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SAR study of different MIMO antenna designs for LTE application in smart mobile handsets
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
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2013 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 61, no 6, 3270-3279 p.Article in journal (Refereed) Published
Abstract [en]

This paper mainly focuses on the specific absorption rate (SAR) of the dual-element LTE MIMO antenna in mobile phones. Four designs of dual-element MIMO antenna (namely, dual semi-ground-free planar inverted-F antenna (PIFA), co-located antenna, dual OG PIFA in parallel position, and dual OG PIFA in orthogonal position) are studied under four typical LTE frequency points (0.75, 0.85, 1.9, and 2.1/2.6 GHz) when the ground plane length varies from 90 to 150 mm. The SAR, when dual elements operate simultaneously, is also studied through the SAR to PEAK location spacing ratio (SPLSR) according to the FCC standard. The simulations are carried out on both an SAM head phantom and a flat phantom by CST 2011, and measurements on the flat phantom are made with iSAR and DASY4 to verify the accuracy of our simulations.

Place, publisher, year, edition, pages
2013. Vol. 61, no 6, 3270-3279 p.
Keyword [en]
LTE, MIMO, mobile handset, specific absorption rate
National Category
Telecommunications Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-134252DOI: 10.1109/TAP.2013.2250239ISI: 000319871400043Scopus ID: 2-s2.0-84878719556OAI: oai:DiVA.org:kth-134252DiVA: diva2:665950
Funder
Swedish Research Council, 621-2011-4620
Note

QC 20131121

Available from: 2013-11-21 Created: 2013-11-20 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Mobile Antenna Systems for 4G and 5G Applications with User Body Interaction
Open this publication in new window or tab >>Mobile Antenna Systems for 4G and 5G Applications with User Body Interaction
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the thesis, the user body effect on antennas in a mobile terminal is discussed. In order to overcome the degradation of Multiple-Input Multiple-Output (MIMO) performance due to the user body effect, a quad-elements MIMO antenna array which can mitigate the body effect through an adaptive antenna switching method is introduced for 4G mobile terminals. In addition, various bezel MIMO antennas that are robust to the impedance mismatching caused by the user effect have also been presented.

The study of user body effect is later extended to frequency bands at 15 GHz and 28 GHz for future 5G communication systems. The results reveal that a human body will cause a significant shadowing loss, which will be a critical loss in 5G cellular networks.

The electromagnetic field (EMF) exposure of a mobile terminal is also studied in this thesis. Below 6 GHz, the simultaneous transmission specific absorption rate (SAR) for MIMO antennas is the primary concern due to its complicated assessment procedures. Above 6 GHz, the free space power density is adopted as the basic parameter of exposure limits globally, and preliminary studies have been presented to address major challenges in EMF exposure assessment for 5G mobile terminals. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 65 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2017:137
Keyword
Antenna, MIMO, mmWave, Mobile communication, SAR, Power density, User body effect, Channel modeling, Multiplex efficiency
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-215266 (URN)978-91-7729-550-1 (ISBN)
Public defence
2017-10-27, Kollegiesalen, Brinellvägen 8, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20171005

Available from: 2017-10-05 Created: 2017-10-05 Last updated: 2017-11-08Bibliographically approved

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He, Sailing

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