| 摘要 |
<p>A balanced acoustic wave filter device with improved balancing is provided. The balanced acoustic wave filter device (1) having a longitudinally coupled resonator type acoustic wave filter (18) formed on a piezoelectric body (2) comprises an unbalanced terminal (11), first and second balanced terminals (12, 13), and an input signal line (31) connecting the unbalanced terminal (11) and the longitudinally coupled resonator type acoustic wave filter (18). The balanced acoustic wave filter device further comprises a shield pattern (32) connected to earth potential and provided between the input signal line (31) and the second balanced terminal (13) so as to insolate the input signal line (31) from the second balanced terminal (13).</p> |
