Abstract
It has been reported by R. C. M. Li and J. Melngailis [IEEE Trans. Sonics Ultrason. SU‐22 (3), 189–198 (1975)] that a metal strip array on Y‐Z LiNbO3 shows a strong reflection of the surface acoustic wave (SAW) at the frequency of the second harmonic component due to the energy storage effect. To apply this properly to reflectors for a SAW resonator, the following characteristics for both shorted and open metal strip arrays on LiNbO3 (128° rot. Y, X‐prop.) have been experimentally investigated. The dependence of the second harmonic reflection coefficient on the metalization ratio and the comparison between the reflection coefficient for the second harmonic and the fundamental frequency regions have been examined in detail. The relations between the frequency at which the maximum reflection coefficient occurs and the center frequency of an interdigital transducer (IDT) have also been determined. The characteristics obtained here are useful for the optimum design of second harmonic, one‐ and two‐port resonators.
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