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State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China





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Academic Editor: Behraad Bahreyni

Abstract Bulk acoustic wave BAW resonators are widely applied in filters and gravimetric sensors for physical or biochemical sensing. In this work, a new architecture of BAW resonator is demonstrated, which introduces a pair of reflection layers onto the top of a thin film bulk acoustic resonator FBAR device. The new device can be transformed between type I and type II dispersions by varying the thicknesses of the reflection layers. A computational modeling is developed to fully investigate the acoustic waves and the dispersion types of the device theoretically. The novel structure makes it feasible to fabricate both type resonators in one filter, which offers an effective alternative to improve the pass band flatness in the filter. Additionally, this new device exhibits a high quality factor Q in the liquid, which opens a possibility for real time measurement in solutions with a superior limitation of detection LOD in sensor applications. View Full-Text

Keywords: BAW resonator; dispersion type; pass band flatness; Q factor in liquid BAW resonator; dispersion type; pass band flatness; Q factor in liquid





Autor: Zhixin Zhang, Ji Liang, Daihua Zhang, Wei Pang * and Hao Zhang

Fuente: http://mdpi.com/



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