Surface acoustic wave duplexer composed of SiO2 film with convex and concave on Cu-electrodes/LiNbO3 structure

Authors have already realized 3.0times2.5times1.2 or 2.5times2.0times0.48 mm 3 size SAW duplexers for personal communication services in US with an excellent temperature coefficient of frequency (TCF) by using the Rayleigh wave on the SiO 2 /Cu-electrode/ 120deg-128degYX-LiNbO 3 and 36deg-48degYX-Li...

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Bibliographic Details
Main Authors: Nakai, Y., Nakao, T., Nishiyama, K., Kadota, M.
Format: Conference Proceeding
Language:English
Subjects:
Acoustic waves
Cu-electrode
duplexer
Frequency measurement
Optical films
PCS
Personal communication networks
Power measurement
Reflection
SAW
Surface acoustic waves
TCF
Temperature
Transducers
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Summary:Authors have already realized 3.0times2.5times1.2 or 2.5times2.0times0.48 mm 3 size SAW duplexers for personal communication services in US with an excellent temperature coefficient of frequency (TCF) by using the Rayleigh wave on the SiO 2 /Cu-electrode/ 120deg-128degYX-LiNbO 3 and 36deg-48degYX-LiTaO 3 structures. This time, authors intentionally attempted to make the convex portions on the SiO 2 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 SiO 2 film over the gap of the IDTs.
ISSN:1051-0117
DOI:10.1109/ULTSYM.2008.0385