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。

公开(公告)号：US06815868B2

公开(公告)日：2004-11-09

申请号：US10118358

申请日：2002-04-09

申请人： Osamu Shibata ,  Yuichi Takamine ,  Hiroki Watanabe ,  Masaru Yata ,  Yoichi Sawada

发明人： Osamu Shibata ,  Yuichi Takamine ,  Hiroki Watanabe ,  Masaru Yata ,  Yoichi Sawada

IPC分类号： H03H925

CPC分类号： H03H9/008 ,  H03H9/0038 ,  H03H9/0042 ,  H03H9/0061 ,  H03H9/0071 ,  H03H9/0085 ,  H03H9/02748 ,  H03H9/14517 ,  H03H9/14532 ,  H03H9/14547 ,  H03H9/14576 ,  H03H9/14579 ,  H03H9/14582 ,  H03H9/14585 ,  H03H9/14588 ,  H03H9/14591 ,  H03H9/6436

摘要： A surface acoustic wave apparatus includes three longitudinally-coupled-resonator-type interdigital transducers (IDTs) having a balanced-to-unbalanced conversion function, which are provided on a piezoelectric substrate in a direction in which a surface acoustic wave (SAW) propagates. Weighting is applied to at least one of the IDTs. For example, among the electrode fingers of the IDT located on the left side, an apodization-weighted electrode finger is provided for one of the electrode fingers positioned adjacent to the central IDT.

摘要翻译： 声表面波装置包括三个具有平衡不平衡转换功能的纵向耦合谐振器型叉指式换能器（IDT），它们在表面声波（SAW）传播的方向上设置在压电基片上。 加权被应用于至少一个IDT。 例如，在位于左侧的IDT的电极指中，设置与位于中央IDT相邻的电极指之一的变迹加重电极指。

公开(公告)号：US07034639B2

公开(公告)日：2006-04-25

申请号：US10832870

申请日：2004-04-27

申请人： Yuichi Takamine ,  Yoichi Sawada ,  Minefumi Ouchi

发明人： Yuichi Takamine ,  Yoichi Sawada ,  Minefumi Ouchi

IPC分类号： H03H9/64 ,  H03H9/72

CPC分类号： H03H9/0061 ,  H03H9/0042 ,  H03H9/0057 ,  H03H9/0085 ,  H03H9/14582 ,  H03H9/14588

摘要： A longitudinally coupled resonator type surface acoustic wave filter having a balance-unbalance conversion function achieves improved amplitude balance and phase balance. The surface acoustic wave filter includes first, second and third IDTs. The second IDT is positioned in the center of the three IDTs and has an even number of electrode fingers. The polarity of the electrode finger of the first IDT adjacent to the second IDT is opposite to the polarity of the electrode finger of the third IDT adjacent to the second IDT.

摘要翻译： 具有平衡不平衡转换功能的纵向耦合谐振器型表面声波滤波器实现了改善的幅度平衡和相位平衡。 表面声波滤波器包括第一，第二和第三IDT。 第二IDT位于三个IDT的中心，并且具有偶数个电极指。 与第二IDT相邻的第一IDT的电极指的极性与与第二IDT相邻的第三IDT的电极指的极性相反。

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。

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.

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。

公开(公告)号：US06781478B2

公开(公告)日：2004-08-24

申请号：US09886083

申请日：2001-06-21

申请人： Yuichi Takamine ,  Yoichi Sawada ,  Minefumi Ouchi

发明人： Yuichi Takamine ,  Yoichi Sawada ,  Minefumi Ouchi

IPC分类号： H03H972

CPC分类号： H03H9/0061 ,  H03H9/0042 ,  H03H9/0057 ,  H03H9/0085 ,  H03H9/14582 ,  H03H9/14588

摘要： A longitudinally coupled resonator type surface acoustic wave filter having a balance-unbalance conversion function achieves improved amplitude balance and phase balance. The surface acoustic wave filter includes first, second and third IDTs. The second IDT is positioned in the center of the three IDTs and has an even number of electrode fingers. The polarity of the electrode finger of the first IDT adjacent to the second IDT is opposite to the polarity of the electrode finger of the third IDT adjacent to the second IDT.

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。

公开(公告)号：US06744333B2

公开(公告)日：2004-06-01

申请号：US10379721

申请日：2003-03-06

申请人： Yoichi Sawada

发明人： Yoichi Sawada

IPC分类号： H03H972

CPC分类号： H03H9/0071 ,  H03H9/0038 ,  H03H9/008 ,  H03H9/0085 ,  H03H9/0576 ,  H03H9/1071 ,  H03H9/6433 ,  H03H9/72 ,  H03H9/725 ,  H03H2250/00

摘要： A surface acoustic wave filter device includes a piezoelectric substrate, and first and second surface acoustic wave filter elements disposed on the piezoelectric substrate. Each of the surface acoustic wave filters has a plurality of IDTs disposed along the surface acoustic wave propagation direction. The first and second surface acoustic wave filter elements are arranged such that they are substantially equal in transmission amplitude characteristic within a band but different in transmission phase characteristic by about 180°. One end of each of the first and second surface acoustic wave filter elements define an unbalanced terminal, and the other end of each of the first and second surface acoustic wave filter elements define a balanced terminal.

摘要翻译： 声表面波滤波器装置包括压电基片和设置在压电基片上的第一和第二声表面波滤波器元件。 每个声表面波滤波器具有沿声表面波传播方向设置的多个IDT。 第一和第二表面声波滤波器元件被布置成使得它们在带内的传输幅度特性中基本相等，但在传输相位特性上差不多约180°。 第一和第二表面声波滤波器元件中的每一个的一端限定不平衡端子，并且第一和第二表面声波滤波器元件中的每一个的另一端限定平衡端子。

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。