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1. (WO2014196245) BRANCHING FILTER AND COMMUNICATION MODULE

Pub. No.:    WO/2014/196245    International Application No.:    PCT/JP2014/058989
Publication Date: Fri Dec 12 00:59:59 CET 2014 International Filing Date: Fri Mar 28 00:59:59 CET 2014
IPC: H03H 9/72
H03H 9/145
H03H 9/64
Applicants: KYOCERA CORPORATION
京セラ株式会社
Inventors: NAKAI, Tsuyoshi
仲井 剛
KISHINO, Tetsuya
岸野 哲也
SHIMOZONO, Masahisa
下園 雅久
NISHIMURA, Yuriko
西村 由里子
Title: BRANCHING FILTER AND COMMUNICATION MODULE
Abstract:
A branching filter (1) comprises: an antenna terminal (3) that receives signal waves and disturbance waves; a transmission filter (11) that is connected to the antenna terminal (3); a reception filter (13) that is connected to the antenna terminal (3) and receives some of the signal waves and that has, as passband, a frequency range higher than the passband of the transmission filter (11); and a disturbance wave resonator (15) that is connected to the antenna terminal (3) and also to the ground and positioned closer to the antenna terminal (3) than the transmission filter (11) and the reception filter (13). The disturbance wave resonator (15) is connected to the antenna terminal (3) in such a manner that the disturbance wave resonator (15) is positioned closer to the antenna terminal (3) than the transmission filter (11) and also closer to the antenna terminal (3) than the reception filter (13). The resonance frequency of the disturbance wave resonator (15) is of a frequency range that is smaller than the passband of the transmission filter and that includes the frequency range of the disturbance waves.