Title :
Surface acoustic wave duplexer composed of SiO2 film with convex and concave on Cu-electrodes/LiNbO3 structure
Author :
Nakai, Yasuharu ; Nakao, Takeshi ; Nishiyama, Kenji ; Kadota, Michio
Author_Institution :
Murata Manuf. Co. Ltd., Kyoto
Abstract :
Authors have already realized 3.0times2.5times1.2 or 2.5times2.0times0.48 mm3 size SAW duplexers for personal communication services in US with an excellent temperature coefficient of frequency (TCF) by using the Rayleigh wave on the SiO2/Cu-electrode/ 120deg-128degYX-LiNbO3 and 36deg-48degYX-LiTaO3 structures. This time, authors intentionally attempted to make the convex portions on the SiO2 film over the gap of interdigital transducers (IDTs). As the results, the calculated and measured results showed the increase of the reflection coefficient and the improvement of the TCF. In addition to them, the measured results showed that a power durability have been drastically improved without any deterioration in the frequency characteristics by making the convex portions on the SiO2 film over the gap of the IDTs.
Keywords :
copper; electrodes; interdigital transducers; lithium compounds; multiplexing equipment; personal communication networks; silicon compounds; surface acoustic wave transducers; Rayleigh wave; SiO2-Cu-LiNbO3; SiO2-Cu-LiTaO3; concave; convex; interdigital transducers; personal communication services; reflection coefficient; surface acoustic wave duplexer; temperature coefficient of frequency; Acoustic waves; Frequency measurement; Optical films; Personal communication networks; Power measurement; Reflection; Surface acoustic waves; Temperature; Transducers; Cu-electrode; PCS; SAW; TCF; duplexer;
Conference_Titel :
Ultrasonics Symposium, 2008. IUS 2008. IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2428-3
Electronic_ISBN :
978-1-4244-2480-1
DOI :
10.1109/ULTSYM.2008.0385
