3-D electrostatic hybrid element model for SAW interdigital transducers

Carlos F. Jerez-Hanckes, Vincent Laude, Jean Claude Nedelec, Raphael Lardat

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


In this work, the singular behavior of charges at corners and edges on the metallized areas in SAW transducers are investigated. In particular, it is demonstrated that a tensor product of the commonly used Tchebychev bases overestimates the singularities at corners, and, hence, it cannot be used in a proper boundary element method formulation. On the other hand, it is shown that a simple finite element method-like approach is impractical due to the enormous number of unknowns required to model the electrode's large length-to-width ratio. These considerations are then used for defining a hybrid element model, which combines Tchebychev and linear polynomials over differently meshed domains. Such an approach is shown to suitably account for charge singularities while greatly reducing the number of unknowns. Results are obtained for isotropic and anisotropic substrates for non-periodic configurations.

Original languageEnglish
Article number4476376
Pages (from-to)686-695
Number of pages10
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number3
StatePublished - 2008
Externally publishedYes


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