公开(公告)号：US4792939A

公开(公告)日：1988-12-20

申请号：US6171

申请日：1987-01-23

申请人： Mitsutaka Hikita ,  Atsushi Sumioka ,  Yoshikatu Ishida ,  Kunihiro Hamada ,  Yutaka Chiba ,  Yoshio Abe

发明人： Mitsutaka Hikita ,  Atsushi Sumioka ,  Yoshikatu Ishida ,  Kunihiro Hamada ,  Yutaka Chiba ,  Yoshio Abe

IPC分类号： H01Q21/30 ,  H04B1/50 ,  H04B1/56

CPC分类号： H04B1/50 ,  H01Q21/30

摘要： In order to reduce the size of a duplex radio communication transceiver such as a mobile telephone, this transceiver is constructed of a transmitting and receiving duplexer, a filter to be coupled to the duplexer, an amplifier for amplifying a signal received, and a filter to be connected with the output of the amplifier. All the filters are made of acoustic surface wave filters, and all the circuits are mounted on a single metallic substrate and sealed by means of a metallic casing into a module. The transceiver thus constructed has a volume which is one tenth as small as that of the device of the same kind according to the prior art.

摘要翻译： 为了减小诸如移动电话的双工无线电通信收发机的大小，该收发器由发送和接收双工器，要耦合到双工器的滤波器，用于放大接收的信号的放大器和滤波器构成 与放大器的输出连接。 所有滤波器由声表面波滤波器制成，所有电路都安装在单个金属基板上，并通过金属外壳密封成模块。 如此构造的收发器具有根据现有技术的相同类型装置的体积的十分之一的体积。

公开(公告)号：US4734664A

公开(公告)日：1988-03-29

申请号：US844104

申请日：1986-03-26

申请人： Mitsutaka Hikita ,  Atsushi Sumioka ,  Yoshikatu Ishida

发明人： Mitsutaka Hikita ,  Atsushi Sumioka ,  Yoshikatu Ishida

IPC分类号： H03H3/08 ,  H03H9/145 ,  H03H9/25 ,  H03H9/64

CPC分类号： H03H9/6479 ,  H03H9/1455 ,  H03H9/25 ,  H03H9/6463

摘要： In order to realize an SAW filter withstanding high power, a plurality of single open-ended surface acoustic wave resonators are connected in series, and an earth conductor is disposed at least on a part of rear face of a piezoelectric substrate constituting the surface acoustic wave resonators. And static capacities formed between said earth conductor and electrode conductors on the piezoelectric substrate constituting the surface acoustic wave resonators are utilized as constituents of the filter circuit. In the above described structure, a part of input power is not converted into acoustic energy, but directly transmitted to the output side. Since the mechanical stress imposed upon the electrode material and the piezoelectric substrate is thus lightened, the SAW filter can withstand a large power signal.

摘要翻译： 为了实现具有高功率的SAW滤波器，多个单开口声表面波谐振器串联连接，接地导体至少设置在构成声表面波的压电基片的背面的至少一部分上 谐振器。 在构成表面声波谐振器的压电基板上的所述接地导体和电极导体之间​​形成的静电容量被用作滤波器电路的组成部分。 在上述结构中，输入功率的一部分不被转换为声能，而是直接传输到输出侧。 由于施加在电极材料和压电基板上的机械应力因此减轻，所以SAW滤波器可以承受大的功率信号。