Circular interdigital transducers
作者:
S. Barbaid,
J. Duclos,
M. Leduc,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 68,
issue 2
页码: 466-473
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.346816
出版商: AIP
数据来源: AIP
摘要:
The purpose of this article is to establish the focusing properties of a new kind of transducer consisting of circular electrodes deposited on an isotropic substrate and covered by a thin piezoelectric layer. We first express the electromechanical equations of the device and determine its boundary conditions. Then, using the effective dielectric function and an appropriate approximation of the charge density, we obtain various functions (electric potential, displacements) giving a physical description of each medium. Last, we present the numerical results of our study, namely those concerning the displacements and proving the focusing capabilities of our device.
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