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Titolo:
First and second order velocity shifts and reflection coefficients for periodic interdigital transducers by boundary condition matching
Autore:
Thoma, C; Hahn, Y;
Indirizzi:
Univ Connecticut, Dept Phys, Storrs, CT 06269 USA Univ Connecticut StorrsCT USA 06269 cut, Dept Phys, Storrs, CT 06269 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSICS
fascicolo: 9, volume: 84, anno: 1998,
pagine: 5163 - 5174
SICI:
0021-8979(19981101)84:9<5163:FASOVS>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACOUSTIC-WAVE REFLECTIONS; COMPREHENSIVE ANALYSIS; SURFACE; PROPAGATION; SCATTERING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Thoma, C Univ Connecticut, Dept Phys, Storrs, CT 06269 USA Univ Connecticut Storrs CT USA 06269 Phys, Storrs, CT 06269 USA
Citazione:
C. Thoma e Y. Hahn, "First and second order velocity shifts and reflection coefficients for periodic interdigital transducers by boundary condition matching", J APPL PHYS, 84(9), 1998, pp. 5163-5174

Abstract

The method of boundary condition matching is utilized to determine reflection coefficients and velocity shifts for surface acoustic wave devices mechanically and electrically loaded by a periodic grating. The method has previously been limited to grooved gratings in isotropic substrates, but is here extended to allow for anisotropic and piezoelectric substrates as well asarbitrary overlay materials which allows for the modeling of metallic electrode interdigital transducers. Upper and lower stop band frequencies are determined by imposing the proper grating boundary conditions. From these frequencies is calculated both first and second order contributions in h/lambda (where h is the grating finger height and lambda the wavelength) to the reflection coefficient and velocity shift due to the loading of the substrate. The presence of the grating also couples the incident surface acoustic waves to evanescent and bulk modes. The attenuation of the incident Rayleigh waves due to bulk mode conversion is discussed as well. Numerical resultsfor some common substrate and overlay materials are given and a comparisonof the relative strengths of the first and second order contributions for specific values of h/lambda is made. Some comparisons with experimental data are also given with good results for sufficiently small h/lambda. (C) 1998 American Institute of Physics. [S0021-8979(98)02719-4].

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Documento generato il 30/11/20 alle ore 20:01:24