ELASTIC WAVE FILTER DEVICE

摘要

It is possible to provide an elastic wave filter device capable of improving the balancing degree and reducing the insert loss. The elastic wave filter device includes a first and a second elastic wave filter unit formed on a piezoelectric substrate in such a manner that the first and the second elastic wave filter unit share common balancing terminals. A first balancing I/O terminal shared by the first elastic wave filter unit and the second elastic wave filter unit is is connected to a first balancing terminal while a second balancing I/O terminal shared by the first and the second elastic wave filter unit is connected to a second balancing terminal. The first and the second balancing output terminal of the first elastic wave filter unit are respectively connected to a first and a third elastic wave resonator by a first and a third wire and connected to the first and the second balancing terminal via the third and the third elastic wave resonator. The first and the second balancing output terminal of the second elastic wave filter unit are respectively connected to the first and the second balancing terminal by a second and a fourth wire via a second and a fourth elastic wave resonator. The second wire and the third wire insect each other on the piezoelectric substrate.