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Résonateurs à domaines ferroélectriques périodiques sur coupes obliques de niobate de lithium pour les applications de filtrage radiofréquences

Abstract : Piezoelectric surface acoustic waves (SAW) and bulk acoustic waves (BAW) filters play a key role in development and performances of mobile telephony. As the mobile phone standards enters its 5th generation (5G), acoustic wave filters must adapt to the expected increase of frequencies. In the 2000s, studies are carried out on piezoelectric components based on periodic poled structures, which allow, due to their architecture, an easier increase of operating frequency. However, these devices, initially made from Z-cut lithium niobate or tantalate, do not fulfill performance requirements for wideband filter applications.In this work, use of lithium niobate oblique cuts for the realization of periodically poled resonators is investigated. A theoretical study, based on finite element simulations, is performed to determine the contribution of the oblique cuts. Fabrication and feasibility of ferroelectric domains on these cuts is then presented. Finally, characterization of resonators made on different lithium niobate cuts is carried out. Increase in the performance of theses devices associated with the use of oblique cuts is demonstrated and paves the way for applications in radiofrequency filtering.
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https://tel.archives-ouvertes.fr/tel-03141526
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Submitted on : Monday, February 15, 2021 - 12:31:21 PM
Last modification on : Wednesday, October 27, 2021 - 7:41:25 AM
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  • HAL Id : tel-03141526, version 1
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Alexandre Matic. Résonateurs à domaines ferroélectriques périodiques sur coupes obliques de niobate de lithium pour les applications de filtrage radiofréquences. Acoustique [physics.class-ph]. Université Bourgogne Franche-Comté, 2020. Français. ⟨NNT : 2020UBFCD048⟩. ⟨tel-03141526⟩

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