| 摘要 |
An acoustic wave filter device includes first to fourth longitudinally coupled resonator type surface acoustic wave filters that are configured such that the first and second longitudinally coupled resonator type surface acoustic wave filters are connected to a first balanced signal terminal, the third and fourth longitudinally coupled resonator type surface acoustic wave filters are connected to a first balanced signal terminal, and a transmission phase of a signal output from the first balanced signal terminal relative to an input signal differs by about 180 degrees with respect to a transmission phase of a signal output from the second balanced signal terminal relative to an input signal. In addition, the number of pairs of electrode fingers of at least one of IDTs of at least one of the first to fourth longitudinally coupled resonator type surface acoustic wave filters is different from the number of pairs of electrode fingers of corresponding IDTs of the remaining first to fourth longitudinally coupled resonator type surface acoustic wave filters.
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