미치 므로 [6] 그라운드의 특성 모드(characteristic mode) 분 석과 이 방사 모드를 효과적으로 커플링(coupling) 시킬 수 있는 방법에 대한 연구가 활발하게 진행되 어 왔다 [7], [8] . 이 기술은 안테나가 아닌 커플러(cou-…”

Section: ⅰ 서 론unclassified

A Small Antenna of High Radiation Efficiency Employing a Ground Radiator

Choi¹,

Lee²,

Park³

et al. 2012

The Journal of Korean Institute of Electromagnetic Engineering

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This paper introduces the method to utilize a terminal ground as a radiator only using reactive components without an antenna structure. Characteristics of the proposed antenna is compared with that of the meander IFA on the same ground plane(40×20 mm 2 ) for the bluetooth band. From simulation and measurement data, it is found that the proposed antenna using only capacitors provides the highest radiation efficiency. This is because of that the higher inductance reduces radiation resistance of a ground and the capacitor has a lower loss resistance comparing to that of the IFA or the inductor. In spite of the high radiation efficiency, the area (5×2.5 mm 2 ) of the proposed antenna is less than half of the area (12×2.5 mm 2 ) of the IFA.

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“…This undesirable tradeoff has inspired numerous research efforts to find a more attractive balance between providing conveniently small and stylish handset dimensions while preserving acceptable antenna performance. In this effort, the influence of the mobile-phone-environmentrelated parameters, such as chassis (ground plane) size and the antenna position on the ground plane, have been thoroughly investigated, see for example [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…It is known that the total radiation bandwidth of the mobile device is defined by both antenna properties and the chassis physical dimensions [1]. In [5], the authors show that if the chassis is resonant at the antenna-operating frequency, the bandwidth will increase significantly.…”

Section: Introductionmentioning

confidence: 99%

“…In [5], the authors show that if the chassis is resonant at the antenna-operating frequency, the bandwidth will increase significantly. A more detailed analysis in [1] demonstrated the chassis effects on both specific absorption rate (SAR) and radiation efficiency. It was demonstrated that the resonance of the chassis leads to an increase in SAR and a decrease in radiation efficiency.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved Handset Antenna Performance via an Electrically Extended Ground Plane

Ali

Wilson

et al. 2012

ISRN Communications and Networking

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A novel and practical approach is presented providing improved antenna performance without enlarging the antenna or the ground plane. The approach electrically extends the ground plane using wire(s) that behave as surface metal extensions of the ground plane. The wire extensions can be accommodated within typical handset housing or as part of the stylish metal used on the handset's exterior perimeter; hence don't require enlargement of the device. Consequently, this approach avoids the costs and limitations traditionally associated with physically lengthening of a ground plane. Eight variations are presented and compared with baseline antenna performance. Both far-field patterns and near-field electromagnetic scans demonstrate that the proposed approach controls the electrical length of the ground plane and hence its chassis wavemodes, without negatively impacting the characteristics of the antenna. Improvements in performance of up to 56% in bandwidth at 900 MHz and up to 12% in efficiency with a reduction of up to 12% in the specific absorption rate (SAR) are achieved. An 8% increase in efficiency with a 1.3% improvement in bandwidth and a 20% reduction in SAR is achieved at 1880 MHz. Thus, improvements in bandwidth are achieved without compromising efficiency. Further, improvements at lower frequencies do not compromise performance at higher frequencies.

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Bandwidth, SAR, and Efficiency of Internal Mobile Phone Antennas

Cited by 155 publications

References 17 publications

Investigation of Dosimetry in Four Human Head Models for Planar Monopole Antenna with a Coupling Feed for LTE/WWAN/WLAN Internal Mobile Phone

Investigation of Dosimetry in Four Human Head Models for Planar Monopole Antenna with a Coupling Feed for LTE/WWAN/WLAN Internal Mobile Phone

A Small Antenna of High Radiation Efficiency Employing a Ground Radiator

Improved Handset Antenna Performance via an Electrically Extended Ground Plane

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