| 摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic wave device having satisfactory attenuation characteristics in a high frequency band of a passband with a small insertion loss.SOLUTION: The acoustic wave device includes a first longitudinally-coupled surface acoustic wave filter and a second longitudinally-coupled surface acoustic wave filter having plural IDT electrodes which are tandem-connected to each other. In the plural IDT electrodes of the first longitudinally-coupled surface acoustic wave filter, a first interdigital electrode connected to the input and a second interdigital electrode connected to the output are disposed in a relation of identical phase. In plural IDT electrodes of the second longitudinally-coupled surface acoustic wave filter, a third interdigital electrode connected to the input and a fourth interdigital electrode connected to the output are disposed in a relation of inverse phase. |
