| 摘要 |
The surface wave device has at least two transducers applied to the surface of a piezoelectric substrate (2) and at least one reflector structure. A conversion structure (12), extending in the wave propagation direction (x) defined by the transducers, comprises a series of spaced strips (13) outside the surface area used for propagation of the surface waves (8AW) for preventing unwanted wave reflections. The periodic spacing of the strips (13) is defined in terms of the lowest frequency limit of the transmission band, the velocity of the surface waves (SAW) and the velocity of the vol. wave for the highest sound propagation in the material of the substrate (2).
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