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    Surface acoustic wave device and communication apparatus utilizing a resonator with a dummy electrode
    2.
    发明授权
    Surface acoustic wave device and communication apparatus utilizing a resonator with a dummy electrode 有权
    表面声波装置和利用具有虚拟电极的谐振器的通信装置

    公开(公告)号：US06828878B2

    公开(公告)日：2004-12-07

    申请号：US10367257

    申请日：2003-02-14

    申请人： Yuichi Takamine ,  Yoichi Sawada

    发明人： Yuichi Takamine ,  Yoichi Sawada

    IPC分类号： H03H964

    CPC分类号： H03H9/008 ,  H03H9/0038 ,  H03H9/0042 ,  H03H9/0061 ,  H03H9/0071 ,  H03H9/0085 ,  H03H9/02866 ,  H03H9/14582 ,  H03H9/14588 ,  H03H9/14591 ,  H03H9/6436 ,  H03H9/6469

    摘要： A surface acoustic wave (SAW) device includes at least one longitudinally coupled resonator SAW filter and at least one SAW resonator connected in series to the SAW filter on a piezoelectric substrate. The SAW resonator is arranged such that the resonant frequency is located within the pass band of the SAW filter and the antiresonant frequency is located outside the pass band of the SAW filter. A dummy electrode is provided between an electrode finger and a bus bar of an interdigital transducer (IDT) of the SAW resonator. The gap between the dummy electrode and the electrode finger of the IDT is about 0.5&lgr; or less when the wavelength determined by the pitch between the electrode fingers of the interdigital transducers of the SAW resonator is indicated by &lgr;.

    摘要翻译： 表面声波（SAW）器件包括至少一个纵向耦合的谐振器SAW滤波器和至少一个与压电衬底上的SAW滤波器串联连接的SAW谐振器。 SAW谐振器被布置成使得谐振频率位于SAW滤波器的通带内，并且反谐振频率位于SAW滤波器的通带外。 哑电极设置在SAW谐振器的叉指式换能器（IDT）的电极指和汇流条之间。 当由SAW谐振器的叉指式换能器的电极指的间距确定的波长由λ表示时，IDT的虚拟电极和电极指之间的间隙为约0.5λ或更小。

    Surface acoustic wave filter device with an unbalanced-to-balanced conversion function
    5.
    发明授权
    Surface acoustic wave filter device with an unbalanced-to-balanced conversion function 有权
    具有不平衡平衡转换功能的表面声波滤波器

    公开(公告)号：US06731188B2

    公开(公告)日：2004-05-04

    申请号：US10087800

    申请日：2002-03-05

    申请人： Yoichi Sawada ,  Yuichi Takamine

    发明人： Yoichi Sawada ,  Yuichi Takamine

    IPC分类号： H03H964

    CPC分类号： H03H9/6436 ,  H03H9/0071 ,  H03H9/0085 ,  H03H9/14582

    摘要： A surface acoustic wave filter device, having a balanced-to-unbalanced conversion function, in which input/output impedances are different and in which the in-band degree of balance is satisfactory, is obtained. The surface acoustic wave filter device has a balanced-to-unbalanced conversion function, in which the spacing of input/output IDTs of a second surface acoustic wave filter element is larger by approximately half the wavelength of the surface-acoustic wave than that of a first surface acoustic wave filter element so that the phase is inverted, wherein the total of the electrostatic capacitance values of a plurality of IDTs of the second surface acoustic wave filter element is larger than the total of the electrostatic capacitance values of a plurality of IDTs of the first surface acoustic wave filter element.

