The propagation characteristics of the layered structure consistingof anSiO2 film on 128rotated Y-cut X-propagating LiNb03 structure are investigated for surface acoustic waves (SAWS). The SiOz fiis are fabricated by radio-frequency (RF) magnetron sputtering techniques. Rayleigh-type waves are excited and detected by conven- tional inter digital transducers (IDT's) fabricated on the LiNbO3 crystal plates. Excellent results have been obtained not only for the tempera- ture characteristics with a temperature coefficient of delay (TCD, of about 0 ppm/C but also for the frequency characteristics with a very small spurious response. Also, the attenuation constant is found to be very small and the layered structure exhibits a high value of electro- mechanical coupling coefficient (K') of about 0.08. The spurious re- sponse characteristics of the layered structure have been investigated theoretically by analyzing the generation of acoustic waves using IDT's and the spurious response is found to be small.
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Yamanouchi et al. (1984) studied this question.
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