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Author:Pennanen, Tuomas
Title:Antenni ilmanlaadun mittauslaitteessa
Antenna in Air Quality Measuring Instrument
Publication type:Master's thesis
Publication year:2010
Pages:79      Language:   fin
Department/School:Elektroniikan, tietoliikenteen ja automaation tiedekunta
Main subject:Sähkömagnetiikka   (S-96)
Supervisor:Nikoskinen, Keijo
Instructor:
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201203131413
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  1285   | Archive
Keywords:inverted F-antenna
meander-antenna
impedance matching
invertoitu F-antenni
meander-antenni
impedanssisovitus
Abstract (eng): In this master's thesis an antenna for a measurement instrument used in building automation was designed and fabricated.
In order to improve the producability and to reduce manufacturing costs the antenna was integrated as a part of the printed circuit board of the measurement device.
The radiation pattern of the antenna needed to be wide-angled and the radiation efficiency needed to be good.
The resonant frequency needed to be selectable during manufacturing of the device, because the regulations in different market areas might forbid the use of certain frequencies.

Small antenna structures proved to be unsuitable for the intended application.
Their resonant bandwidth is typically quite narrow and therefore nearby materials and the printed circuit board have an increased effect on the impedance matching.
Two resonant quarter wave structures were analyzed more closely and it was observed, that it was possible to achieve the needed bandwidth using these structures.
The analyzed structures were an inverted F-antenna and a meander-antenna.
The impedance matching of the selected structures was possible to achieve without any external components.
The most important parameters affecting the impedance matching were identified and a circuit model based on these parameters was used in antenna matching.

Based on the simulation and measurement results an inverted F-antenna was selected to be used in the measurement instrument.
This decision was made because the inverted F-antenna was shown to be less susceptible to the mismatch caused by manufacturing tolerances than a meander-antenna.
The selection of the resonant frequency was implemented by placing a copper strip next to the tip of the antenna.
The connection of the copper strip decreased the resonant frequency of the antenna.
Abstract (fin): Tässä työssä suunniteltiin ja toteutettiin antenni taloautomaatiosovelluksissa käytettävään mittauslaitteeseen.
Laitteen valmistettavuuden parantamiseksi ja kustannussäästöjen saavuttamiseksi antenni haluttiin yhdistää osaksi mittauslaitteen piirilevyä.
Antennin säteilykuvion oli oltava laajakeilainen ja säteilyhyötysuhteen hyvä.
Antennin resonanssitaajuuden haluttiin olevan valittavissa laitteen valmistusvaiheessa, koska eri markkina-alueilla ei säädösten takia ole mahdollista käyttää samaa taajuusaluetta.

Pienten antennirakenteiden todettiin soveltuvan aiottuun käyttötarkoitukseen huonosti.
Niiden kaistanleveys on tyypillisesti varsin kapea, jolloin antennin läheisyydessä olevien materiaalien sekä antennia tukevan piirilevylaminaatin valmistustoleranssien vaikutus antennin sovitukseen korostuu.
Työssä tarkasteltiin lähemmin kahta resonoivaa neljännesaallon rakennetta, joiden avulla todettiin saavutettavan riittävä kaistanleveys.
Tarkastellut rakenteet olivat invertoitu Fantenni ja meander-antenni.
Valittujen rakenteiden impedanssisovitus oli mahdollista tehdä ilman ulkoisia komponentteja.
Sovitukseen pääasiallisesti vaikuttavat parametrit tunnistettiin ja niihin pohjautuvaa piirimallia käytettiin antenneja viritettäessä.

Suoritettujen simulaatioiden ja mittausten perusteella mittauslaitteen antenniksi valittiin invertoitu F-antenni, jonka todettiin olevan meander-antennia epäherkempi valmistustoleranssien aiheuttamalle epäsovitukselle.
Taajuusalueen valinta toteutettiin sijoittamalla antennin kärkeen kupariliuska, jonka kytkeminen laski antennin resonanssitaajuutta.
ED:2010-04-07
INSSI record number: 39411
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