DUPLEXER AND COMMUNICATION MODULE

摘要

A branching 1 filter has an antenna terminal 3 which receives signal waves and disturbance waves, a transmission filter 11 which is connected to the antenna terminal 3, a reception filter 13 which is connected to the antenna terminal 3 and receives a portion of the signal waves and has, as a passband, a frequency range higher than a passband of the transmission filter 11, and a disturbance wave resonator which is connected to the antenna terminal 3 and to the ground and positioned closer to the antenna terminal 3 side than the transmission filter 11 and the reception filter 13. The disturbance wave resonator 15 is connected to antenna terminal 3 at a position closer to the antenna terminal 3 side than the transmission filter 11 and the reception filter 13. A resonance frequency of the disturbance wave resonator 15 is within a frequency range smaller than the passband of the transmission filter and includes a frequency range of the disturbance waves.

主权项

1. A duplexer, comprising:
an antenna terminal which receives signal waves and disturbance waves, a transmission filter which is connected to the antenna terminal, a reception filter which is connected to the antenna terminal, and receives a portion of the signal waves, and has a passband of a frequency range higher than a passband of the transmission filter, and a disturbance wave resonator which is connected to the antenna terminal and to a ground and positioned closer to a side of the antenna terminal than the transmission filter and the reception filter, wherein a resonance frequency of the disturbance wave resonator is within a disturbance wave band which is a frequency range smaller than the passband of the transmission filter and which includes a frequency range of the disturbance waves.