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1. 发明授权

US06946932B2 Surface acoustic wave resonator with an interdigital transducer divided into regions having a different fixed pitch 有权
标题翻译：具有叉指换能器的表面声波谐振器被分成具有不同固定间距的区域
公开(公告)号：US06946932B2
公开(公告)日：2005-09-20
申请号：US10679480
申请日：2003-10-07
申请人： Michiaki Takagi , Yoshio Maeda , Takashi Yamazaki , Keigo Iizawa
发明人： Michiaki Takagi , Yoshio Maeda , Takashi Yamazaki , Keigo Iizawa
IPC分类号： H01L41/09 , H01L41/18 , H03H9/02 , H03H9/145 , H03H9/25 , H03H9/64
CPC分类号： H03H9/25 , H03H9/02551 , H03H9/14582
摘要： In a substrate in which a reflection coefficient γ of a surface acoustic wave per electrode is small, the invention obtains a Q value or a CI value level, which is equivalent to or higher than that of a related art product, at a device size which is equivalent to the related art product which addresses the problem that the size of a surface acoustic wave resonator becomes larger. A surface acoustic wave resonator includes one interdigital transducer to excite a surface acoustic wave in a propagation direction x on a piezoelectric plate and a pair of reflectors arranged on both sides thereof in the propagation direction. The interdigital transducer is divided into three regions. The electrode fingers of the interdigital transducer of each region are formed at a fixed pitch which differs within 2%. The surface acoustic wave resonator possesses a single peak response. The form in which a vibration displacement envelope amplitude in the interdigital transducer region is normalized is a form which takes a maximum value 1 at the center position, which smoothly takes a value in a range of 0.33 to 0.53 at a position ¼ from both ends, and which smoothly takes a value in a range of 0.048 to 0.177 at positions at both ends.
摘要翻译：在每个电极的表面声波的反射系数γ小的基板中，本发明以如下装置尺寸获得与现有技术产品相同或更高的Q值或CI值电平相当于解决声表面波谐振器的尺寸变大的问题的现有技术的产品。表面声波谐振器包括一个叉指式换能器，以在压电板上的传播方向x上激发表面声波，并且在传播方向的两侧布置一对反射器。叉指换能器分为三个区域。每个区域的叉指换能器的电极指以固定的间距形成，其在2％内不同。表面声波谐振器具有单峰响应。叉指换能器区域中的振动位移包络振幅被归一化的形式是在中心位置处取最大值1的形式，在两端的位置¼平滑地取0.33〜0.53的范围内的值，并且在两端的位置平滑地获得0.048〜0.177的范围的值。

