公开(公告)号：US20060139125A1

公开(公告)日：2006-06-29

申请号：US10545036

申请日：2004-11-25

申请人： Shigeyuki Shiga-ken ,  Norio Taniguchi

发明人： Shigeyuki Shiga-ken ,  Norio Taniguchi

IPC分类号： H03H9/64

CPC分类号： H03H9/605 ,  H03H9/0557 ,  H03H9/1071 ,  H03H9/1085 ,  H03H9/6483

摘要： In a communication system including a first bandpass filter having a relatively low passband or a second bandpass filter having a relatively high passband, a filter device is used as the first bandpass filter. Series-arm resonators are inserted in a series arm connecting an input terminal and an output terminal. Parallel-arm resonators are connected in parallel arms connecting the series arm and a reference potential. Inductances are connected in series with at least one of the parallel-arm resonators. The resonant frequency of a secondary resonance generated by insertion of the inductances is within or in the vicinity of the passband of the receiver or transmitter bandpass filter serving as a partner filter of the ladder filter.

摘要翻译： 在包括具有较低通带的第一带通滤波器或具有较高通带的第二带通滤波器的通信系统中，使用滤波器装置作为第一带通滤波器。 串联臂谐振器插入连接输入端子和输出端子的串联臂。 并联臂谐振器以连接串联臂和参考电位的并联臂连接。 电感与至少一个并联臂谐振器串联连接。 通过插入电感产生的次级谐振的谐振频率在用作梯形滤波器的伴随滤波器的接收器或发射器带通滤波器的通带内或附近。