Title :
Reflection properties of fast leaky surface acoustic waves on lithium tetraborate
Author :
Gulyaev, Yu.V. ; Grigorievski, V.I.
Author_Institution :
Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, Russia
Abstract :
The dispersion curves of FLSAW propagating along periodic structure of metal electrodes on a lithium tetraborate substrate have been calculated. The calculation method is based on generalized periodic Green´s function approach. The mass and stress loading of electrodes are considered by newly rigorously developed perturbation technique. To investigate the influence of higher order effects the finite element method is applied. It is found that the reflection coefficient in open circuited structure for FLSAW to FLSAW reflection reveals a minimum value as the electrode thickness increases. Contrary to that the reflection coefficient for SAW to SAW reflection increases continuously with the increase of electrode thickness.
Keywords :
Green´s function methods; boundary-value problems; eigenvalues and eigenfunctions; finite element analysis; lithium compounds; periodic structures; surface acoustic waves; ultrasonic reflection; Li2B4O7; boundary conditions; dispersion curves; eigenvalue problem; electrode thickness dependence; fast leaky surface acoustic waves; finite element method; generalized periodic Green´s function; higher order effects; mass loading; metal electrodes; metal gratings; open circuited structure; periodic structure; perturbation technique; reflection properties; stress loading; Acoustic propagation; Acoustic reflection; Acoustic waves; Electrodes; Green´s function methods; Lithium; Periodic structures; Perturbation methods; Stress; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE
Conference_Location :
Caesars Tahoe, NV
Print_ISBN :
0-7803-5722-1
DOI :
10.1109/ULTSYM.1999.849382
