| 摘要 |
<p>A surface acoustic wave resonator includes a quartz crystal substrate with Euler angles (-1.5°@phi@1.5°, 117°@theta@142°, and 42.79°@|Psi|@49.57°), and an IDT provided on the quartz crystal substrate that includes a plurality of electrode fingers and excites a stop band upper end mode surface acoustic wave. Inter-electrode finger grooves are provided between the electrode fingers. If a line occupation rate of the convex portions of the quartz crystal substrate disposed between the inter-electrode finger grooves is etag, and a line occupation rate of the electrode fingers disposed on the convex portions is etae, etag>etae and 0.59<etaeff<0.73 are satisfied when an effective line occupation rate etaeff of the IDT is an arithmetic mean of the line occupation rate etag and the line occupation rate etae.</p> |
