Journal
MICROMACHINES
Volume 14, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/mi14112086
Keywords
single-crystalline lithium tantalate thin film; SM-YBAR; optimized Bragg structure; high electromechanical coupling
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This work proposes a longitudinally excited shear-wave resonator (YBAR) based on single-crystalline lithium tantalate (LiTaO3, LT) thin film, which achieves high effective electromechanical coupling and spurious-free response with the help of an optimized Bragg reflector. This solution has the potential to enable high coupling micro-acoustic resonators with a high Q factor in the 5G/6G communication system.
In this work, a longitudinally excited shear-wave resonator (YBAR) based on single-crystalline lithium tantalate (LiTaO3, LT) thin film is proposed. The YBAR has a 200 nm X-cut thin film and molybdenum electrode. A high effective electromechanical coupling coefficient (k2eff) of up to 19% for the suspension-type structure was obtained. Furthermore, a Bragg reflector (SiO2/Pt) with optimized layer thickness ratio was employed to improve the performance of the YBAR. Compared to the acoustic wave resonators with the conventional quarter-wave (lambda/4) Bragg reflector, the proposed YBAR with an optimized Bragg reflector can reflect both the longitudinal and shear waves efficiently, and resonators with spurious-free response and high quality (Q) value were achieved. This work provides a potential solution to enabling high coupling micro-acoustic resonators with high Q factor in the 5G/6G communication system.
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