    摘要翻译： 获得具有平衡不平衡转换功能的表面声波滤波器装置，其中输入/输出阻抗不同，并且带内平衡度令人满意。 表面声波滤波器装置具有平衡不平衡转换功能，其中第二声表面波滤波器元件的输入/输出IDT的间隔比表面声波滤波器元件的波长的大约一半大于 第一表面声波滤波器元件，使得相位反转，其中第二声表面波滤波器元件的多个IDT的静电电容值的总和大于多个IDT的静电电容值的总和 第一表面声波滤波器元件。

    Surface acoustic wave filter device
    6.
    发明授权
    Surface acoustic wave filter device 有权
    表面声波滤波装置

    公开(公告)号：US06710676B2

    公开(公告)日：2004-03-23

    申请号：US10043133

    申请日：2002-01-14

    申请人： Masaru Yata ,  Kazunobu Shimoe ,  Yoichi Sawada ,  Hiroki Watanabe ,  Yuichi Takamine

    发明人： Masaru Yata ,  Kazunobu Shimoe ,  Yoichi Sawada ,  Hiroki Watanabe ,  Yuichi Takamine

    IPC分类号： H03H964

    CPC分类号： H03H9/0061 ,  H03H9/0042 ,  H03H9/0071 ,  H03H9/14591

    摘要： A surface acoustic wave filter device has a balance-unbalance conversion function and substantially equal input impedance and output impedance so as to increase out-of-passband attenuation. The surface acoustic wave filter device includes an unbalanced signal terminal, first and second balanced signal terminals, and first and second surface acoustic wave filters having input and output impedances. In each filter, one of the input and output impedances is approximately four times the other impedance. Additionally, 2n−1 first surface acoustic wave filters are connected between the unbalanced signal terminal and the first balanced signal terminal, and 2n−1 second surface acoustic wave filters are connected between the unbalanced signal terminal and the second balanced signal terminal, where n is an integer of 1 or more. The second surface acoustic wave filters are 180 degrees out-of-phase with respect to the first surface acoustic wave filters.

    摘要翻译： 表面声波滤波器装置具有平衡不平衡转换功能和基本相等的输入阻抗和输出阻抗，以便增加通带衰减。 表面声波滤波器装置包括不平衡信号端子，第一和第二平衡信号端子以及具有输入和输出阻抗的第一和第二声表面波滤波器。 在每个滤波器中，输入和输出阻抗之一约为另一个阻抗的四倍。 另外，2 第一声表面波滤波器连接在不平衡信号端子和第一平衡信号端子之间，并且2 第二声表面波滤波器连接在不平衡信号端子和第二平衡信号端子之间 信号端子，其中n是1或更大的整数。 第二声表面波滤波器相对于第一声表面波滤波器是180度异相。

    Surface acoustic wave device and communication device
    7.
    发明授权
    Surface acoustic wave device and communication device 有权
    声表面波装置及通讯装置

    公开(公告)号：US06998760B2

    公开(公告)日：2006-02-14

    申请号：US10269368

    申请日：2002-10-12

    申请人： Osamu Shibata ,  Yoichi Sawada

    发明人： Osamu Shibata ,  Yoichi Sawada

    IPC分类号： H03H9/145 ,  H03H9/25

    CPC分类号： H03H9/0028 ,  H03H9/0085

    摘要： A surface acoustic wave device includes at least four surface acoustic wave elements that are arranged to have an unbalanced-to-balanced conversion function. In a surface acoustic wave element on the balanced side, the phase between the input and output terminals is 180 degrees shifted so that the phase difference between the outputs on the balanced side becomes substantially 180 degrees.

    摘要翻译： 表面声波装置包括至少四个被布置成具有不平衡平衡转换功能的表面声波元件。 在平衡侧的表面声波元件中，输入端子和输出端子之间的相位为180度偏移，使得平衡侧的输出端之间的相位差变为大致180度。

    Surface acoustic wave filter apparatus having different structure reflectors
    8.
    发明授权
    Surface acoustic wave filter apparatus having different structure reflectors 有权
    表面声波滤波装置具有不同的结构反射器

