Analysis and modeling of surface-acoustic wave resonators

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorKoskela, Julius
dc.contributor.departmentDepartment of Engineering Physics and Mathematicsen
dc.contributor.departmentTeknillisen fysiikan ja matematiikan osastofi
dc.contributor.labMaterials Physics Laboratoryen
dc.contributor.labMateriaalifysiikan laboratoriofi
dc.date.accessioned2012-02-13T12:15:48Z
dc.date.available2012-02-13T12:15:48Z
dc.date.issued2001-01-12
dc.description.abstractThis thesis discusses the analysis and simulation of surface-acoustic wave (SAW) resonators. SAW resonators constitute building blocks for radio-frequency SAW bandpass filters, which are widely employed in modern cordless and cellular telecommunication systems. Theoretical tools for the analysis and simulation of SAWs and SAW resonators are vital in the development of high-performance SAW devices. The carrying theoretical concept is the excitation of acoustic waves in periodic electrode arrays. The first part of the thesis is concerned with the characterization of periodic electrode arrays with rigorous simulations. In this work a structure simulator based on combined finite-element and boundary-element methods has been implemented, and it has been applied to analyze leaky surface-acoustic waves (LSAW) in rotated Y-cut LiNbO3 and LiTaO3 substrates, and surface transverse waves (STW) in langasite. The second part of the thesis consists of contributions to phenomenological modeling. Firstly, it is shown that the parameters used in the phenomenological coupling-of-modes theory, popular in device design, may be efficiently extracted from rigorous simulations of periodic electrode arrays using a novel phase-shift algorithm. Secondly, so-called Plessky's model for the STW dispersion in periodic structures is extended into a simulation model for finite, synchronous LSAW and STW resonators. The third part of the thesis concentrates on acoustic loss mechanisms in LSAW resonators on LiTaO3 substrate. The electric losses due to various mechanisms are estimated and discussed. Most importantly, a recently observed acoustic leakage is identified as parasitic excitation of LSAWs to the busbars of the resonator.en
dc.description.versionrevieweden
dc.format.extent37, [53]
dc.format.mimetypeapplication/pdf
dc.identifier.isbn951-22-5338-0
dc.identifier.issn1456-3320
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/2314
dc.identifier.urnurn:nbn:fi:tkk-002591
dc.language.isoenen
dc.publisherHelsinki University of Technologyen
dc.publisherTeknillinen korkeakoulufi
dc.relation.haspartJ. Koskela, V. P. Plessky, and M. M. Salomaa, Suppression of the leaky SAW attenuation with heavy mechanical loading, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 45, 439-449 (1998). DOI: 10.1109/58.660154
dc.relation.haspartJ. Koskela, S. Lehtonen, V. P. Plessky, and M. M. Salomaa, Surface transverse waves on langasite, Applied Physics Letters 72, 2665-2667 (1998). DOI: 10.1109/ULTSYM.1998.762118
dc.relation.haspartJ. Koskela, V. P. Plessky, and M. M. Salomaa, SAW/LSAW COM parameter extraction from computer experiments with harmonic admittance of a periodic array of electrodes, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 46, 806-816 (1999). DOI: 10.1109/58.775644
dc.relation.haspartJ. Koskela, V. P. Plessky, and M. M. Salomaa, Theory for shear horizontal surface acoustic waves in finite synchronous resonators, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 47, 1550-1560 (2000). DOI: 10.1109/58.883544
dc.relation.haspartJ. Koskela, J. V. Knuuttila, P. T. Tikka, C. S. Hartmann, V. P. Plessky, and M. M. Salomaa, Mechanism for acoustic leakage in surface-acoustic wave resonators on rotated Y-cut lithium tantalate substrate, Applied Physics Letters 75, 2683-2685 (1999). DOI: 10.1063/1.125117
dc.relation.haspartJ. Koskela, J. V. Knuuttila, T. Makkonen, V. P. Plessky, and M. M. Salomaa, Acoustic loss mechanisms in leaky SAW resonators on lithium tantalate, Report TKK-F-A801, ISBN 951-22-5142-6, submitted to IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control (2000).
dc.relation.ispartofseriesHelsinki University of Technology publications in engineering physics. Aen
dc.relation.ispartofseries804en
dc.subject.keywordsurface-acoustic waveen
dc.subject.keywordSAW resonatorsen
dc.subject.keywordSAW filtersen
dc.subject.otherphysicsen
dc.titleAnalysis and modeling of surface-acoustic wave resonatorsen
dc.typeG5 Artikkeliväitöskirjafi
dc.type.dcmitypetexten
dc.type.ontasotVäitöskirja (artikkeli)fi
dc.type.ontasotDoctoral dissertation (article-based)en
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local.aalto.digifolderAalto_87685
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