2. 发明授权

US06384698B1 Transverse double mode saw filter 有权
标题翻译：横向双模锯式过滤器
公开(公告)号：US06384698B1
公开(公告)日：2002-05-07
申请号：US09719836
申请日：2000-12-21
申请人： Satoru Hayashi , Michiaki Takagi , Takashi Yamazaki
发明人： Satoru Hayashi , Michiaki Takagi , Takashi Yamazaki
IPC分类号： H03H964
CPC分类号： H03H9/6479 , H03H9/0028 , H03H9/6463
摘要： A transversally coupled double-mode SAW filter using a surface acoustic wave has two SAW resonators which have curtain-like electrodes and a pair of reflectors on both side thereof, respectively, and which are disposed in parallel on a piezoelectric flat plate in the propagation direction of the surface acoustic wave. The curtain-like electrodes of the SAW resonators have a first bus bar of electrically positive electrode which extends in the propagation direction of SAW and second and third bus bars of electrically negative electrode which extend in parallel on both sides of the first bus bar. The first bus bar has multiple electrode fingers of electrically positive electrode which face the second and third bus bars on both sides thereof and which extend in a direction perpendicular to the propagation direction of SAW so as to suitably have a space of &lgr;/2, &lgr; being the wavelength of the surface acoustic wave, and a width of &lgr;/4. The second and third bus bars have multiple electrode fingers of electrically negative electrode which correspond to the electrode fingers of electrically positive electrode, face the first bus bar and extend in a direction perpendicular to the propagation direction of SAW so as to similarly have a space of &lgr;/2 and a width of &lgr;/4. Thereby, the curtain-like electrodes are constituted to invert the direction of driving field by 180° with the first bus bar therebetween, and to enable making the passband width sharply broader than before by use of the frequency difference between excited primary symmetric mode and primary anti-symmetric mode.
摘要翻译：使用声表面波的横向耦合的双模式SAW滤波器具有两个SAW谐振器，它们分别在其两侧具有帘状电极和一对反射器，并且在传播方向上并联设置在压电平板上的表面声波。 SAW谐振器的帘状电极具有在SAW的传播方向上延伸的电正极的第一母线和在第一母线的两侧平行延伸的电负极的第二和第三母线。第一母线具有电极正极的多个电极指，其两侧面对第二和第三母线，并且在与SAW的传播方向垂直的方向上延伸，以适当地具有lambd / 2，lambd的空间是表面声波的波长，以及lambd / 4的宽度。第二和第三母线具有电负极的多个电极指，其对应于电正极的电极指，面对第一母线并且在垂直于SAW的传播方向的方向上延伸，以类似地具有 lambd / 2和lambd / 4的宽度。由此，帘式电极被构成为将驱动场的方向与其间的第一母线反转180°，并且通过使用被激励的主对称模式与初级对称模式之间的频率差，能够使通带宽度比以前更宽反对称模式。

3. 发明授权

US06335667B1 Multi-longitudinal mode coupled saw filter 有权
标题翻译：多纵向耦合锯式过滤器
公开(公告)号：US06335667B1
公开(公告)日：2002-01-01
申请号：US09529357
申请日：2000-04-13
申请人： Michiaki Takagi , Satoru Hayashi , Takashi Yamazaki
发明人： Michiaki Takagi , Satoru Hayashi , Takashi Yamazaki
IPC分类号： H03H964
CPC分类号： H03H9/6436 , H03H9/1452
摘要： A multi-longitudinal-mode-coupled resonator type SAW filter having flat passband characteristic is provided. In the multi-longitudinal-mode-coupled resonator type SAW filter, an energy trapped type SAW resonator is formed on a frequency upward type piezoelectric substrate, and an IDT is divided into three IDTs, a first IDT arranged to a transmitter side, a second IDT arranged to a receiver side, and a third IDT arranged between the first IDT and the second IDT to control the amplitude of the vibration displacement in two modes for forming a filter. A frequency potential is optimized by changing an electrode period length of each IDT. Resonance amplitude strengths in the two modes are thus equalized and passband transmission characteristics are thus flattened. A filter having a relatively wide bandwidth of 1000 to 1500 ppm is fabricated by using a substrate having a small electromechanical coupling factor, such as a quartz crystal substrate.
摘要翻译：提供具有平坦通带特性的多纵模耦合谐振器型SAW滤波器。在多纵模耦合谐振器型SAW滤波器中，在频率向上型压电基片上形成能量截留型SAW谐振器，IDT分为三个IDT，布置在发送器侧的第一IDT，第二IDT IDT布置在接收器侧，第三IDT布置在第一IDT和第二IDT之间，以控制用于形成滤波器的两种模式中的振动位移的振幅。通过改变每个IDT的电极周期长度来优化频率电位。因此，两种模式中的共振幅度强度被均衡，并且通带传输特性因此变平。通过使用诸如石英晶体衬底的具有小机电耦合因子的衬底来制造具有1000至1500ppm的较宽带宽的滤光器。