    公开(公告)号：US06891451B2

    公开(公告)日：2005-05-10

    申请号：US10123452

    申请日：2002-04-17

    申请人： Yoichi Sawada

    发明人： Yoichi Sawada

    IPC分类号： H03H9/00 ,  H03H9/145 ,  H03H9/64

    CPC分类号： H03H9/0071 ,  H03H9/0085

    摘要： A surface acoustic wave filter apparatus includes extensional-coupling-resonator-mode first through fourth SAW filter devices which are disposed on a piezoelectric substrate. Each SAW filter device includes three interdigital transducers (IDTs) arranged in a SAW propagating direction, and reflectors arranged such that they sandwich the IDTs therebetween. The SAW filter devices have a balanced-to-unbalanced input/output function. The reflectors of the first and second SAW filter devices are different from those of the third and fourth SAW filter devices in at least one of the number, the pitch, the duty, and the thickness of the electrode fingers of the reflectors.

    摘要翻译： 一种表面声波滤波器装置，其包括设置在压电基板上的延伸耦合谐振器模式的第一至第四SAW滤波器装置。 每个SAW滤波器装置包括以SAW传播方向布置的三个叉指式换能器（IDT），并且布置成使得它们夹在其间的IDT的反射器。 SAW滤波器器件具有平衡到不平衡的输入/输出功能。 第一和第二SAW滤波器装置的反射器在反射器的电极指的数量，间距，占空比和厚度中的至少一个中与第三和第四SAW滤波器装置的反射器不同。

    Surface acoustic wave apparatus
    9.
    发明授权
    Surface acoustic wave apparatus 有权

    公开(公告)号：US07053733B2

    公开(公告)日：2006-05-30

    申请号：US10271777

    申请日：2002-10-17

    申请人： Masaru Yata ,  Yoichi Sawada

    发明人： Masaru Yata ,  Yoichi Sawada

    IPC分类号： H03B9/64

    CPC分类号： H03H9/0061

    摘要： A surface acoustic wave apparatus includes a piezoelectric substrate mounting a surface acoustic wave filter having a plurality of comb-like electrode sections, and another surface acoustic wave filter also having a plurality of comb-like electrode sections, in a manner such that a balun function is obtained. Further, a wiring pattern is provided on the piezoelectric substrate for a connecting reference terminal side electrode of a comb-like electrode section with a reference terminal side electrode of another comb-like electrode section. Moreover, another wiring pattern is provided on the piezoelectric substrate for connecting a reference terminal side electrode of a further comb-like electrode section with a reference terminal side electrode of a still further comb-like electrode section.

    Surface acoustic wave apparatus using filters with overlapped propagation paths and communications unit
    10.
    发明授权
    Surface acoustic wave apparatus using filters with overlapped propagation paths and communications unit 有权
    使用具有重叠传播路径和通信单元的滤波器的表面声波装置

    公开(公告)号：US06693501B2

    公开(公告)日：2004-02-17

    申请号：US10092604

    申请日：2002-03-08

    申请人： Yoichi Sawada ,  Hiroshi Takasaki

    发明人： Yoichi Sawada ,  Hiroshi Takasaki

    IPC分类号： H03H964

    CPC分类号： H03H9/0071 ,  H03H9/0085 ,  H03H9/02866

    摘要： In a surface acoustic wave (SAW) apparatus, a first SAW filter device and a second SAW filter device are disposed on a piezoelectric substrate such that their respective propagation paths overlap. When the center-to-center distance between the first and second SAW filter devices are indicated by d1, and when the thickness of the piezoelectric substrate is indicated by t, the first and second SAW filter devices and the piezoelectric substrate are arranged so as to satisfy the condition d1≦2.3×t or d1≧2.8×t.

    摘要翻译： 在表面声波（SAW）装置中，第一SAW滤波器装置和第二SAW滤波器装置设置在压电基片上，使得其各自的传播路径重叠。 当第一和第二SAW滤波器件之间的中心到中心距离由d1表示时，当压电基片的厚度由t表示时，第一和第二SAW滤波器件和压电基片被布置成 满足条件d1 <= 2.3XT OR D1> = 2.8xt。