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：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：US06781485B2

公开(公告)日：2004-08-24

申请号：US10230061

申请日：2002-08-29

申请人： Yuichi Takamine ,  Minefumi Ouchi

发明人： Yuichi Takamine ,  Minefumi Ouchi

IPC分类号： H03H900

CPC分类号： H03H9/0071 ,  H03H9/0038 ,  H03H9/0042 ,  H03H9/0061 ,  H03H9/0085 ,  H03H9/14582 ,  H03H9/14588

摘要： A surface acoustic wave filter unit having three interdigital transducers arranged along the surface acoustic wave propagation direction is disposed on a piezoelectric substrate. An unbalanced signal terminal and balanced signal terminals are provided for the surface acoustic wave filter unit. At least one of the three interdigital transducers is out of phase relative to the other interdigital transducers. Reflectors are arranged so as to sandwich the three interdigital transducers therebetween. The reflectors are grounded. Thus, a surface acoustic wave filter having a balance-to-unbalance conversion function and having high balance between the balanced signal terminals is achieved.

摘要翻译： 具有沿声表面波传播方向布置的三个叉指式换能器的表面声波滤波器单元设置在压电基板上。 为声表面波滤波器单元提供不平衡信号端子和平衡信号端子。 三个叉指式换能器中的至少一个相对于其他叉指式换能器是异相的。 反射器布置成夹在其间的三个叉指换能器。 反射器接地。 因此，实现了具有平衡 - 不平衡转换功能并且在平衡信号端子之间具有高平衡的表面声波滤波器。

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：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：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。

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。

公开(公告)号：US08736402B2

公开(公告)日：2014-05-27

申请号：US13045587

申请日：2011-03-11

申请人： Yuichi Takamine

发明人： Yuichi Takamine

IPC分类号： H03H9/64 ,  H03H9/145 ,  H03H9/02 ,  H03H9/00

CPC分类号： H03H9/14582 ,  H03H9/0071 ,  H03H9/02535 ,  H03H9/14535 ,  H03H9/6433

摘要： An elastic wave filter device having improved sharpness of filter characteristics includes a longitudinally-coupled resonator-type elastic wave filter section including first to third IDT electrodes each including a plurality of electrode fingers, and first and second reflectors. The first to third IDT electrodes include narrower-pitch portions provided in end portions thereof, which are each adjacent to another IDT electrode in a direction of propagation of elastic waves, each of the narrower-pitch portions having a smaller period of electrode fingers than a period of electrode fingers in the remaining portion of the relevant IDT electrode. The number of electrode fingers in the narrower-pitch portion of the second IDT electrode, which is disposed on the side closer to the first IDT electrode, and the number of electrode fingers in the narrower-pitch portion of the second IDT electrode, which is disposed on the side closer to the third IDT electrode, differ from each other.

摘要翻译： 具有提高的滤波器特性的清晰度的弹性波滤波器装置包括纵向耦合的谐振器型弹性波滤波器部分，其包括每个包括多个电极指的第一至第三IDT电极以及第一和第二反射器。 第一至第三IDT电极包括设置在其端部的窄节距部分，其在弹性波的传播方向上与另一IDT电极相邻，每个较窄的节距部分具有较小的电极指的周期 在相关IDT电极的剩余部分中的电极指的周期。 设置在靠近第一IDT电极的一侧的第二IDT电极的窄节距部分中的电极指的数量和第二IDT电极的窄节距部分中的电极指的数量 设置在更靠近第三IDT电极的一侧彼此不同。

公开(公告)号：US08305160B2

公开(公告)日：2012-11-06

申请号：US13327961

申请日：2011-12-16

申请人： Ayaka Yamamoto ,  Yuichi Takamine

发明人： Ayaka Yamamoto ,  Yuichi Takamine

IPC分类号： H03H9/72 ,  H03H9/64

CPC分类号： H03H9/725 ,  H03H9/0057 ,  H03H9/0085 ,  H03H9/02716 ,  H03H9/02992 ,  H03H9/14573 ,  H03H9/6483

摘要： An elastic wave device includes an unbalanced terminal and first and second balanced terminals. A longitudinally-coupled-resonator-type first elastic wave filter is provided between the unbalanced terminal and the first balanced terminal. An elastic wave filter, which is connected in parallel with the first elastic wave filter, is connected between the unbalanced terminal and the second balanced terminal. The current paths through which IDT electrodes of the elastic wave filters of the elastic wave device are connected to ground terminals, are not symmetrical.

摘要翻译： 弹性波装置包括不平衡端子和第一和第二平衡端子。 在不平衡端子和第一平衡端子之间设置纵向耦合谐振器型第一弹性波滤波器。 与第一弹性波滤波器并联连接的弹性波滤波器连接在不平衡端子和第二平衡端子之间。 弹性波装置的弹性波滤波器的IDT电极与接地端子连接的电流路径不对称。

公开(公告)号：US07876176B2

公开(公告)日：2011-01-25

申请号：US12336563

申请日：2008-12-17

申请人： Yuichi Takamine

发明人： Yuichi Takamine

IPC分类号： H03H9/72 ,  H03H9/64

CPC分类号： H03H9/008 ,  H03H9/0071 ,  H03H9/0085 ,  H03H9/02748 ,  H03H9/725

摘要： An acoustic wave filter device includes first to fourth longitudinally coupled resonator type surface acoustic wave filters that are configured such that the first and second filters are connected to a first balanced signal terminal, the third and fourth filters are connected to a second balanced signal terminal, and a transmission phase of a signal output from the first balanced signal terminal relative to an input signal differs by about 180 degrees with respect to a transmission phase of a signal output from the second balanced signal terminal relative to an input signal. In addition, the number of pairs of electrode fingers of at least one of IDTs of at least one of the first to fourth longitudinally coupled resonator type surface acoustic wave filters is different from the number of pairs of electrode fingers of corresponding IDTs of the remaining first to fourth filters.

摘要翻译： 声波滤波器装置包括第一至第四纵向耦合的谐振器型表面声波滤波器，其被配置为使得第一和第二滤波器连接到第一平衡信号端子，第三和第四滤波器连接到第二平衡信号端子， 相对于从第二平衡信号端子相对于输入信号输出的信号的发送相位，相对于输入信号从第一平衡信号端子输出的信号的发送相位相差大约180度。 此外，第一至第四纵向耦合的谐振器型表面声波滤波器中的至少一个的至少一个IDT的电极指的对数与剩余的第一至第四纵向耦合谐振器型表面声波滤波器的相应IDT的电极指的对数不同 到第四个过滤器。