公开(公告)号：US09998098B2

公开(公告)日：2018-06-12

申请号：US15290079

申请日：2016-10-11

申请人： Murata Manufacturing Co., Ltd.

发明人： Toshiaki Takata

IPC分类号： H03H9/64 ,  H03H9/72 ,  H03H9/70 ,  H03H9/05 ,  H03H9/54

CPC分类号： H03H9/725 ,  H03H9/0576 ,  H03H9/54 ,  H03H9/6433 ,  H03H9/6476 ,  H03H9/6483 ,  H03H9/6493 ,  H03H9/70

摘要： A band pass filter includes a longitudinally coupled resonator elastic wave filter on a piezoelectric substrate and parallel arm resonators at parallel arms, each connected between a series arm connecting an antenna terminal and a receiving terminal and one of ground terminals. The parallel arm resonators include a first parallel arm resonator having the highest resonance frequency among the parallel arm resonators and a second parallel arm resonator. A second ground terminal that is one of the ground terminals connected to the second parallel arm resonator and a third ground terminal that is one of the ground terminals connected to the longitudinally coupled resonator elastic wave filter are connected to each other. A first ground terminal that is one of the ground terminals connected to the first parallel arm resonator is not connected to the second or third ground terminals.

公开(公告)号：US20160094200A1

公开(公告)日：2016-03-31

申请号：US14863518

申请日：2015-09-24

申请人： WISOL CO., LTD.

发明人： Kyung Sik KIM ,  Woo Hyun KIM

IPC分类号： H03H9/64

CPC分类号： H03H9/6456 ,  H03H9/02992 ,  H03H9/6493

摘要： A SAW filter in which a plurality of IDT electrodes is disposed in the propagation direction of a SAW and ground terminals are separated. The present invention has an advantage in that the attenuation effect of the SAW filter is improved. Furthermore, a skirt characteristic on the high frequency side of a transmission stage and a skirt characteristic on the low frequency side of a reception stage can be improved. Furthermore, an equivalent pass band characteristic can be achieved and a skirt characteristic on the high frequency side and a skirt characteristic on the low frequency side can be improved. Furthermore, the number of bridge electrodes can be reduced and thus a process can be simplified because ground terminals are separated.

摘要翻译： 分离在SAW的传播方向上设置多个IDT电极的SAW滤波器和接地端子。 本发明具有SAW滤波器的衰减效果提高的优点。 此外，可以提高在发送级的高频侧的裙部特性和在接收台的低频侧的裙部特性。 此外，可以实现等效的通带特性，并且可以提高高频侧的裙部特性和低频侧的裙部特性。 此外，可以减少桥电极的数量，因此可以简化接地端子分离的过程。

公开(公告)号：US09184728B2

公开(公告)日：2015-11-10

申请号：US14096046

申请日：2013-12-04

申请人： Murata Manufacturing Co., Ltd.

发明人： Yuichi Takamine

IPC分类号： H03H9/64 ,  H03H9/72 ,  H03H9/00 ,  H03H9/05

CPC分类号： H03H9/725 ,  H03H9/0028 ,  H03H9/0576 ,  H03H9/6433 ,  H03H9/6493

摘要： An elastic-wave filter device includes a reception filter section including a longitudinally coupled resonator-type elastic-wave filter section that has a balanced-to-unbalanced conversion function and has improved common-mode isolation characteristics. Among IDT electrodes of a filter section, each of the other comb-shaped electrode of a first IDT electrode including a pair of comb-shaped electrodes, one of which is connected to a first balanced-signal terminal, and the other comb-shaped electrode of a second IDT electrode including a pair of comb-shaped electrodes, one of which is connected to a second balanced-signal terminal, is connected to one of ground electrodes that are provided on a piezoelectric substrate. Inductors are provided on the piezoelectric substrate, and each inductor is connected between the other comb-shaped electrode of one of the first and second IDT electrodes and one of the ground electrodes.

