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21. 发明授权

US06714099B2 Radio frequency filter, radio frequency circuit, antenna duplexer and radio terminal 失效
标题翻译：射频滤波器，射频电路，天线双工器和无线终端
公开(公告)号：US06714099B2
公开(公告)日：2004-03-30
申请号：US10105446
申请日：2002-03-26
申请人： Mitsutaka Hikita , Nobuhiko Shibagaki , Naoki Matsuura , Kazuyuki Yokoyama , Shigeki Matsuda
发明人： Mitsutaka Hikita , Nobuhiko Shibagaki , Naoki Matsuura , Kazuyuki Yokoyama , Shigeki Matsuda
IPC分类号： H03H954
CPC分类号： H03H9/605 , H03H7/38 , H03H9/0028 , H03H9/0095 , H03H9/588 , H03H9/6483 , H03H9/70
摘要： A radio frequency filter that can be miniaturized is provided. The radio frequency filter has a ladder-type resonator filter, a first terminal, a second terminal, a serial capacitance, a parallel capacitance, a serial inductance, and a parallel inductance. In the ladder-type resonator filter, a plurality of first surface acoustic wave resonators or first film bulk acoustic resonators are connected in a ladder circuit configuration. The serial inductance and the parallel capacitance are connected between the ladder-type resonator filter and the first terminal. The serial capacitance and the parallel inductance are connected between the ladder-type resonator filter and the second terminal.
摘要翻译：提供可以小型化的射频滤波器。射频滤波器具有梯形谐振滤波器，第一端子，第二端子，串联电容，并联电容，串联电感和并联电感。在梯型谐振滤波器中，多个第一表面声波谐振器或第一薄膜体声波谐振器以梯形电路结构连接。串联电感和并联电容连接在梯型谐振滤波器和第一端子之间。串联电容和并联电感连接在梯型谐振滤波器和第二端子之间。

22. 发明授权

US06525624B1 Band-switchable surface acoustic wave antenna duplexer and mobile radio terminal 失效
标题翻译：带可切换声表面波天线双工器和移动无线终端
公开(公告)号：US06525624B1
公开(公告)日：2003-02-25
申请号：US09643769
申请日：2000-08-23
申请人： Mitsutaka Hikita , Nobuhiko Shibagaki , Kazuyuki Sakiyama , Masato Kijima , Osamu Hikino
发明人： Mitsutaka Hikita , Nobuhiko Shibagaki , Kazuyuki Sakiyama , Masato Kijima , Osamu Hikino
IPC分类号： H03H972
CPC分类号： H03H9/725 , H03H7/0161 , H03H7/1708 , H03H7/175 , H03H7/1758 , H03H7/1766 , H03H7/1775 , H03H7/465 , H03H9/0576 , H03H9/72
摘要： A surface acoustic wave antenna duplexer constituted by a transmitter-line filter, a receiver-line filter and an antenna terminal, the transmitter-line filter and the receiver-line filter being connected in parallel with the antenna terminal as a common terminal; wherein at least one of the transmitter-line and receiver-line filters includes a top filter using the whole of a transmitter band or a receiver band as its pass band, a surface acoustic wave resonator filter, and a transmitter or receiver terminal, the top filter, the surface acoustic wave resonator filter and the transmitter or receiver terminal being disposed in this order viewed from the antenna terminal, the surface acoustic wave resonator filter including at least one additive capacitance or inductance; and wherein a switching element is provided for varying a value of the capacitance or inductance so as to provide a function for varying a pass band frequency or an attenuation band frequency of the surface acoustic wave resonator filter.
摘要翻译：由发射机线路滤波器，接收机线路滤波器和天线端子构成的表面声波天线双工器，发射机线路滤波器和接收机线路滤波器作为公共端子与天线端子并联连接; 其中发射机线路和接收机线路滤波器中的至少一个包括使用整个发射机频带或接收机频带作为其通带的顶部滤波器，表面声波谐振器滤波器和发射机或接收机终端，顶部滤波器，表面声波谐振器滤波器以及从天线端子依次设置的发射机或接收机终端，所述表面声波谐振器滤波器包括至少一个附加电容或电感; 并且其中提供开关元件用于改变电容或电感的值，以提供用于改变表面声波谐振器滤波器的通带频率或衰减频带频率的功能。