4. 发明授权

US6160339A Two-port saw resonator 有权
标题翻译：双口锯片谐振器
公开(公告)号：US6160339A
公开(公告)日：2000-12-12
申请号：US254405
申请日：1999-07-07
申请人： Michiaki Takagi , Takashi Yamazaki
发明人： Michiaki Takagi , Takashi Yamazaki
IPC分类号： H03H9/25 , H01L41/08
CPC分类号： H03H9/25
摘要： To provide a two-port SAW resonator in which spurious responses causes by higher-order vertical inharmonic modes are suppressed, a pair of reflectors and three IDTs are provided on the surface of a piezoelectric plate. The frequency-increase rate of the second and third IDTs is set to be smaller than that of the first IDT so that the frequency-increase rate of the first IDT is 2000 to 12000 ppm. In addition, by setting the number of pairs of the electrodes of the second and third IDTs at 2.75 to 3.75 or a quarter of the number of pairs of the electrodes of all the IDTs, spurious responses caused by higher-order vertical inharmonic modes are suppressed, and equivalent series resistance is reduced to approximately 20.OMEGA.. Therefore, a two-port SAW resonator having a superior frequency stability in a high-frequency band of 500 MHz or higher is realized.
摘要翻译： PCT No.PCT / JP98 / 01569 Sec。 371日期：1999年7月7日 102（e）日期1999年7月7日PCT提交1998年4月3日为了提供一种双端口SAW谐振器，其中由高阶垂直非谐波模式引起的寄生响应被抑制，一对反射器和三个IDT 压电板表面。将第二IDT和第三IDT的频率增加率设定为小于第一IDT的频率增加率，使得第一IDT的增频率为2000〜12000ppm。此外，通过将第二和第三IDT的电极对数设定在2.75至3.75或所有IDT的电极对中的四分之一，抑制由高阶垂直非谐波模式引起的杂散响应，等效串联电阻降低到约20欧米茄。因此，实现了在500MHz以上的高频带中具有优异的频率稳定性的双端口SAW谐振器。

5. 发明申请

US20080018416A1 Resonator Saw Filter 失效
标题翻译：谐振器锯片
公开(公告)号：US20080018416A1
公开(公告)日：2008-01-24
申请号：US11571432
申请日：2005-07-01
申请人： Michiaki Takagi , Katsuro Yoneya , Masahiro Oshio
发明人： Michiaki Takagi , Katsuro Yoneya , Masahiro Oshio
IPC分类号： H03H9/64
CPC分类号： H03H9/0042 , H03H9/02551 , H03H9/02842 , H03H9/14588
摘要： It is aimed to provide a resonator type SAW filter having a relatively wide fractional bandwidth by canceling and decreasing reflection coefficients of electrode fingers each other with a ¼ wavelength electrode in a multi-longitudinal-mode-coupled resonator type SAW filter. The resonator type SAW filter includes, on a piezoelectric substrate, an input interdigital transducer that excites a surface acoustic wave, an output interdigital transducer that receives the surface acoustic wave excited by the input interdigital transducer, a control interdigital transducer interposed between the input interdigital transducer and the output interdigital transducer that controls a state of the surface acoustic wave, and a pair of reflectors arranged on outer sides of both the input interdigital transducer and the output interdigital transducer. And, the input interdigital transducer, the output interdigital transducer, and the control interdigital transducer alternatively arrange two different zones C and E. An electrode period length P is set as PC and a number of pairs MC of the electrode fingers is set to 1 in zone C and the electrode period length P is set as PE and a number of pairs ME of the electrode fingers is set to 1 in zone E on the condition that the electrode period length P as a sum of an electrode finger width L and a spacing S between the electrode fingers is equal to L+S. The electrode fingers in zones C and E are all connected to a feeder conductor. As a result, a multi-longitudinal-mode-coupled resonator type SAW filter having a small insertion loss, and a wide fractional bandwidth of 2000 to 4000 ppm is achieved by canceling and decreasing sums of reflected waves from the electrode fingers in zones C and E, and decreasing the effective reflection coefficient per the electrode finger.
摘要翻译：旨在通过在多纵模耦合谐振器型SAW滤波器中通过用1/4波长电极抵消和减少电极指的反射系数来提供具有相对宽的分数带宽的谐振器型SAW滤波器。谐振器型SAW滤波器在压电基板上包括激励表面声波的输入叉指换能器，接收由输入叉指式换能器激发的表面声波的输出叉指换能器，插入在输入叉指式换能器之间的控制叉指式换能器以及控制声表面波状态的输出叉指换能器，以及布置在输入叉指式换能器和输出叉指式换能器两侧的一对反射器。并且，输入叉指式换能器，输出叉指式换能器和控制叉指式换能器交替地布置两个不同的区域C和E.电极周期长度P设置为PC，并且电极指的对数MC被设置为1 区域C和电极周期长度P被设置为PE，并且在电极周期长度P作为电极指宽度L和间距之和的条件下，区域E中电极指的对数ME被设置为1 电极指之间的S等于L + S。区域C和E中的电极指全部连接到馈线导体。结果，通过在区域C和C中消除和减少来自电极指的反射波的和，实现具有小插入损耗和2000至4000ppm的宽分数带宽的多纵模耦合谐振器型SAW滤波器， E，并且减小每个电极指的有效反射系数。

