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21.发明申请公开(公告)号：US20190190491A1
公开(公告)日：2019-06-20
申请号：US16283882
申请日：2019-02-25
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
CPC classification number: H03H9/568 , H03H9/02637 , H03H9/132 , H03H9/14541 , H03H9/205 , H03H9/542 , H03H9/6403 , H03H9/6483 , H04B1/006 , H04B1/18 , H04B1/40
Abstract: A filter includes a series-arm resonator connected to a path connecting input/output terminals, and first and second parallel-arm resonators connected between the same node on the path and ground. A resonant frequency of the second parallel-arm resonator is higher than a resonant frequency of the first parallel-arm resonator, and an anti-resonant frequency of the second parallel-arm resonator is higher than an anti-resonant frequency of the first parallel-arm resonator. The second parallel-arm resonator includes an IDT electrode that excites an acoustic wave, and does not include a reflector.
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22.发明申请公开(公告)号：US20190097605A1
公开(公告)日：2019-03-28
申请号：US16199362
申请日：2018-11-26
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: A filter (22A) includes: a series arm circuit (11) that is connected between an input/output terminal (22m) and an input/output terminal (22n); and a parallel arm circuit (12) that is connected between a node (x1), which is on a path that connects the input/output terminal (22m) and the input/output terminal (22n), and ground. The parallel arm circuit (12) includes a parallel arm resonator (22p) and an impedance circuit (13) that is serially connected to the parallel arm resonator (22p). The impedance circuit (13) includes a first impedance element, which is one of an inductor and a capacitor, a second impedance element, which is the other of an inductor and a capacitor, and a switch (22SW) that is serially connected to the second impedance element. A first series circuit (14) comprising of the second impedance element and the switch (22SW) is connected in parallel with the first impedance element.
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公开(公告)号：US20170134005A1
公开(公告)日：2017-05-11
申请号：US15409696
申请日：2017-01-19
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Morio TAKEUCHI , Koji NOSAKA
CPC classification number: H03H9/542 , H03H7/1758 , H03H7/1766 , H03H9/605 , H03H9/6406 , H03H9/6483 , H04W88/06
Abstract: In a band pass filter, a first elastic wave resonator includes a first base board type and a first electrode configuration significantly improved or optimal for frequency characteristics of the first elastic wave resonator, and a second elastic wave resonator includes a second base board type and a second electrode configuration significantly improved or optimal for frequency characteristics of the second elastic wave resonator. A first attenuation pole provided by the first elastic wave resonator and a second attenuation pole provided by the second elastic wave resonator is steeper than if the first elastic wave resonator and the second elastic wave resonator that have different frequency characteristics include electrodes having the same configuration on the same types of base boards.
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公开(公告)号：US20160218695A1
公开(公告)日：2016-07-28
申请号：US15002527
申请日：2016-01-21
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
IPC: H03H9/64
CPC classification number: H03H9/568 , H03H9/605 , H03H9/6483
Abstract: A ladder filter includes a series arm resonator arranged on a series arm connecting an input terminal and an output terminal to each other, and at least one parallel arm resonator. The series arm resonator and the at least one parallel arm resonator are resonators each including a resonant point and an anti-resonant point. The series arm resonator includes first and second series arm resonators connected in parallel with each other. For a resonant frequency fr1 and an anti-resonant frequency fa1 of the first series arm resonator, and for a resonant frequency fr2 and an anti-resonant frequency fa2 of the second series arm resonator, resonant frequency difference Δfr=|fr1−fr2|>|fa2−fr1|.
Abstract translation: 梯形滤波器包括布置在将输入端子和输出端子彼此连接的串联臂上的串联臂谐振器和至少一个并联臂谐振器。 串联臂谐振器和至少一个并联臂谐振器是谐振器，每个谐振器包括谐振点和反谐振点。 串联臂谐振器包括彼此并联连接的第一和第二串联臂谐振器。 对于第一串联臂谐振器的谐振频率fr1和反谐振频率fa1，以及对于第二串联臂谐振器的谐振频率fr2和反谐振频率fa2，谐振频率差Δfr= | fr1-fr2 |> | fa2-fr1 |。
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公开(公告)号：US20220376675A1
公开(公告)日：2022-11-24
申请号：US17868817
申请日：2022-07-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yasumasa TANIGUCHI , Koji NOSAKA , Ryo NAKAGAWA
Abstract: When a current flowing in a series circuit including an equivalent resistance, an equivalent inductor, and an equivalent capacitance in an electric equivalent circuit of a specific resonator in each filter is defined as an acoustic path current, under conditions that a phase of an acoustic path current of a first transmission filter at a side of a common terminal at a frequency within a first transmission band is represented as θ1Tx, a phase of an acoustic path current of the first transmission filter at the side of the common terminal at a frequency within a second transmission band is represented as θ2Tx, a phase of an acoustic path current of a first reception filter at the side of the common terminal at a frequency within the first transmission band is represented as θ1Rx, and a phase of an acoustic path current of the first reception filter at the side of the common terminal at a frequency within the second transmission band is represented as θ2Rx, a multiplexer satisfies a first condition: |(2·θ1Tx−θ2Tx)−(2·θ1Rx−θ2Rx)|=180°±90°, or a second condition: |(2·θ2Tx−θ1Tx)−(2·θ2Rx−θ1Rx)|=180°±90°.
