| 摘要 |
A surface acoustic wave transducer comprises a piezoelectric substrate, a first comb-shaped electrode with strips having the same width of lambda /8 ( lambda is the wavelength of a surface acoustic wave), and a second comb-shaped electrode with strips having the same width of lambda /8. The strips of these comb-shaped electrodes are spaced apart from each other for a distance of lambda /8. The strips of either electrode form pairs. Of each pair of strips, one strip has a narrow portion having a width of lambda /16 and the other strip has a broad portion having a width of 3 lambda /16, which extends along the narrow portion. The narrow and broad portions of the strips of either comb-shaped electrode both acoustically and electrically reflect surface acoustic waves, whereas the other portions of the strips only electrically reflect the waves.
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