| 摘要 |
<p>The surface acoustic wave device according to the present invention comprises: a substrate 6); a first inter-digital transducer (7) for transducing an input electric signal to an output surface acoustic wave, which is disposed on the substrate and has a set of first comb-formed electrode fingers (7a); a second inter-digital transducer (8) for transducing the input surface acoustic wave signal to an output electric signal, which is disposed on the substrate and has a set of second comb-formed electrode fingers (8a); wherein the proportion of the width of a finger in the first comb-formed electrode fingers (7a) to the width of the spacing between the adjacent fingers in the first comb-formed electrode fingers can be different from the proportion of the width of a finger in the second comb-formed electrode fingers (8a) to the width of the spacing between the adjacent fingers in the second comb-formed electrode fingers. It is possible to adjust the capacitance component of the input impedance and output impedance by the structure itself of the first and second inter-digital transducers, so that the impedances can be matched with that of outer circuits. As a result, the total size of the surface acoustic wave device can be downsized. <IMAGE></p> |
