Elastic-wave filter device

An elastic-wave filter device comprising:

• an antenna terminal;
• first and second balanced-signal terminals;
• and
• a reception filter section that is connected between the antenna terminal and the first and second balanced-signal terminals;
• wherein
• the reception filter section includes a longitudinally coupled resonator elastic-wave filter section that includes a piezoelectric substrate and a plurality of IDT electrodes provided on the piezoelectric substrate and each of which includes a pair of comb-shaped electrodes;
• among the plurality of IDT electrodes, each of a first comb-shaped electrode of a first IDT electrode including the pair of comb-shaped electrodes, one of which is connected to the first balanced-signal terminal, and a first comb-shaped electrode of a second IDT electrode including the pair of comb-shaped electrodes, one of which is connected to the second balanced-signal terminal, is connected to a corresponding one of a plurality of ground electrodes that are provided on the piezoelectric substrate;
• and
• the elastic-wave filter device further comprises:
• a first elastic-wave resonator that includes the piezoelectric substrate and an IDT electrode which is provided on the piezoelectric substrate and which is connected between a node between the reception filter section and the first balanced-signal terminal and a corresponding one of the ground electrodes;
• a second elastic-wave resonator that includes the piezoelectric substrate and an IDT electrode which is provided on the piezoelectric substrate and which is connected between a node between the reception filter section and the second balanced-signal terminal and a corresponding one of the ground electrodes;
• and
• inductors which are provided on the piezoelectric substrate and each of which is connected between the first comb-shaped electrode of a corresponding one of the first and second IDT electrodes and a corresponding one of the ground electrodes.