ELASTIC WAVE BRANCHING FILTER

摘要

Provided is an elastic wave splitter that is capable of suppressing generation of intermodulation distortion without incurring an increase in size and degradation of insertion loss. An elastic wave splitter (1) has an antenna terminal (3), a transmission terminal (4) and reception terminals (5 and 6). A transmission filter (20) is connected between the antenna terminal (3) and the transmission terminal (4). A reception filter (15) is connected between the antenna terminal (3) and the reception terminals (5 and 6). The transmission filter (20) and the reception filter (15) are each formed of an elastic wave filter. A resonant circuit (34) is connected between the antenna terminal (3) and a ground potential. The resonant circuit (34) includes a surface acoustic wave resonator (35) and a capacitor (C2) connected in series with the surface acoustic wave resonator (35). A resonant frequency of the resonant circuit (34) is positioned in a frequency band of an interference wave that causes intermodulation distortion to be generated.