公开(公告)号：US20110068881A1

公开(公告)日：2011-03-24

申请号：US12882254

申请日：2010-09-15

申请人： Joji FUJIWARA ,  Tetsuya Tsurunari ,  Hiroyuki Nakamura

发明人： Joji FUJIWARA ,  Tetsuya Tsurunari ,  Hiroyuki Nakamura

IPC分类号： H03H9/64

CPC分类号： H03H9/0038 ,  H03H9/02748

摘要： An acoustic wave filter includes a first IDT electrode, a second IDT electrode, and a third IDT electrode. The first IDT electrode includes a first signal electrode finger connected to the unbalanced terminal, and a first ground electrode finger. The second IDT electrode includes a second signal electrode finger connected to a first balanced terminal, and a second ground electrode finger. The third IDT electrode includes a third signal electrode finger connected to the second balanced terminal, and a third ground electrode finger. A dummy electrode finger connected neither to the unbalanced terminal nor to the ground is provided on the second IDT electrode side in the first IDT electrode. Thus, the degree of balance between balanced terminals can be improved.

摘要翻译： 声波滤波器包括第一IDT电极，第二IDT电极和第三IDT电极。 第一IDT电极包括连接到不平衡端子的第一信号电极指和第一接地电极指。 第二IDT电极包括连接到第一平衡端子的第二信号电极指和第二接地电极指。 第三IDT电极包括连接到第二平衡端子的第三信号电极指和第三接地电极指。 在第一IDT电极的第二IDT电极侧设置有既不连接到不平衡端也不连接到地的虚拟电极指。 因此，可以提高平衡端子之间的平衡度。

公开(公告)号：US20110043428A1

公开(公告)日：2011-02-24

申请号：US12989807

申请日：2009-11-20

申请人： Joji Fujiwara ,  Tetsuya Tsurunari ,  Hiroyuki Nakamura

发明人： Joji Fujiwara ,  Tetsuya Tsurunari ,  Hiroyuki Nakamura

IPC分类号： H03H9/00 ,  H01Q1/50

CPC分类号： H03H9/46 ,  H03H9/725 ,  H04B1/44

摘要： An antenna duplexer includes a transmission filter and a reception filter both coupled with an antenna terminal. A pass band of the transmission filter is lower than a pass band of the reception filter. The transmission filter includes a first series resonator coupled with a first terminal, a second series resonator connected to the first series resonator at a first node, a first parallel resonator connected to a first port of the first series resonator, a second parallel resonator connected to a first node and the first parallel resonator at a second node, a third parallel resonator connected to the first node, a fourth parallel resonator connected to the third parallel resonator at a third node, a first inductance element coupled with the second node and a ground, and a second inductance element coupled with the third node and the ground. The first and second parallel resonators and the first inductance element produce an attenuation pole at a frequency lower than a pass band of the transmission filter. The third and fourth parallel resonators and the second inductance element produce an attenuation pole at a frequency higher than a pass band of the transmission filter. The inductance of the second inductance element is lower than the inductance of the first inductance element. In this antenna duplexer, the transmission filter sufficiently suppresses a spurious caused by harmonics contained in a transmission signal.

摘要翻译： 天线双工器包括与天线端子耦合的发送滤波器和接收滤波器。 发送滤波器的通带低于接收滤波器的通带。 传输滤波器包括与第一端子耦合的第一串联谐振器，在第一节点处连接到第一串联谐振器的第二串联谐振器，连接到第一串联谐振器的第一端口的第一并联谐振器，连接到 在第二节点处的第一节点和第一并联谐振器，连接到第一节点的第三并联谐振器，在第三节点处连接到第三并联谐振器的第四并联谐振器，与第二节点耦合的第一电感元件和地 以及与第三节点和地面耦合的第二电感元件。 第一和第二并联谐振器和第一电感元件在低于发送滤波器的通带的频率处产生衰减极点。 第三和第四并联谐振器和第二电感元件以比传输滤波器的通带高的频率产生衰减极点。 第二电感元件的电感低于第一电感元件的电感。 在该天线双工器中，发送滤波器充分抑制由发送信号中包含的谐波引起的杂波。