Analytical and experimental study on the second harmonic mode response of a bulk acoustic wave resonator

Wei Pang, Hao Zhang, Richard C. Ruby, Hongyu Yu, Eun Sok Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A one-dimensional Mason model is employed to investigate the second harmonic mode response of a multilayer composite film bulk acoustic resonator (FBAR), particularly the dependence of the effective coupling coefficient (Kt, eff 2) on material properties and relative position in the acoustic stack. The simulation results for AlN-based FBAR with electrode layer having relatively low acoustic impedance and additional temperature compensation layer reveals that the maximum values of Kt,eff 2are obtained with a thickness ratio (between the non-piezoelectric layer and piezoelectric layer) that is close to its acoustic velocity ratio. The fundamental mode and second harmonic mode operation of an FBAR are compared. The maximum achievable Kt,eff 2 is comparable (5.39% versus 5.16%) for the temperature compensated FBAR (with Mo as electrodes) operating at fundamental and second harmonic modes. However, the trimming-mass and crossover temperature sensitivities of the second harmonic mode are lower, indicating its potential advantage over the fundamental mode for high frequency applications above 2 GHz (such as filters, low phase noise temperature stable oscillator applications). Experimental results on a ZnO-based FBAR (Al/ZnO/Al/SixNy) operating around 5 GHz with various thicknesses of ZnO and SixNy show good agreement with numerical modeling.

Original languageEnglish (US)
Article number115015
JournalJournal of Micromechanics and Microengineering
Volume20
Issue number11
DOIs
StatePublished - Nov 2010

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Acoustic resonators
Resonators
Acoustic waves
Temperature
Electrodes
Acoustic impedance
Trimming
Multilayer films
Acoustic wave velocity
Composite films
Phase noise
Materials properties
Acoustics

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Mechanics of Materials
  • Electronic, Optical and Magnetic Materials

Cite this

Analytical and experimental study on the second harmonic mode response of a bulk acoustic wave resonator. / Pang, Wei; Zhang, Hao; Ruby, Richard C.; Yu, Hongyu; Kim, Eun Sok.

In: Journal of Micromechanics and Microengineering, Vol. 20, No. 11, 115015, 11.2010.

Research output: Contribution to journalArticle

Pang, Wei ; Zhang, Hao ; Ruby, Richard C. ; Yu, Hongyu ; Kim, Eun Sok. / Analytical and experimental study on the second harmonic mode response of a bulk acoustic wave resonator. In: Journal of Micromechanics and Microengineering. 2010 ; Vol. 20, No. 11.
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