title: Optimization of composite transducer designing in high frequency applications.
abstract: The main obstacle to constructing a wide bandwidth and high frequency composite transducer comes from its internal vibration field fluctuation, which is aggravated as frequency increases. We found an optimized structure of 2-2 composite in which the vibration field in both phases remains nearly uniform over a wide frequency range and the piezoelectric coupling coefficient reaches its maximum value simultaneously. This article also proposes a modified representation to calculate more precisely the effective piezoelectric coupling coefficient when the vibration fluctuation has been taken into account.
authors.affiliation: State Key Labs of Modern Acoustics, Nanjing Univ., China.
authors.forename: H
authors.initials: H
authors.lastname: Wu
authors.forename: J
authors.initials: J
authors.lastname: Lin
authors.forename: H
authors.initials: H
authors.lastname: Gao
authors.forename: Y
authors.initials: Y
authors.lastname: Shui
authors.forename: Q
authors.initials: Q
authors.lastname: Xue