公开(公告)号：EP1755217A3

公开(公告)日：2014-02-26

申请号：EP06254163.6

申请日：2006-08-08

申请人： Taiyo Yuden Co., Ltd.

发明人： Nishihara, Tokihiro, c/o Fujitsu Limited ,  Inoue, Shogo, c/o Fujitsu Limited ,  Matsuda, Takashi, c/o Fujitsu Limited ,  Ueda, Masanori, c/o Fujitsu Limited ,  Iwaki, Masafumi, c/o Fujitsu Limited ,  Taniguchi, Shinji, c/o Fujitsu Limited ,  Endo, Go, c/o Fujitsu Media Devices Limited

IPC分类号： H03H9/70 ,  H03H9/60

CPC分类号： H03H9/706 ,  H03H9/605 ,  H03H9/725

摘要： A duplexer includes an antenna terminal (Ant),a first filter (10) connected to the antenna terminal, and a second filter (20) connected to the antenna terminal. At least one of the first filter and the second filter is a ladder type filter in which a parallel resonator (P1, P2, P1', P2') and multiple series resonators (S1-S4, S1'-S4') are included, one or more first inductors (L1, L1') are respectively connected in parallel with one or more series resonators out of the multiple series resonators. The or one such first inductor (L1, L1') is connected in parallel with one of the multiple series resonators that is arranged closest to the antenna terminal.