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Two Resonances of Different Nature in STW Resonators With Aperture-Weighted Metallization
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
2015 (English)In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, ISSN 0885-3010, E-ISSN 1525-8955, Vol. 62, no 4, 766-770 p.Article in journal (Refereed) Published
Abstract [en]

In a narrowband 2-port resonator on 37 degrees-cut quartz with Al electrodes (h(Alu) = 100 nm) exploiting surface transverse waves (STW), we have observed parasitic ripples which have been attributed to transverse modes unusually situated on the left side of the main resonance. To suppress these modes, we have used metallization coefficient weighting across the aperture, with more metal in the middle and reduced metallization close to the busbars. The parasitic modes indeed disappeared, but at significantly higher frequency, we have found an additional strong response which does not exist in a resonator with uniform electrode metallization. 3-D simulations showed that the structure has another very different mode, with the wave propagating mainly along the edge of the busbars, but excited with the interdigital electrode system.

Place, publisher, year, edition, pages
2015. Vol. 62, no 4, 766-770 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-253069DOI: 10.1109/TUFFC.2014.006095ISI: 000353120600015PubMedID: 25881353OAI: oai:DiVA.org:uu-253069DiVA: diva2:820106
Available from: 2015-06-11 Created: 2015-05-20 Last updated: 2017-12-04Bibliographically approved

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Yantchev, Ventsislav

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