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Patent Agency Ranking
26.发明申请公开(公告)号：US20200036365A1
公开(公告)日：2020-01-30
申请号：US16590579
申请日：2019-10-02
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: The acoustic wave filter (10A) includes a parallel-arm resonant circuit (12p). The parallel-arm resonant circuit (12p) includes a parallel-arm resonator (p1) and a frequency variable circuit (72p) that are connected in parallel. The frequency variable circuit (72p) includes a parallel-arm resonator (p2) that has a resonant frequency higher than that of the parallel-arm resonator (p1) and a switch (SW1) element. A frequency difference between a resonant frequency on a higher frequency side of the parallel-arm resonant circuit (12p) in a case where the switch (SW1) is OFF and a resonant frequency on a higher frequency side of the parallel-arm resonant circuit (12p) in a case where the switch (SW1) is ON is equal to or more than a frequency difference between a low frequency end frequency of the second attenuation band and a low frequency end frequency of the first attenuation band.
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27.发明申请公开(公告)号：US20190199321A1
公开(公告)日：2019-06-27
申请号：US16293744
申请日：2019-03-06
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
CPC classification number: H03H9/14544 , H03H7/01 , H03H9/02637 , H03H9/02866 , H03H9/145 , H03H9/25 , H03H9/64 , H03H9/6483 , H03H9/6489 , H03H9/72 , H04B1/44
Abstract: A filter includes a parallel arm resonator and an interdigital capacitor. The parallel arm resonator has an IDT electrode defined by first electrode fingers. The interdigital capacitor is defined by second electrode fingers and is connected to the parallel arm resonator. The electrode finger pitch of the second electrode fingers is smaller than the electrode finger pitch of the first electrode fingers. The film thickness of the second electrode fingers is smaller than the film thickness of the first electrode fingers. A self-resonant frequency of the interdigital capacitor is higher than a pass band of the filter.
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28.发明申请公开(公告)号：US20190190494A1
公开(公告)日：2019-06-20
申请号：US16283868
申请日：2019-02-25
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: A filter includes a series-arm resonator connected on a path connecting input/output terminals, and first and second parallel-arm resonators connected between the same node on the path and ground. A resonant frequency of the second parallel-arm resonator is higher than a resonant frequency of the first parallel-arm resonator, and an anti-resonant frequency of the second parallel-arm resonator is higher than an anti-resonant frequency of the first parallel-arm resonator. Each of the first and second parallel-arm resonators includes an acoustic wave resonator including an IDT electrode. The IDT electrode in the second parallel-arm resonator has a higher duty ratio than the IDT electrode in the first parallel-arm resonator, where the duty ratio is the ratio of the width to the pitch of electrode fingers.
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公开(公告)号：US20190181838A1
公开(公告)日：2019-06-13
申请号：US16278944
申请日：2019-02-19
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: A filter device includes a filter (22A) connected to a common terminal (110) and having a first characteristic, a variable filter (22B) connected to the common terminal (110) and capable of changing a characteristic to one of a second characteristic and a third characteristic, and a switch (23). In the second characteristic, a second pass band including an overlapping band in which the second pass band and an attenuation band of the filter (22A) partially overlap in frequency is defined. Insertion loss within the overlapping band for the third characteristic is greater than insertion loss within the overlapping band for the second characteristic. When the filter (22A) is selected by the switch (23), the characteristic of the variable filter (22B) is set to the third characteristic.
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30.发明申请公开(公告)号：US20190181833A1
公开(公告)日：2019-06-13
申请号：US16280482
申请日：2019-02-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: An acoustic wave filter device includes a ground connection terminal connected to an external ground electrode, a serial arm resonator, a first parallel arm circuit connected to a first node of the serial arm resonator, the first node being positioned closer to an input/output terminal, and to the ground connection terminal, and a second parallel arm circuit connected to a second node of the serial arm resonator, the second node being positioned closer to an input/output terminal, and to the ground connection terminal. The first parallel arm circuit includes a parallel arm resonator having a resonant frequency higher than a center frequency of a filter pass band, and a frequency varying circuit connected to the parallel arm resonator and the ground connection terminal. The second parallel arm circuit includes a parallel arm resonator having a resonant frequency higher than the center frequency of the filter pass band.
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