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Mobile Antenna Systems for 4G and 5G Applications with User Body Interaction
KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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. 

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2017. , 65 s.
Serie
TRITA-EE, ISSN 1653-5146 ; 2017:137
Emneord [en]
Antenna, MIMO, mmWave, Mobile communication, SAR, Power density, User body effect, Channel modeling, Multiplex efficiency
HSV kategori
Forskningsprogram
Elektro- och systemteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-215266ISBN: 978-91-7729-550-1 (tryckt)OAI: oai:DiVA.org:kth-215266DiVA: diva2:1147366
Disputas
2017-10-27, Kollegiesalen, Brinellvägen 8, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20171005

Tilgjengelig fra: 2017-10-05 Laget: 2017-10-05 Sist oppdatert: 2017-11-08bibliografisk kontrollert
Delarbeid
1. Body-Insensitive Multimode MIMO Terminal Antenna of Double-Ring Structure
Åpne denne publikasjonen i ny fane eller vindu >>Body-Insensitive Multimode MIMO Terminal Antenna of Double-Ring Structure
Vise andre…
2015 (engelsk)Inngår i: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 63, nr 5, 1925-1936 s.Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this paper, we propose a novel multimode multi-input multi-output (MIMO) antenna system composed of a dual-element MIMO cellular antenna and dual-element MIMO Wi-Fi antenna for mobile terminal applications. The antenna system has a double-ring structure and can be integrated with the metal frame of mobile terminals. With the multimode excitation, the MIMO cellular antenna can operate at 830-900 MHz, 1700-2200 MHz, and 2400-2700 MHz, for 2G, 3G, and LTE bands, respectively. The MIMO Wi-Fi antenna can cover two Wi-Fi bands from 2.4 to 2.5 GHz and from 5.2 to 5.8 GHz. The effect of a user's body on the MIMO cellular antenna is investigated on CTIA standard phantoms and a real user. Since our antenna mainly operates in the loop mode, it has a much lower efficiency loss than conventional mobile antennas in both talking and data modes. Our theoretical analysis and experiments have shown that our design has low body loss and an attractive industrial design.

HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-171167 (URN)10.1109/TAP.2015.2408617 (DOI)000356513700005 ()
Merknad

QC 20150720

Tilgjengelig fra: 2015-07-20 Laget: 2015-07-20 Sist oppdatert: 2017-12-04bibliografisk kontrollert
2. User Body Effect on Phased Array in User Equipment for the 5G mmWave Communication System
Åpne denne publikasjonen i ny fane eller vindu >>User Body Effect on Phased Array in User Equipment for the 5G mmWave Communication System
Vise andre…
2017 (engelsk)Inngår i: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 16, 864-867 s.Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The millimeter-wave phased array in the user equipment (UE) for 5G communication is studied in this letter. In particular, the body effect on the phased array in the UE at 15 GHz is investigated with the 3-D measurement data, and its impact on some key parameters for phased array in the UE, such as the total scan pattern, the coverage efficiency, and the probability of detection, are analyzed.

sted, utgiver, år, opplag, sider
IEEE, 2017
Emneord
Coverage efficiency, fifth-generation mobile system, human body effects, millimeter wave (mmWave), phased array, user equipment (UE) antenna
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-208282 (URN)10.1109/LAWP.2016.2611674 (DOI)000399319100039 ()2-s2.0-85018949860 (Scopus ID)
Merknad

QC 20170609

Tilgjengelig fra: 2017-06-09 Laget: 2017-06-09 Sist oppdatert: 2017-10-05bibliografisk kontrollert
3. Channel Characteristics and User Body Effects in an Outdoor Urban Scenario at 15 and 28 GHz
Åpne denne publikasjonen i ny fane eller vindu >>Channel Characteristics and User Body Effects in an Outdoor Urban Scenario at 15 and 28 GHz
Vise andre…
(engelsk)Inngår i: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221Artikkel i tidsskrift (Fagfellevurdert) In press
Abstract [en]

The effect of a user’s body on channel characteristics for single user downlink transmission in an urban scenario for the 5th generation (5G) systems is investigated with ray-tracing at 15 GHz and 28 GHz. Three different designs of user equipment (UE) antennas are fabricated and integrated into a mobile phone prototype, and their 3D radiation patterns are measured both with and without a user. The user remains in Cellular Telephone Industries Association (CTIA) standard data mode and talk mode during measurements. The results show that the user’s body will cause a strong shadowing loss and generate a large fluctuation on the received signal strength of the UE at both 15 GHz and 28 GHz, which is crucial to channel modeling studies at frequencies above 6 GHz. In addition, the user’s body effect on a linear array system in UE is presented, and the main challenges for the future work are also addressed

HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-215256 (URN)10.1109/TAP.2017.2740959 (DOI)
Merknad

QC 20171005

Tilgjengelig fra: 2017-10-05 Laget: 2017-10-05 Sist oppdatert: 2017-10-05bibliografisk kontrollert
4. SAR study of different MIMO antenna designs for LTE application in smart mobile handsets
Åpne denne publikasjonen i ny fane eller vindu >>SAR study of different MIMO antenna designs for LTE application in smart mobile handsets
Vise andre…
2013 (engelsk)Inngår i: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 61, nr 6, 3270-3279 s.Artikkel i tidsskrift (Fagfellevurdert) 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.

Emneord
LTE, MIMO, mobile handset, specific absorption rate
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-134252 (URN)10.1109/TAP.2013.2250239 (DOI)000319871400043 ()2-s2.0-84878719556 (Scopus ID)
Forskningsfinansiär
Swedish Research Council, 621-2011-4620
Merknad

QC 20131121

Tilgjengelig fra: 2013-11-21 Laget: 2013-11-20 Sist oppdatert: 2017-12-06bibliografisk kontrollert
5. EMF Exposure Study Concerning mmWave Phased Array in Mobile Devices for 5G Communication
Åpne denne publikasjonen i ny fane eller vindu >>EMF Exposure Study Concerning mmWave Phased Array in Mobile Devices for 5G Communication
2016 (engelsk)Inngår i: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 15, 1132-1135 s.Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The electromagnetic field (EMF) exposure to millimeter-wave (mmWave) phased arrays in mobile devices for 5G communication is analyzed in this letter. Unlike the current cellular band, the EMF exposure in the mmWave band (10-200 GHz) is evaluated by the free-space power density instead of the specific absorption rate. However, current regulations have not been well defined for the mobile device application. In this letter, we present the power density property of phased arrays in mobile devices at 15 and 28 GHz. Uniform linear patch arrays are used, and different array configurations are compared. Suggestions for the power density evaluation are also provided.

sted, utgiver, år, opplag, sider
IEEE, 2016
Emneord
5G, device output power, electromagnetic field (EMF) exposure limit, mobile device, phased array, power density
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-187339 (URN)10.1109/LAWP.2015.2496229 (DOI)000374301400006 ()2-s2.0-84963959771 (Scopus ID)
Merknad

QC20160520

Tilgjengelig fra: 2016-05-20 Laget: 2016-05-20 Sist oppdatert: 2017-11-30bibliografisk kontrollert

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