Design concept of a mobile handset antenna to mitigate user's hand effect

Kim, Jong Man; Kong, K.C.; Park, Myun‐Joo; Chung, Young-Seek; Lee, Byungje

doi:10.1002/mop.23715

Cited by 3 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Measured results agree with the simulated results obtained using the three‐dimensional (3D) full‐wave electromagnetic field simulator HFSS [26]. Based on 3:1 VSWR or 6‐dB return loss, which is widely used as the design specification of the internal WWAN mobile device antenna [27, 28], the obtained lower band and upper band can, respectively, cover the 704–960 and 1710–2690 MHz bands for eight‐band WWAN/LTE operation.…”

Section: Results Of Fabricated Antennasupporting

confidence: 58%

Bandwidth enhancement of WWAN/LTE tablet computer antenna using embedded parallel resonant circuit

Liu

Chou²

2011

Micro & Optical Tech Letters

View full text Add to dashboard Cite

By embedding a printed parallel resonant circuit, the lower‐band bandwidth of the proposed internal tablet computer antenna is greatly enhanced.This bandwidth‐enhancement technique allows the proposed antenna to cover the eight‐band wireless wide area network/long term evolution operation in the 704–960 and 1710–2690 MHz bands with a small size of 12 × 60 × 3.8 mm3 in the tablet computer. The main radiator of the antenna comprises a patch monopole, a longer shorted strip, and a shorter shorted strip. The latter two shorted strips form the outer boundary of the antenna and are parasitically excited by the patch monopole. The parallel resonant circuit is formed by embedding a chip‐inductor‐loaded narrow strip in‐between the longer shorted strip and the patch monopole, with the narrow strip whose front terminal connected to the patch monopole and end section gap‐coupled to the longer shorted strip. This embedded circuit can lead to the generation of a parallel resonance seen at the antenna's feeding point. By controlling the parallel resonance to be at the high‐frequency tail of the resonant mode at about 800 MHz contributed by the longer shorted strip, an additional resonance can be generated, which can result in dual‐resonance excitation of the original single‐resonance mode. Thus, a wide antenna's lower band is obtained. Further, the patch monopole can contribute a resonant mode to combine additional resonant modes contributed by the two shorted strips to form a wide antenna's upper band. Details of the proposed antenna with the embedded parallel resonant circuit are described in the article. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:305–309, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26580

show abstract

Section: Results Of Fabricated Antennasupporting

confidence: 58%

Bandwidth enhancement of WWAN/LTE tablet computer antenna using embedded parallel resonant circuit

Liu

Chou²

2011

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…Proposals to keep the current from flowing on the mobile phone chassis have been proposed such as creating a current choke [1]. Modifications to the mobile phone chassis can be made to keep the current from flowing on areas influenced by the hand [3]. To suppress regions of high electric field concentration on the antenna, such as slots on PIFA antennas, the slots can be replaced by lumped elements [6].…”

Section: Antenna Design Considerationsmentioning

confidence: 99%

Influence of the Hand on the Specific Absorption Rate in the Head

Douglas

Ofli

et al. 2012

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

The influence of the user's hand holding a mobile phone to the ear on the peak spatial-average Specific Absorption Rate (psSAR) averaged over any 1 g and 10 g of tissue in the head is investigated. This study is motivated by recent reports that found substantial increases in psSAR by the presence of the hand in some cases. Current measurement standards prescribe the measurement of SAR in a head phantom without a hand present. The mechanisms of interaction between the hand and mobile phone models are studied. Simulations and measurements at 900 and 1800 MHz have been conducted to complement the understanding of the hand grip parameters leading to higher SAR in the head. Numerical simulations were conducted on four mobile phone models, and parameters such as the palm-phone distance and hand position were varied. Measurements of 46 commercial mobile phones were made, and the maximum psSAR with different hand positions and palm-phone distances was recorded. Both simulations and measurements have found increases in the psSAR in the head of at least 2.5 dB due to the presence of the hand. Furthermore, the psSAR is sensitive to the hand grip, i.e., the variations can exceed 3 dB.

show abstract

A Study on a Planar Folded RFID Reader Antenna by Minimizing Hand Effects For UHF Band Application

Park¹,

Lee²

2012

J. Korea Inst. Intelligent. Transp. Syst.

View full text Add to dashboard Cite

In this paper, a new planar folded UHF band RFID reader antenna is suggested. For the antenna suggested in this paper, 4 PIFA (Planar Inverted F Antenna) micro-strip structures are adopted. The size is 50 mm × 50 mm × 6.2 mm. The gain of the antenna is 1.1 dBi, the VSWR is 1.2:1, and the efficiency is 63.3 %. The radiation pattern is designed as upper direction. Identification distance for the RFID tags is improved by minimizing hand effects with properly integrating 4 PIFAs.

show abstract

Design concept of a mobile handset antenna to mitigate user's hand effect

Cited by 3 publications

References 3 publications

Bandwidth enhancement of WWAN/LTE tablet computer antenna using embedded parallel resonant circuit

Bandwidth enhancement of WWAN/LTE tablet computer antenna using embedded parallel resonant circuit

Influence of the Hand on the Specific Absorption Rate in the Head

A Study on a Planar Folded RFID Reader Antenna by Minimizing Hand Effects For UHF Band Application

Contact Info

Product

Resources

About