23. 发明授权

US5666091A Structure of surface acoustic wave filter 失效
标题翻译：表面声波滤波器的结构
公开(公告)号：US5666091A
公开(公告)日：1997-09-09
申请号：US618118
申请日：1996-03-19
申请人： Mitsutaka Hikita , Kazuyuki Sakiyama , Nobuhiko Shibagaki
发明人： Mitsutaka Hikita , Kazuyuki Sakiyama , Nobuhiko Shibagaki
IPC分类号： H03H9/64 , H03H9/72 , H03H9/04
CPC分类号： H03H9/6469 , H03H9/6433 , H03H9/6436 , H03H9/6466
摘要： Without increasing propagation loss or diffraction loss, (unlike conventional surface acoustic wave, SAW, filters which need many electrode finger pairs for constructing interdigital transducers, IDTs, to realize a steep cutoff frequency characteristic by conventional weighting or apodization that involves a high propagation loss and a high diffraction loss), there is provided a SAW filter with a very steep cutoff frequency characteristic on the low frequency side which uses three IDTs having N1, N2 and N3 electrode finger pairs, respectively. The filter is particularly applicable to a mobile radio communication device, such as a cellular radio. The relation between all the number of pairs N1+N2+N3 of the IDTs and the electromechanical coupling coefficient k.sup.2 of the piezoelectric substrate is N2
摘要翻译：（不同于常规表面声波，SAW，需要许多用于构造叉指式换能器的电极指对的滤波器，IDT，通过涉及高传播损耗的常规加权或变迹实现陡峭的截止频率特性，高衍射损耗），提供了在低频侧具有非常陡峭的截止频率特性的SAW滤波器，其使用具有N1，N2和N3电极手指对的三个IDT。该滤波器特别适用于诸如蜂窝无线电的移动无线电通信设备。 IDT的对数N1 + N2 + N3的全部数量与压电基板的机电耦合系数k2之间的关系为N2 <（N1 + N3）<3xN2，2 / k2> / =（N1 + N2 + N3 ）> = 0.8 / k2。

24. 发明授权

US5235234A Surface acoustic wave device 失效
标题翻译：表面声波装置
公开(公告)号：US5235234A
公开(公告)日：1993-08-10
申请号：US785524
申请日：1991-10-31
申请人： Mitsutaka Hikita , Toyoji Tabuchi , Nobuhiko Shibagaki , Atsushi Isobe , Kazuhito Kurosawa
发明人： Mitsutaka Hikita , Toyoji Tabuchi , Nobuhiko Shibagaki , Atsushi Isobe , Kazuhito Kurosawa
IPC分类号： H03H9/145
CPC分类号： H03H9/14502
摘要： A surface acoustic wave device comprises a piezoelectric substrate and a plurality of electrode fingers which are located on the piezoelectric substrate along the propagation direction of a surface acoustic wave. The electrode fingers are located on the piezoelectric substrate at a pitch of about 1.5.lambda.o/2 (where a symbol .lambda.o indicates a wavelength of a surface acoustic wave with a frequency equivalent to the center frequency of the surface acoustic wave device). The width of each of the electrode fingers is about 1.5.lambda.o/4. The electrode fingers are located on the substrate so as to be electrically independent of an external circuit and each other.Since the width of electrode fingers is about 1.5.lambda.o/4, the surface acoustic wave device can be produced without fine processing techniques.
摘要翻译：表面声波装置包括压电基板和沿着声表面波的传播方向位于压电基板上的多个电极指。电极指以约1.5λo/ 2的间距位于压电基板上（其中符号λo表示具有与声表面波装置的中心频率相当的频率的表面声波的波长）。每个电极指的宽度为约1.5λo / 4。电极指位于基板上，以便与外部电路彼此电独立。由于电极指的宽度为约1.5λo / 4，所以可以在没有精细加工技术的情况下制造表面声波装置。

25. 发明授权

US5202652A Surface acoustic wave filter device formed on a plurality of piezoelectric substrates 失效
标题翻译：形成多个压电基板的表面声波滤波器件
公开(公告)号：US5202652A
公开(公告)日：1993-04-13
申请号：US595178
申请日：1990-10-10
申请人： Toyoji Tabuchi , Mitsutaka Hikita , Nobuhiko Shibagaki , Tetsuya Hirashima
发明人： Toyoji Tabuchi , Mitsutaka Hikita , Nobuhiko Shibagaki , Tetsuya Hirashima
IPC分类号： H03H9/145 , H03H9/64
CPC分类号： H03H9/1455 , H03H9/6426 , H03H9/6483
摘要： A surface acoustic wave device is disclosed for use in a communication apparatus where the surface acoustic wave device has a multiple of surface acoustic wave elements with different filter characteristics formed on mutually distinct piezoelectric substrates. The different filter characteristics combine to form filters having desired filter characteristics.

26. 发明授权

US5087901A Surface acoustic wave band-pass filter with different phase weighted transducers 失效
标题翻译：带不同相位称重传感器的表面声波通带滤波器
公开(公告)号：US5087901A
公开(公告)日：1992-02-11
申请号：US490446
申请日：1990-03-08
申请人： Kazuhito Kurosawa , Mitsutaka Hikita , Toyoji Tabuchi , Nobuhiko Shibagaki , Tetsuya Hirashima
发明人： Kazuhito Kurosawa , Mitsutaka Hikita , Toyoji Tabuchi , Nobuhiko Shibagaki , Tetsuya Hirashima
IPC分类号： H03H9/145 , H03H9/64
CPC分类号： H03H9/6426 , H03H9/02748 , H03H9/1455
摘要： At least one electro-acoustic transducer of a first surface acoustic wave device and acousto-electric transducers of a second surface acoustic wave device are arranged symmetrically to the first surface acoustic wave device about a line parallel to a propagating direction of surface acoustic wave and is phase-weighted differently from the remaining transducers having common phase-weighting, to improve an attenuation for stop frequency.

