| 摘要 |
The disclosure relates to a novel broadband surface wave acoustic transducer having unidirectional transduction characteristics and to surface wave acoustic devices employing the broadband unidirectional transducer. In the preferred embodiment, the transducer comprises an interdigital electrode arrangement having an electrically conductive common strip meandering through the interdigital spaces of the electrode arrangement. The interdigitally arranged electrodes are spaced in accordance with a repeating series (n + 1/4) lambda , (n + 3/4) lambda , (n + 1/4) lambda , (n + 3/4) lambda . . . , where n is an integer and lambda is an acoustic wavelength. The meandering strip provides a common terminal for the interdigital electrodes so that signals 90 DEG out of phase may be applied between the electrodes and the common terminal.
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