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1.发明授权Acoustic surface wave transducer with improved inband frequency characteristics 失效具有改进的频带特性的声学波面传感器
公开(公告)号：EP0044732B1
公开(公告)日：1985-04-24
申请号：EP81303301.6
申请日：1981-07-17
发明人： Chiba, Takao , Sakamoto, Nobuyoshi , Kohro, Kenji
CPC分类号： H03H9/14552 , H03H9/02637 , H03H9/02818 , H03H9/14567 , H03H9/1457
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2.发明公开Acoustic surface wave transducer with improved inband frequency characteristics 失效具有改进的频带特性的声学波面传感器
公开(公告)号：EP0044732A3
公开(公告)日：1982-02-10
申请号：EP81303301
申请日：1981-07-17
发明人： Chiba, Takao , Sakamoto, Nobuyoshi , Kohro, Kenji
IPC分类号： G10K11/36 , H03H09/145
CPC分类号： H03H9/14552 , H03H9/02637 , H03H9/02818 , H03H9/14567 , H03H9/1457
摘要： An acoustic surface wave transducer with a transmission interdigital electrode (2A) and a reception interdigital electrode (2B) on a piezoelectric surface (1) has been improved by reducing the inband dispersion of frequency characteristics by providing an edge-effect canceller (k,), which cancels an undesired surface wave (E-a) which is generated at the external edge of the extreme end finger (11) of the interdigital electrode (10). The edge-effect canceller is constructed so that the length of the extreme end finger (11) is half of the length of the second extreme end finger (12) of the interdigital electrode, and the spacing between the extreme end finger (11) and the second extreme end finger (12) is 1/2 wavelength of the acoustic surface wave. Thus, the phase of the undesired surface wave (E-a) generated by the extreme end finger (11) of the transmission interdigital electrode is opposite to the wave (E-b) generated by the second extreme end finger (12) and the waves are of equal strength. Hence, those surface waves cancel each other as regards effect on the reception interdigital electrode (28), and the inband deviation or dispersion in the amplitude characteristic and/or the group delay characteristic of the transducer is reduced.
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3.发明公开Acoustic surface wave transducer with improved inband frequency characteristics 失效表面具有改善的频率特性的声波换能器。
公开(公告)号：EP0044732A2
公开(公告)日：1982-01-27
申请号：EP81303301.6
申请日：1981-07-17
发明人： Chiba, Takao , Sakamoto, Nobuyoshi , Kohro, Kenji
CPC分类号： H03H9/14552 , H03H9/02637 , H03H9/02818 , H03H9/14567 , H03H9/1457
摘要： An acoustic surface wave transducer with a transmission interdigital electrode (2A) and a reception interdigital electrode (2B) on a piezoelectric surface (1) has been improved by reducing the inband dispersion of frequency characteristics by providing an edge-effect canceller (k,), which cancels an undesired surface wave (E-a) which is generated at the external edge of the extreme end finger (11) of the interdigital electrode (10). The edge-effect canceller is constructed so that the length of the extreme end finger (11) is half of the length of the second extreme end finger (12) of the interdigital electrode, and the spacing between the extreme end finger (11) and the second extreme end finger (12) is 1/2 wavelength of the acoustic surface wave. Thus, the phase of the undesired surface wave (E-a) generated by the extreme end finger (11) of the transmission interdigital electrode is opposite to the wave (E-b) generated by the second extreme end finger (12) and the waves are of equal strength. Hence, those surface waves cancel each other as regards effect on the reception interdigital electrode (28), and the inband deviation or dispersion in the amplitude characteristic and/or the group delay characteristic of the transducer is reduced.
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公开(公告)号：EP0316836B1
公开(公告)日：1995-04-05
申请号：EP88118923.7
申请日：1988-11-14
发明人： Sakamoto, Nobuyoshi , Huor, Ou Hok
IPC分类号： H03H9/64
CPC分类号： H03H9/6423
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公开(公告)号：EP0316836A2
公开(公告)日：1989-05-24
申请号：EP88118923.7
申请日：1988-11-14
发明人： Sakamoto, Nobuyoshi , Huor, Ou Hok
IPC分类号： H03H9/64
CPC分类号： H03H9/6423
摘要： A surface-acoustic-wave device consists of a surface-acoustic-wave filter with a capacitance (C) connected in parallel between its input (21) and output leads (31). The capacitance improves the attenuation characteristic of the device on the high-frequency side of the center frequency.
摘要翻译： 表面声波装置由在其输入（21）和输出引线（31）之间并联连接的电容（C）的表面声波滤波器组成。 电容提高了器件在中心频率的高频侧的衰减特性。
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公开(公告)号：EP0316836A3
公开(公告)日：1990-08-08
申请号：EP88118923.7
申请日：1988-11-14
发明人： Sakamoto, Nobuyoshi , Huor, Ou Hok
IPC分类号： H03H9/64
CPC分类号： H03H9/6423
摘要： A surface-acoustic-wave device consists of a surface-acoustic-wave filter with a capacitance (C) connected in parallel between its input (21) and output leads (31). The capacitance improves the attenuation characteristic of the device on the high-frequency side of the center frequency.
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