摘要翻译： 弹性波滤波器装置包括接收滤波器部分，其包括纵向耦合的谐振器型弹性波滤波器部分，其具有平衡不平衡转换功能并具有改进的共模隔离特性。 在滤波器部分的IDT电极中，第一IDT电极的另一个梳状电极中的每一个包括一对梳状电极，其中一个梳状电极连接到第一平衡信号端子，另一个梳状电极 包括一对梳状电极的第二IDT电极，其中一个连接到第二平衡信号端子的梳状电极连接到设置在压电基板上的一个接地电极。 电感器设置在压电基板上，每个电感器连接在第一和第二IDT电极之一的另一个梳状电极和一个接地电极之间。

公开(公告)号：US20120326808A1

公开(公告)日：2012-12-27

申请号：US13576653

申请日：2011-02-14

申请人： Guillermo Moreno Granado ,  Jürgen Kiwitt ,  Maximilian Pitschi ,  Tilo Gärtner

发明人： Guillermo Moreno Granado ,  Jürgen Kiwitt ,  Maximilian Pitschi ,  Tilo Gärtner

IPC分类号： H03H9/25

CPC分类号： H03H9/02874 ,  H03H9/02913 ,  H03H9/02952 ,  H03H9/02992 ,  H03H9/6493

摘要： The invention relates to a micro-acoustic filter having a first and a second converter, in which the electromagnetic and capacitive cross-talk between the first and second converters is compensated for by providing additional coupling capacitors and additional current loops. Additional coupling capacitors and current loops are arranged in such a manner that they can counteract the sign of the natural coupling specified by the design and thus completely compensate for said coupling.

摘要翻译： 本发明涉及一种具有第一和第二转换器的微声滤波器，其中第一和第二转换器之间的电磁和电容串扰通过提供额外的耦合电容器和附加的电流回路被补偿。 额外的耦合电容器和电流回路以这样的方式布置，使得它们可以抵消由设计指定的自然耦合的符号，从而完全补偿所述耦合。

公开(公告)号：US20090002099A1

公开(公告)日：2009-01-01

申请号：US12145833

申请日：2008-06-25

申请人： Ryuji Kajihara

发明人： Ryuji Kajihara

IPC分类号： H03H9/64

CPC分类号： H03H9/14505 ,  H03H9/02921 ,  H03H9/02992 ,  H03H9/6493

摘要： In an elastic wave device including an input side electrode and an output side electrode being a resonant single-phase unidirectional transducers (RSPUDT) provided with respective pairs of bus bars opposing to each other on a piezoelectric substrate and a number of excitation electrode fingers extending in a comb-teeth shape so as to respectively cross each other from the respective bus bars, the elastic waves are repeatedly reflected and amplified between the central part of the input side electrode and the central part of the output side electrode along the direction of extension of the respective bus bars by the excitation electrode fingers of the input side electrode and the output side excitation electrode, the elastic wave device includes a damper at least on either one of the input side bus bar or the output side bus bar in an area between the central part of the input side electrode in the direction of movement of the elastic waves and the central part of the output side electrode in the direction of movement of the elastic waves so that the energy leaked out into the bus bar is absorbed.

摘要翻译： 在包括输入侧电极和输出侧电极的弹性波装置中，所述弹性波装置是在压电基板上设置有彼此相对的各对汇流条的谐振单相单向换能器（RSPUDT），以及多个激励电极指 梳齿形状分别从各母线彼此交叉，弹性波在输入侧电极的中心部分和输出侧电极的中心部分之间沿着延伸方向重复反射和放大 通过输入侧电极和输出侧激励电极的激励电极指的各母线，弹性波装置在至少在输入侧母线或输出侧汇流条中的任一个上包括阻尼器 输入侧电极的中心部分在弹性波的移动方向和输出侧的中心部分 在弹性波的移动方向上，使得泄漏到母线中的能量被吸收。

