Browsing by Author "Parkkila, Mikko"

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    Momenttimenetelmä laskennallisessa sähkömagnetiikassa
    (2009) Parkkila, Mikko; Ylä-Oijala, Pasi; Elektroniikan, tietoliikenteen ja automaation tiedekunta; Turunen, Markus
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    Study on mutual coupling in mobile multiantenna device
    (2012) Parkkila, Mikko; Renko, Antti; Radiotieteen ja -tekniikan laitos; Sähkötekniikan korkeakoulu; School of Electrical Engineering; Nikoskinen, Keijo
    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.