| 摘要 |
A surface acoustic wave resonator includes a rotated Y-cut quartz substrate with a cut angle &thetas; of about −53° to about −52° and an IDT electrode made of aluminum or an alloy primarily including aluminum provided on the quartz substrate. The propagation direction of surface acoustic waves is within a range of about 90°±5° with respect to the X axis. A SiO2 film is arranged to cover the quartz substrate and the IDT electrode. The thickness of the IDT electrode is in a range of about 6.0% to about 6.5% of λ, where λ is the wavelength of surface acoustic waves, and the duty ratio of the IDT electrode is in a range of about 0.62 to about 0.66.
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