Title :
Electroacoustic characterisation of +64° and +41° Y-rotated LiNbO3 for wide bandwidth low loss filter design
Author :
Doisy, Martine ; Hodé, Jean-Michel ; Desbois, Jean ; Boyer, Laurent
Author_Institution :
Thomson-Sintra AS, Valbonne, France
Abstract :
Acoustic propagation on metallized surface high-coupling-coefficient 64° and 41° rotated Y-cut LiNbO3 was investigated experimentally and theoretically. A complete set of experimentally determined acoustic parameters in the 0.85-tp-1.6-GHz frequency range is presented. 11.6% and 21% coupling constant values have been deduced from transducer admittance measurement for 64° and 41° LiNbO3 respectively. These data have been applied to the design of 1-GHz image impedance connected low-loss filters. 7% and 10% 3-dB fractional bandwidth was obtained with 8- and 13-dB insertion loss on 64° and 41° LiNbO3, respectively
Keywords :
acoustic microwave devices; band-pass filters; lithium compounds; microwave filters; piezoelectric materials; surface acoustic wave filters; surface acoustic waves; ultrasonic absorption; ultrasonic velocity; 0.85 to 1.6 GHz; 1 GHz; 13 dB; 8 dB; LiNbO3; SAW propagation; Y-rotated substrate; acoustic attenuation; acoustic parameters; acoustic velocity; coupling constant; electroacoustic characterization; fractional bandwidth; image impedance connected low-loss filters; insertion loss; transducer admittance; wide bandwidth low loss filter; Delay lines; Filters; Frequency; Image analysis; Impedance; Metallization; Permittivity measurement; Surface acoustic waves; Surface waves; Wideband;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171404
