Title :
Characteristics of leaky SAWs on 36-LiTaO3 in periodic structures of heavy electrodes
Author :
Plessky, Victor P. ; Hartmann, C.S.
Author_Institution :
Adv. SAW Products SA, Bevaix
fDate :
31 Oct-3 Nov 1993
Abstract :
Experimental data is presented on leaky surface wave propagation on 36-LiTaO3 with gold and platinum electrodes having a thickness up to 0.04λ. Such heavy electrodes induce a very strong mechanical perturbation of the surface such that very large reflection coefficients are obtained. Reflection coefficients greater than 50% per wavelength (that is per 2 electrodes) and corresponding stopbands (up to 17% relative width) have been observed. The leaky wave attenuation due to the presence of these heavy electrodes is surprisingly low. At 250 MHz, the attenuation is only 2 to 3 higher than when using aluminum electrodes of similar thickness. These COM model parameters are determined using a new technique based on admittance measurements of a one port synchronous resonator
Keywords :
electrodes; gold; lithium compounds; piezoelectric materials; platinum; surface acoustic wave devices; surface acoustic wave filters; surface acoustic waves; 250 MHz; 36-LiTaO3; Au; Au electrode; LiTaO3; Pt; Pt electrode; admittance; heavy electrodes; leaky SAW; leaky wave attenuation; one port synchronous resonator; reflection coefficients; stopbands; Attenuation; Electrodes; Gold; Gratings; Periodic structures; Platinum; Reflection; Reflectivity; Sawing machines; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1993. Proceedings., IEEE 1993
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1993.339609
