Surface acoustic wave device and branching filter

摘要

A surface acoustic wave device is provided with an input signal electrode 15 and an output signal electrode 16 to and from which an electric signal is inputted or outputted; a first surface acoustic wave resonator 18 including an input terminal 18 a connected to the input signal electrode 15 and having a plurality of comb electrodes, an output terminal 18 b connected to the output signal electrode 16 and having a plurality of comb electrodes, a common terminal 18 c which has a plurality of comb electrodes and which forms interdigital transducers A and B together with the comb electrodes of the input terminal 18 a and the comb electrodes of the output terminal 18 b; and a second surface acoustic wave resonator 19 connected between the common terminal 18 c of the first surface acoustic wave resonator 18 and a pair of grounding terminals 17.