| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an elastic wave device suppressing deterioration of frequency characteristics caused by bulk waves without making the backside of a piezoelectric substrate coarse. <P>SOLUTION: An elastic wave device 10 comprises: (a) a piezoelectric substrate 12 on whose one main surface 12a IDTs 14 and 16 are formed, and through which an elastic wave excited by the IDT 14 propagates; and (b) an additional member 20 joined with the other main surface 12b of the piezoelectric substrate 12. The additional member 20 is configured so that an incidence component, which propagates toward the other main surface 12b of the piezoelectric substrate 12 in the piezoelectric substrate 12 and is incident on the additional member 20 from the other main surface 12b, in the bulk wave excited by the IDT 14 is irregularly reflected within the additional member 20. <P>COPYRIGHT: (C)2012,JPO&INPIT |
