Patent ID: 9184728
Filing Date: 2015-11-10
Classification: H03H

Abstract:
1. 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, 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, is connected to a corresponding first one of a plurality of ground electrodes that are provided on the piezoelectric substrate, 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 different corresponding second one of the ground electrodes provided on the piezoelectric substrate; and the elastic-wave filter device further comprises: