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Design considerations for tunable bulk acoustic wave resonators based on paraelectric phase BaxSr1-xTiO3 thin films
2010 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Paraelectric phase BaxSr1-xTiO3 (BSTO) is due to the pronounced field induced piezoelectric effect a promising candidate to realize hysteresis-free tunable thin film bulk acoustic wave resonators (TFBARs) at GHz frequencies. Compared to the conventional fixed-frequency TFBAR technology, mainly based on piezoelectric AlN films, the design of tunable BSTO based resonators require additional considerations due to the demanding conditions necessary for the growth of the BSTO active layer (high temperature, O2 ambient). In this work a number of problems and possible solutions are presented for the specific case of solidly mounted resonators based on an acoustic Bragg reflector structure. Simulation results for a proposed tunable resonator based on a BSTO film and a SiO2/HfO2 reflector stack co-optimized for both longitudinal and shear waves are presented and compared to simulations and existing experimental data from other structures.

Place, publisher, year, edition, pages
2010.
Keywords [en]
ferroelectric, microwave, acoustic, resonator
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:umu:diva-140837OAI: oai:DiVA.org:umu-140837DiVA, id: diva2:1150782
Conference
The 19th IEEE International Symposium on the Applications of Ferroelectrics, August 9-12, 2010, Edinburgh, Scotland
Available from: 2017-10-19 Created: 2017-10-19 Last updated: 2018-06-09

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Berge, John

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