| 摘要 |
An acoustic wave resonator utilizing non-leaky acoustic waves is provided. In the acoustic wave resonator, not only is apodization weighting applied such that spurious due to transverse-mode ripple may not be generated but also a Q factor at an anti-resonant frequency and power resistance can be increased and reduction of a chip size and an increase in the degree of freedom in design can be realized. In an acoustic wave resonator 1, an IDT electrode 3 is formed on a piezoelectric substrate 2. The IDT electrode 3 is apodization-weighted such that a plurality of maximum values of cross width are present in acoustic wave propagation directions. Alternatively, in apodization weighting, weighting is applied such that at least one of a pair of envelopes located at outer sides in directions perpendicular to acoustic wave propagation directions includes a plurality of envelope angled portions A1, A2, B1, and B2 angled from the center toward an outer side of the IDT electrode 3 in a direction perpendicular to the acoustic wave propagation directions.
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