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Author:Holopainen, Jari
Title:Handheld DVB and Multisystem Radio Antennas
Kannettavan DVB-vastaanottimen ja monijärjestelmäradion antennit
Publication type:Licentiate thesis
Publication year:2008
Pages:87      Language:   eng
Department/School:Elektroniikan, tietoliikenteen ja automaation tiedekunta
Main subject:Radiotekniikka   (S-26)
Supervisor:Icheln, Clemens ; Tretyakov, Sergei
Instructor:Tretyakov, Sergei
Electronic version URL: http://urn.fi/urn:nbn:fi:tkk-011818
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark S80     | Archive
Keywords:small antennas
internal antenna
coupling structures
capacitive coupling element
direct feed
DVB-H
mobile TV
multisystem radio
effect of user
interoperability
pienet antennit
sisäinen matkapuhelinantenni
kytkentärakenne
kapasitiivinen kytkentäelementti
suorasyöttörakenne
DVB-H
mobiili-TV
käyttäjän vaikutus
yhteentoimivuus
Abstract (eng):In this licentiate thesis the implementation of small internal DVB-H antennas for handheld multisystem radios is studied, and several prototypes and simulated designs are presented and evaluated.

Since the volume that can be reserved for antennas is very restricted, the limits for the size of capacitive coupling element based antenna structures inside handsets of different size were studied.
The results indicate that the smallest required volume of the coupling element which ensures sufficient performance in today's typical-size monoblock mobile handsets would be about 3 - 4 cm3.
Instead, for tablet-size and open clamshell-size terminals the antenna element are shown to be significantly smaller and thinner.
Direct-feed-based structures can provide very low profile antenna solutions for tablet and clamshell-type terminals.

The effect of the user on performance of the DVB-H antenna was studied for some cases.
Maximum of 5 - 9 dB decrease in the total efficiency was shown and thus the effect of the user seems to be a significant challenge for the operation of DVB-H.
Relatively low isolation, about 18 dB, between the DVB-H and GSM900 antennas was demonstrated and thus the interoperability of DVB-H and GSM900 systems seems impossible without additional filtering.
Abstract (fin):Tässä lisensiaattityössä on tutkittu sisäisen DVB-H-antennin toteuttamista monijärjestelmäpäätelaitteessa ja esitetty muutamia antenniprototyyppejä ja simuloituja antennikonstruktioita.

Koska antenneille varattu tila päätelaitteen sisällä on rajallinen, työssä on tutkittu pienimmän mahdollisen kytkentäelementtiin perustuvan antennin vaatimaa tilavuutta erikokoisissa päätelaitteissa.
Tutkimuksen tuloksena esitetään, että riittävään suorituskykyyn tyypillisen kokoisessa päätelaitteessa päästään kytkentäelementillä, jonka tilavuus on noin 3 - 4 cm3.
Tabletti- ja avonaisessa simpukkapäätelaitteessa riittää tilavuudeltaan ja korkeudeltaan huomattavasti kompaktimpi antennielementti tai suorasyöttörakenne.

Työssä tutkittiin myös käyttäjän vaikutusta DVB-H-antennin toimintaan.
Simuloimalla tehty tutkimus osoitti, että käyttäjä voi aiheuttaa jopa 5 - 9 desibelin häviöt kokonaishyötysuhteeseen.
Simuloidussa esimerkkikonstruktiossa osoitettiin, että DVB-H- ja GSM900-antennien välillä on noin 18 desibelin isolaatio, joka ei riitä takaamaan järjestelmien samanaikaista toimintaa, vaan isolaatiota jouduttaisiin kasvattamaan muilla keinoilla.
ED:2008-09-16
INSSI record number: 36220
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