6. 发明授权

US06937116B2 Longitudinal double-mode saw filter utilizing electrode finger phase weighting 失效
标题翻译：纵向双模锯过滤器利用电极指相加权
公开(公告)号：US06937116B2
公开(公告)日：2005-08-30
申请号：US10774612
申请日：2004-02-10
申请人： Michiaki Takagi , Masahiro Oshio , Satoru Hayashi , Katsuro Yoneya
发明人： Michiaki Takagi , Masahiro Oshio , Satoru Hayashi , Katsuro Yoneya
IPC分类号： H03H9/02 , H03H9/145 , H03H9/25 , H03H9/64
CPC分类号： H03H9/14517 , H03H9/02551 , H03H9/6436
摘要： The invention provides a longitudinal double-mode SAW filter that has a large reflection coefficient by the electrode conductors and having flat pass band characteristics. In the longitudinal double-mode SAW filter, nearly all of higher-order natural mode oscillation displacements A0, S1 and A1 are made present in the first and second interdigital transducer regions. An electrode finger phase weighting is formed to correspond to a BPSK sign where a phase sign changes into 0 or π at a polarity-changing point on an electrode charge distribution function Q(x) that generates on the electrode due to natural modes of oscillation. A single pair of natural modes, which exist stationary in the direction X of propagation of the surface acoustic waves that are utilized, is selected. A symmetrical mode charge distribution (Q(x), −Q(x)) and an obliquely symmetrical mode charge distribution (Q(x), Q(x)) are generated in order to correspond to the regions of IDT1 and IDT2. The PTNG in the control IDT3 region is set to be in the range of 1.02 to 1.04 so as to couple the two together.
摘要翻译：本发明提供了一种纵向双模式SAW滤波器，其通过电极导体具有较大的反射系数，并具有平坦的通带特性。在纵向双模式SAW滤波器中，在第一和第二叉指换能器区域中存在几乎所有的高阶自然模式振荡位移A 0，S 1和A 1。形成电极指相位加权以对应于在自然振荡模式下在电极上产生的电极电荷分布函数Q（x）上的相位符号变为0或pi的BPSK符号。选择在所使用的表面声波的传播方向X上静止的单对自然模式。产生对称模式电荷分布（Q（x），-Q（x））和斜对称模式电荷分布（Q（x），Q（x）），以便对应于IDT 1和IDT 2的区域将控制IDT 3区域中的PTNG设定在1.02〜1.04的范围内，将两者结合在一起。