公开(公告)号：US07414497B2

公开(公告)日：2008-08-19

申请号：US11933720

申请日：2007-11-01

申请人： Keiichi Umeda ,  Hideki Kawamura

发明人： Keiichi Umeda ,  Hideki Kawamura

IPC分类号： H03H9/54 ,  H03H3/02

CPC分类号： H03H9/0095 ,  H03H9/009 ,  H03H9/6493

摘要： Providing is a piezoelectric thin-film filter including resonators connected in a lattice pattern, which can achieve large attenuation at frequencies away from a passband and improve steepness near two ends of the passband without involving an additional special step. Second resonators C—2 or first and third resonators C—1 and Cx—1 connected in parallel form series-arm resonators or parallel-arm resonators C—1 connected in a lattice pattern. The capacitance of each second resonator C—2 is larger than the capacitance of each first resonator C—1. The capacitance of each third resonator Cx—1 is substantially equal to the difference between the capacitance of the second resonator C—2 and the capacitance of the first resonator C—1. The resonant frequency of the first resonator C—1 higher than the resonant frequency of the second resonator C—2. The anti-resonant frequency of the third resonator Cx—1 is higher than the resonant frequency of the second resonator C—2 and lower than the resonant frequency of the first resonator C—1.

摘要翻译： 提供一种包括以格子图案连接的谐振器的压电薄膜滤波器，其可以在远离通带的频率处获得大的衰减，并且改善通带两端附近的陡度，而不需要额外的特殊步骤。 并联连接的第二谐振器C 2 - 2或第一和第三谐振器C 1 - 1和C x - 1串联臂谐振器或并联臂 以晶格图案连接的谐振器C 1 - 1。 每个第二谐振器C 2 - 2的电容大于每个第一谐振器C 1 - 2的电容。 每个第三谐振器C x 1 - 1的电容基本上等于第二谐振器C 2 - 2的电容和第一谐振器C 1 - - 1。 第一谐振器C 1 - 1的谐振频率高于第二谐振器C 2的共振频率。 第三谐振器Cx1-1的反谐振频率高于第二谐振器C 2 - 2的谐振频率并且低于第一谐振器C的谐振频率 1。

公开(公告)号：US20080042781A1

公开(公告)日：2008-02-21

申请号：US11924873

申请日：2007-10-26

申请人： Hajime Kando

发明人： Hajime Kando

IPC分类号： H03H9/64

CPC分类号： H03H9/0071 ,  H03H9/0222 ,  H03H9/02559 ,  H03H9/6493

摘要： An elastic boundary wave apparatus that is capable of suppressing an undesired response due to a comb-shaped capacitor electrode includes a first medium; a second medium stacked on the first medium; and a plurality of electrodes arranged in the boundary between the first and second media, wherein a filter and/or a resonator, and an electrostatic capacitor that is electrically connected to the filter and/or the resonator are defined by the plurality of electrodes, the filter and/or the resonator each include an IDT electrode, and the electrostatic capacitor is defined by a comb-shaped capacitor electrode. When the period of the electrode fingers of the IDT is denoted as λm, the sound velocity of an elastic boundary wave in the IDT is denoted as Vm, the period of the electrode fingers of the comb-shaped capacitor electrode is denoted as λc, and the sound velocity of a transverse wave having a lower sound velocity among the sound velocities of the slower transverse waves through the first and second media in the normal direction of the electrode fingers of the comb-shaped capacitor electrode is denoted as Vc, the relationship Vm/λm

摘要翻译： 能够抑制由梳状电容器电极引起的不希望的响应的弹性边界波装置包括：第一介质; 堆叠在第一介质上的第二介质; 以及布置在第一和第二介质之间的边界中的多个电极，其中滤波器和/或谐振器以及电连接到滤波器和/或谐振器的静电电容器由多个电极限定， 滤波器和/或谐振器均包括IDT电极，并且静电电容器由梳状电容器电极限定。 当IDT的电极指的周期表示为lambdam时，IDT中的弹性边界波的声速表示为Vm，梳形电容器电极的电极指的周期表示为lambdac， 梳形电容器电极的电极指的方向上通过第一和第二介质的较慢的横波的声速之间具有较低声速的横波的声速表示为Vc， ？in-line-formula description =“In-line Formulas”end =“lead”？> Vm / lambdam