27. 发明授权

US5065065A Surface acoustic wave device 失效
公开(公告)号：US5065065A
公开(公告)日：1991-11-12
申请号：US526508
申请日：1990-05-21
申请人： Mitsutaka Hikita , Toyoji Tabuchi , Nobuhiko Shibagaki , Atsushi Isobe , Kazuhito Kurosawa
发明人： Mitsutaka Hikita , Toyoji Tabuchi , Nobuhiko Shibagaki , Atsushi Isobe , Kazuhito Kurosawa
IPC分类号： H03H9/145
CPC分类号： H03H9/14502
摘要： A surface acoustic wave device comprises a piezoelectric substrate and a plurality of electrode fingers which are located on the piezoelectric substrate along the progagation direction of a surface acoustic wave. The electrode fingers are located on the piezoelectric substrate at a pitch of about 1.5.lambda.o/2 (where a symbol .lambda.o indicates a wavelength of a surface acoustic wave with a frequency equivalent to the center frequency of the surface acoustic wave device). The width of each of the electrode fingers is about 1.5.lambda.o/4. The electrode fingers are located on the substrate so as to be electrically independent of an external circuit and each other.Since the width of electrode fingers is about 1.5.lambda.o/4, the surface acoustic wave device can be produced without fine processing techniques.

28. 发明授权

US4792939A Duplex radio communication transceiver 失效
标题翻译：双工无线电通信收发器
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。

29. 发明授权

US4507581A Electrode structure for saw device 失效
标题翻译：锯装置电极结构
公开(公告)号：US4507581A
公开(公告)日：1985-03-26
申请号：US536521
申请日：1983-09-28
申请人： Toyoji Tabuchi , Mitsutaka Hikita
发明人： Toyoji Tabuchi , Mitsutaka Hikita
IPC分类号： H03H3/08 , H03H9/145 , H03H9/64 , H03H9/25
CPC分类号： H03H3/08 , H03H9/145 , H03H9/6426
摘要： At least two frequencies, one on the higher frequency side and the other on the lower frequency side of a desired frequency, are selected from a predetermined set of frequencies, and stripe widths corresponding to the selected frequencies are combined to realize a desired average stripe width which is used to form an electrode structure of a SAW device. At least one electrode configuration of the SAW device includes an alternate arrangement of electrode stripe and free area stripe and the alternate arrangement is divided into a predetermined number of plural sections within each of which a ratio of the number of stripes of a first width to the number of stripes of a second width is set to a predetermined value. The electrode configuration can be prepared without resort to a highly precise mask and can permit highly precise setting of the center frequencies.
摘要翻译：从预定的频率组中选择至少两个频率，一个在较高频率侧，另一个在所需频率的较低频率侧，并且组合对应于选定频率的条带宽以实现期望的平均条带宽度其用于形成SAW器件的电极结构。 SAW器件的至少一个电极配置包括电极条和自由区域条纹的替代布置，并且替代布置被分成预定数量的多个部分，每个部分中的第一宽度的条带数与将第二宽度的条纹数设置为预定值。电极配置可以在不采用高精度掩模的情况下制备，并且可以允许高精度地设定中心频率。

30. 发明授权

US4365220A Surface wave circuit device 失效
标题翻译：表面波电路器件
公开(公告)号：US4365220A
公开(公告)日：1982-12-21
申请号：US245748
申请日：1981-03-20
申请人： Mitsutaka Hikita
发明人： Mitsutaka Hikita
IPC分类号： H03H3/08 , H03H9/02 , H03H9/145 , H03H9/64 , H03H9/25
CPC分类号： H03H9/643 , H03H9/02771 , H03H9/02881 , H03H9/14517 , H03H9/14567 , H03H9/14547
摘要： Stripes of a transducer or a reflector in a surface acoustic wave device are arranged such that the distribution of effective lengths of interdigital electrodes follows a function of impulse response in the direction of propagation of an acoustic wave and a total number of stripes in the direction of propagation is equal for each section in the direction normal to the direction of propagation, in order to attain a desired frequency response without sacrificing a transfer efficiency.
摘要翻译：表面声波装置中的换能器或反射器的条纹被布置成使得叉指电极的有效长度的分布遵循在声波的传播方向上的脉冲响应的方向和沿着在与传播方向垂直的方向上的每个部分的传播相等，以便在不牺牲传送效率的情况下获得期望的频率响应。

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