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Author:Parkkila, Mikko
Title:Study on mutual coupling in mobile multiantenna device
Tutkimus keskinäiskytkennästä mobiilissa multiantenni järjestelmässä
Publication type:Master's thesis
Publication year:2012
Pages:vi + 77 s. + liitt. 16      Language:   eng
Department/School:Radiotieteen ja -tekniikan laitos
Main subject:Sähkömagnetiikka   (S-96)
Supervisor:Nikoskinen, Keijo
Instructor:Renko, Antti
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  1691   | Archive
Keywords:mobile phone
mutual coupling
antenna
isolation
matkapuhelin
keskinäiskytkeytyminen
antenni
PIFA
ILA
CCE
Dual-Loop
IFA
isolaatio
Abstract (eng): This thesis studies different ways to minimize mutual coupling between antennas in a mobile phone.
Different approaches introduced by the literature are investigated.
A focus is on antennas that are designed to operate at the same frequency bands.
Performance of the antennas should not suffer due to presence of the other antenna.
PIFA, ILA, Dual-Loop and CCE antennas are used in order to test if the different antenna topologies behave differently, position and orientation vice, in respect to isolation.

In the low band, 35 dB isolation is achieved in a single frequency and 20 dB over entire E-GSM900 band.
Additionally, over 20 dB isolation level was found easy to achieve in the high band.
Two prototypes were manufactured and measured in order to validate the results.
Abstract (fin): Tässä diplomityössä tutkitaan erilaisia tapoja vähentää kahden antennin välistä keskinäiskytkeytymistä matkapuhelimissa.
Tavoitteena on koota eri lähestymistavat tieteellisistä julkaisuista sekä selvittää paljonko yksinkertaisilla päätöksillä voi vaikuttaa.
Tällaisia päätöksiä ovat antennityypin, antennin asennon sekä antennin sijainnin valinta.
Antennityypit ovat yleisesti matkapuhelimissa käytettäviä antenneja: PIFA, ILA, Dual-Loop ja CCE.
Lisäksi työssä käytetään silmukka-antennia sekä IFA-antennia.

Simulaatioissa savutettiin 35 dB isolaatio yksittäisellä taajuudella ja yli 20 dB koko E-GSM900 kaistalla.
Lisäksi havaittiin että yli 20 dB isolaatio on helppo saavuttaa korkeammilla taajuuksilla.
Simulaatiotulokset todennetaan rakentamalla kaksi prototyyppiä ja mittaamalla niistä S-parametrit ja kokonaistehokkuus.
ED:2013-02-26
INSSI record number: 45872
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