7. 发明授权

US07579932B2 Resonator SAW filter having a control interdigital transducer between input and output interdigital transducers 失效
标题翻译：谐振器SAW滤波器在输入和输出叉指式换能器之间具有控制叉指式换能器
公开(公告)号：US07579932B2
公开(公告)日：2009-08-25
申请号：US11571432
申请日：2005-07-01
申请人： Michiaki Takagi , Katsuro Yoneya , Masahiro Oshio
发明人： Michiaki Takagi , Katsuro Yoneya , Masahiro Oshio
IPC分类号： H03H9/145 , H03H9/25 , H03H9/64
CPC分类号： H03H9/0042 , H03H9/02551 , H03H9/02842 , H03H9/14588
摘要： A longitudinally coupled multi-mode SAW resonator filter includes input and output interdigital transducers (IDTs) with a control IDT therebetween to control a state of the surface acoustic wave. The input, output, and control IDTs alternatively arrange two different zones C and E having respective electrode period lengths PC and PE, being equal to a sum of the electrode finger width L and spacing S between electrode fingers, and a number of respective pairs MC and ME of electrode fingers is set to 1 in both zones C and E. Electrode fingers in zones C and E are all connected to a feeder conductor. Hence, a filter having small insertion loss, and a wide fractional bandwidth of 2000-4000 ppm is achieved by canceling and decreasing sums of reflected waves from the electrode fingers in zones C and E, and decreasing the effective reflection coefficient per the electrode finger.
摘要翻译：纵向耦合的多模SAW谐振滤波器包括其间具有控制IDT的输入和输出叉指式换能器（IDT），以控制表面声波的状态。输入，输出和控制IDT交替地布置具有相应的电极周期长度PC和PE的两个不同的区域C和E，其等于电极指之间的电极指宽度L和间距S之和以及多个相应的对MC 并且电极指的ME在两个区域C和E中都设置为1.区域C和E中的电极手指都连接到馈线导体。因此，通过抵消和减少来自区域C和E中的电极指的反射波的总和，并且降低每个电极指的有效反射系数，实现了具有小插入损耗和2000-4000ppm的宽分数带宽的滤波器。

8. 发明授权

US5895996A Saw device 失效
标题翻译：锯装置
公开(公告)号：US5895996A
公开(公告)日：1999-04-20
申请号：US647921
申请日：1996-05-29
申请人： Michiaki Takagi , Eishi Momosaki , Yoshinori Ikusaka
发明人： Michiaki Takagi , Eishi Momosaki , Yoshinori Ikusaka
IPC分类号： H03H9/02 , H03H9/145 , H03H9/25 , H01L41/08
CPC分类号： H03H9/25 , H03H9/02543 , H03H9/02551 , H03H9/02834 , H03H9/02858 , H03H9/14547 , H03H9/14594
摘要： A SAW device utilizing elastic surface waves, in which the Q value indicating resonance sharpness is high, and which presents excellent frequency temperature characteristics and short-term frequency stability. In a SAW device according to the present invention, an IDT and two reflectors are in parallel in the propagation direction of the phase of the elastic surface waves. The IDT and reflectors are disposed to cover the power flow direction, which is the propagation direction of energy of the elastic surface waves, whereby the energy of the elastic surface waves is efficiently confined. Moreover, it becomes possible to manufacture the SAW device utilizing a piezoelectric crystal in which angle .theta. and angle .psi. indicating excellent frequency temperature characteristics are 25 to 45 degrees and 40 to 47 degrees, respectively. It is also possible to manufacture the SAW device utilizing a piezoelectric crystal where angle .psi. is related to angle .theta. such that .theta.=2.775.times.(.psi.-32.5)+6.5 where angle .theta. is in the range of 4 to 7 degrees.
摘要翻译： PCT No.PCT / JP95 / 00312 Sec。 371日期：1996年5月29日 102（e）日期1996年5月29日PCT提交1995年2月28日PCT公布。公开号WO96 / 10293 日期1996年4月4日一种利用弹性表面波的SAW器件，其中表示谐振锐度的Q值高，并且具有优异的频率温度特性和短期频率稳定性。在根据本发明的SAW器件中，IDT和两个反射器在弹性表面波的相位的传播方向上是平行的。 IDT和反射器被设置为覆盖作为弹性表面波的能量的传播方向的功率流动方向，由此弹性表面波的能量被有效地限制。此外，可以使用其中分别表示优异的频率温度特性的角度θ和角度psi分别为25至45度和40至47度的压电晶体来制造SAW器件。也可以制造使用角度psi与角度θ相关的压电晶体的SAW器件，使θ= 2.775×（psi-32.5）+ 6.5，其中角度θ在4至7度的范围内。

