Parameter characterization of high-overtone bulk acoustic resonators by resonant spectrum method

Hui Zhang; Shu-Yi Zhang; Kai Zheng

doi:10.1016/j.ultras.2005.03.003

Parameter characterization of high-overtone bulk acoustic resonators by resonant spectrum method

Ultrasonics. 2005 Aug;43(8):635-42. doi: 10.1016/j.ultras.2005.03.003. Epub 2005 Mar 25.

Authors

Hui Zhang¹, Shu-Yi Zhang, Kai Zheng

Affiliation

¹ Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, PR China. paslabw@nju.edu.cn

PMID: 15982469
DOI: 10.1016/j.ultras.2005.03.003

Abstract

Effects of electrode on high-overtone bulk acoustic resonator (HBAR) spectra are analyzed by numerical simulation. The figure of merit (FOM), the effective electromechanical coupling factor, k(eff)(2)(m), and the quality factor Q(s) of the unique mode are discussed based on the resonance spectra of the HBAR. It is demonstrated that electrodes with proper acoustic impedance and thickness could improve the performance of the HBAR, or degrade the performance if the electrodes are not properly chosen.