| 摘要 |
A surface wave resonator device (10) includes a substrate (12) having a surface layer of piezoelectric material (14), first and second reflective grating structures (16 and 18) and a middle grating structure (40). The middle grating structure includes an odd multiple of one-quarter wavelength for the resonant frequency of the first and second reflective grating structures. The surface acoustic wave transmission velocity of the middle grating structure is substantially equal to the surface acoustic wave transmission velocity of the first and second reflective grating structures. One arrangement includes a surface acoustic wave input transducer (52) and a surface acoustic wave output transducer (58).
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