9. 发明授权

US4468634A Crystal oscillator producing two frequencies by means of amplitude modulation and demodulation 失效
标题翻译：晶体振荡器通过幅度调制和解调产生两个频率
公开(公告)号：US4468634A
公开(公告)日：1984-08-28
申请号：US322319
申请日：1981-11-17
申请人： Michiaki Takagi , Eishi Momosaki
发明人： Michiaki Takagi , Eishi Momosaki
IPC分类号： G01K7/32 , H03B5/36 , H03B25/00
CPC分类号： G01K7/32 , Y10S331/03
摘要： An oscillator circuit for simultaneously outputting two frequency signals comprises a single resonator vibrating in two modes at different frequencies, an amplitude modulating circuit for modulating one of said two frequencies with a third frequency, a feedback circuit receiving the output of the amplitude modulating circuit, a detector demodulating the amplitude modulated signal, the demodulated signal being the third frequency used to modulate the output of the resonator. The two frequencies of the resonator are close together in value and the third frequency signal is the difference in frequency of the two resonator outputs. Circuit outputs are one resonator frequency and the difference frequency.
摘要翻译：用于同时输出两个频率信号的振荡器电路包括以不同频率以两种模式振动的单个谐振器，用于以第三频率调制所述两个频率之一的幅度调制电路，接收幅度调制电路的输出的反馈电路，检测器解调幅度调制信号，解调信号是用于调制谐振器的输出的第三频率。谐振器的两个频率值接近，第三频率信号是两个谐振器输出的频率差。电路输出是一个谐振器频率和差频。

10. 发明授权

US5912602A Surface acoustic wave device and method for designing same using resonators having different frequency-temperature characteristics 失效
标题翻译：表面声波装置及使用具有不同频率 - 温度特性的谐振器进行设计的方法
公开(公告)号：US5912602A
公开(公告)日：1999-06-15
申请号：US731752
申请日：1996-10-18
申请人： Michiaki Takagi , Shigeo Kanna , Eishi Momosaki
发明人： Michiaki Takagi , Shigeo Kanna , Eishi Momosaki
IPC分类号： H03H9/145 , H03H9/02 , H03H9/25 , H03H9/64
CPC分类号： H03H9/6433 , H03H9/02834 , H03H9/14594 , H03H9/6463 , H03H9/14547
摘要： A high-precision surface acoustic wave (SAW) device improves the frequency-temperature characteristics of a conventional surface acoustic wave device several-fold. In this high-precision surface acoustic wave device, two one-port SAW resonators, or two two-port SAW resonators, alternatively, two one-port-resonator-type, two-port-resonator-type or transversal-type filters are placed in parallel with each other. Further, these resonators or filters are excited and are elastically coupled to each other in such a way as to be in an oblique symmetry mode. Moreover, the frequency-temperature characteristics of the two elements are made to differ from each other. Furthermore, a flat frequency-temperature characteristic, which cannot be realized by a single element, is realized by being synthesized from the frequency-temperature characteristics of the two elements.
摘要翻译：高精度表面声波（SAW）器件将常规声表面波器件的频率 - 温度特性提高了几倍。在这种高精度表面声波装置中，放置了两个单口SAW谐振器或两个两端口SAW谐振器，或者两个单端口谐振器型，两端口谐振器型或横向型滤波器彼此平行。此外，这些谐振器或滤波器被激励并且以使其处于倾斜对称模式的方式彼此弹性耦合。此外，使两个元件的频率 - 温度特性彼此不同。此外，通过从两个元件的频率 - 温度特性合成，实现了通过单个元件不能实现的平坦的频率 - 温度特性。

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