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公开(公告)号：EP0786861A1
公开(公告)日：1997-07-30
申请号：EP97101129.1
申请日：1997-01-24
发明人： Taguchi, Yutaka , Eda, Kazuo , Seki, Shunichi , Onishi Keiji
IPC分类号： H03H9/64
CPC分类号： H03H9/6436 , H03H9/0042 , H03H9/1452 , H03H9/25
摘要： A surface acoustic wave filter of the prior art is a filter of the unbalanced type, and has the input and output impedances which are equal to each other , and it is an object of the invention to provide a surface acoustic wave filter which can perform the balanced signal/unbalanced signal conversion, and in which the input and output impedances are different from each other ,and in a surface acoustic wave filter of the longitudinal mode type, a signal is applied to two terminals of the input interdigital transducer, or a signal is output from two terminals of the output interdigital transducer, thereby constituting a balanced type filter , and the apeture length of the input interdigital transducer is different from that of the output interdigital transducer, whereby the input and output impedances are set to be different values.
摘要翻译： 现有技术的表面声波滤波器是不平衡型滤波器，并且具有彼此相等的输入和输出阻抗，并且本发明的目的是提供一种表面声波滤波器，其能够执行 平衡信号/不平衡信号转换，并且其中输入和输出阻抗彼此不同，并且在纵模式类型的表面声波滤波器中，信号被施加到输入叉指式换能器的两个端子或者信号 从输出叉指式换能器的两个端子输出，由此构成平衡型滤波器，并且输入叉指式换能器的焦距与输出叉指式换能器的焦距不同，由此将输入和输出阻抗设置为不同的值。
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公开(公告)号：EP0732805A2
公开(公告)日：1996-09-18
申请号：EP96103673.8
申请日：1996-03-08
发明人： Taguchi, Yutaka , Eda, Kazuo , Onishi, Keiji , Seki, Shunichi
IPC分类号： H03H9/64
CPC分类号： H03H9/64
摘要： To realizing a filter which is capable of properly controlling the passband, and the attenuation pole of a surface acoustic wave filter, a surface acoustic wave filter connected in a ladder type with the surface acoustic wave resonators 104, 105 has an element 106 which changes in capacity by voltage to be impressed and is connected in series with a resonator 105 connected in parallel to the signal line 100.
摘要翻译： 为了实现能够适当地控制通带的滤波器和表面声波滤波器的衰减极点，与梯
形声波谐振器104,105以梯形连接的表面声波滤波器具有元件106， 通过施加电压的电容，并且与并联连接到信号线100的谐振器105串联连接。-
公开(公告)号：EP0698965A1
公开(公告)日：1996-02-28
申请号：EP95112848.7
申请日：1995-08-16
发明人： Onishi, Keiji , Taguchi, Yutaka , Eda, Kazuo , Seki, Shunichi
IPC分类号： H03H9/64
CPC分类号： H03H9/6436 , H03H9/0038 , H03H9/0042 , H03H9/1071 , H03H9/6433
摘要： The present invention provides surface acoustic wave devices which do not require a balanced-to-unbalanced transformer circuit regardless of the type of the peripheral circuits of the balanced type surface acoustic wave filter, i.e. a balanced type device or an unbalanced type. A transmitting interdigital transducer 1 and a receiving interdigital transducer 2 are formed on a substrate comprising 41 ⁰ Y cut-X propagation lithium niobate. A balanced type surface acoustic wave filter 3 is formed on a substrate comprising 36 ⁰ Y cut-X propagation lithium tantalate. The balanced type surface acoustic wave filter 3 comprises two series-arm surface acoustic wave resonators 6 and two crossed-arm surface acoustic wave resonators 7 connected in a lattice. The substrate on which the transmitting interdigital transducer 1 and the receiving interdigital transducer 2 are formed and the substrate on which the balanced type surface acoustic wave filter 3 is formed are located in a ceramic package. One of the input terminals 4 of the transmitting interdigital transducer 1 is grounded. The output terminals 5 of the receiving interdigital transducer 2 are connected to the input terminals 8 of the balanced type surface acoustic wave filter 3.
摘要翻译： 本发明提供了不管平衡型表面声波滤波器的外围电路的类型，即平衡型装置还是不平衡型，都不需要平衡 - 不平衡变压器电路的表面声波装置。 发射叉指式换能器1和接收叉指式换能器2形成在包括41×Y切割-X传播铌酸锂的衬底上。 平衡型表面声波滤波器3形成在包含36×Y切割X传播钽酸锂的基板上。 平衡型表面声波滤波器3包括以格子连接的两个串联臂表面声波谐振器6和两个交叉臂表面声波谐振器7。 其上形成有发送叉指式换能器1和接收叉指式换能器2的衬底和其上形成平衡型表面声波滤波器3的衬底位于陶瓷封装中。 发射叉指式换能器1的一个输入端4接地。 接收叉指式换能器2的输出端5连接到平衡型表面声波滤波器3的输入端8。
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