公开(公告)号：US06903631B2

公开(公告)日：2005-06-07

申请号：US10634524

申请日：2003-08-05

申请人： Hiroshi Kushitani ,  Shunichi Seki

发明人： Hiroshi Kushitani ,  Shunichi Seki

IPC分类号： H03H9/64 ,  H03H9/05 ,  H03H9/25 ,  H03H9/72

CPC分类号： H03H9/0542 ,  H03H9/14597 ,  H03H9/6479 ,  H03H9/6483 ,  H03H9/6493

摘要： A surface acoustic wave (SAW) filter includes an input terminal, an output terminal, a series resonator provided between the input terminal and the output terminal, first and second parallel resonators having respective one ports connected to respective ports of the series resonator, respectively, first and second nodes connected to respective other ports of the first and second parallel resonators, respectively, first and second inductance elements having respective one ends connected to the first and second nodes, respectively, a third node connected to respective other ends of the first and second inductance elements, a third inductance element having one end connected to the third node, a grounding terminal connected to other end of the third inductance element, and a capacitance element connected between the first and second nodes. The SAW filter has a large attenuation amount at a lower side of a pass band of the filter, thus having sufficient properties.

摘要翻译： 表面声波（SAW）滤波器包括输入端子，输出端子，设置在输入端子和输出端子之间的串联谐振器，第一和第二并联谐振器分别具有连接到串联谐振器的各个端口的相应的一个端口， 第一和第二节点分别连接到第一和第二并联谐振器的相应的其它端口，第一和第二电感元件分别具有分别连接到第一和第二节点的一端，连接到第一和第二并联谐振器的相应另一端的第三节点， 第二电感元件，具有连接到第三节点的一端的第三电感元件，连接到第三电感元件的另一端的接地端子以及连接在第一和第二节点之间的电容元件。 SAW滤波器在滤波器的通带的下侧具有较大的衰减量，因此具有足够的性能。

公开(公告)号：US4458221A

公开(公告)日：1984-07-03

申请号：US409040

申请日：1982-08-18

申请人： Hitoshi Suzuki

发明人： Hitoshi Suzuki

IPC分类号： H03H3/08 ,  H03H9/145 ,  H03H9/64

CPC分类号： H03H9/6493 ,  H03H9/1452 ,  Y10T29/42

摘要： A high-performance surface acoustic wave filter is provided having a relative band width greater than 0.2, a shape factor less than 1.5, and a flat group delay time characteristic. The filter has input and output transducers, each with overlapped interdigital electrode fingers, spaced on the surface of a piezoelectric substrate, including an apodized transducer and a second transducer. The envelope of the overlapped portions of the electrode fingers in the apodized transducer includes a main lobe and a plurality of side lobes. The height of side lobes of the apodized transducer which are located farther from the second transducer is greater than the height of side lobes nearer the second transducer. The heights of corresponding side lobes on opposite sides of the main lobe are mathematically related.

摘要翻译： 提供具有大于0.2的相对带宽，小于1.5的形状因子和平坦组延迟时间特性的高性能表面声波滤波器。 滤波器具有输入和输出换能器，每个具有重叠的叉指电极指，间隔在压电基片的表面上，包括变迹的换能器和第二换能器。 变迹传感器中的电极指的重叠部分的包络线包括主瓣和多个旁瓣。 距离第二换能器更远的变迹传感器的旁瓣的高度大于靠近第二换能器的旁瓣的高度。 在主瓣相对侧的相应的旁瓣的高度在数学上是相关的。

公开(公告)号：US20240204752A1

公开(公告)日：2024-06-20

申请号：US18397273

申请日：2023-12-27

申请人： RF360 Singapore Pte. Ltd.

发明人： Ansgar SCHAEUFELE ,  Thomas BAUER ,  Gholamreza DADGAR JAVID

IPC分类号： H03H9/64 ,  H03H9/25

CPC分类号： H03H9/6483 ,  H03H9/25 ,  H03H9/6493

摘要： An improved electro acoustic RF filter (FC) is provided . The RF filter comprises an electro acoustic resonator (EAR) connected between an input port and an output port, an impedance element and a damping and/or dissipation element (DE) in mechanical contact to the impedance element. The damping and/or dissipation element is provided and configured to remove acoustic energy from the impedance element which has a similar construction as the resonator on the same substrate. With such a construction an acoustically inactive impedance element (AIIE) is obtained.