Theoretical studies on leaky-SAW properties influenced by layers onanisotropic piezoelectric crystals

摘要

Theoretical studies on the behavior of leaky-SAW (LSAW) propertiesnin layered structures were performed. For these calculations rotYX LiTaOn3 and rotYX LiNbO3 LSAW crystal cuts were used,nassuming different layer materials. For LSAWs both the velocity and theninherent loss due to bulk wave emission into the substrate are stronglyninfluenced by distinct layer parameters. As a result, these layernproperties like elastic constants or thickness have shown a strongninfluence on the crystal cut angle of minimum LSAW loss. Moreover, fornsoft and stiff layer materials, a different shift of the LSAW lossnminimum can occur. Therefore, using double-layer structures, the shiftnof the LSAW loss minimum can be influenced by appropriate chosen layersnand ratios