公开(公告)号：US20190190493A1

公开(公告)日：2019-06-20

申请号：US16283867

申请日：2019-02-25

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Koji NOSAKA

IPC: H03H9/64 ,  H03H9/205 ,  H03H9/72 ,  H03H7/01 ,  H03H9/25

Abstract: A filter includes a series-arm resonator connected on a path connecting input/output terminals, and first and second parallel-arm resonators that are 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 is defined by an acoustic wave resonator including an IDT electrode. The IDT electrode in the second parallel-arm resonator has a lower aspect ratio than the IDT electrode in the first parallel-arm resonator, where the aspect ratio is a ratio of an overlap width of electrode fingers to the number of pairs of electrode fingers.

公开(公告)号：US20180234078A1

公开(公告)日：2018-08-16

申请号：US15956032

申请日：2018-04-18

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takaya WADA ,  Koji NOSAKA

IPC: H03H9/58 ,  H03H9/64

CPC classification number: H03H9/58 ,  H03H9/6403 ,  H03H9/6406 ,  H03H9/6483 ,  H03H2009/02165 ,  H03H2210/025 ,  H03H2210/033 ,  H03H2210/036

Abstract: A tunable filter includes a series-arm resonant circuit, and a parallel-arm resonant circuit. The series-arm resonant circuit includes a group of acoustic wave resonant circuits that have different resonant frequencies, a variable capacitor, and switching circuits. The parallel-arm resonant circuit includes another group of acoustic wave resonant circuits that have different resonant frequencies, a variable capacitor, and switching circuits. For example, the difference in pass-band frequency caused by the difference in resonant frequency between the acoustic wave resonant circuit in the group and the acoustic wave resonant circuit in the other group is greater than the maximum difference in pass-band frequency resulting from the variable range of capacitance of the variable capacitor.

公开(公告)号：US20160218696A1

公开(公告)日：2016-07-28

申请号：US14969133

申请日：2015-12-15

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Koji NOSAKA

IPC: H03H9/64 ,  H03H9/25

CPC classification number: H03H9/6423 ,  H03H9/542 ,  H03H9/6483

Abstract: A filter apparatus includes a low pass filter and a high pass filter connected in series to each other. The low pass filter includes first acoustic resonators including a resonant frequency and an anti-resonant frequency, first inductors, and first capacitive elements. The high pass filter includes second inductors, second capacitive elements, and second acoustic resonators. A first attenuation band caused by the anti-resonant frequency of the first acoustic resonators is provided at a low frequency side of a pass band and a second attenuation band caused by the resonant frequency of the second acoustic resonators is provided at a high frequency side of the pass band. A third attenuation band caused by a first LC resonant circuit is provided at a low frequency side of the first attenuation band and a fourth attenuation band caused by a second LC resonant circuit is provided at a high frequency side of the second attenuation band.

Abstract translation: 滤波器装置包括彼此串联连接的低通滤波器和高通滤波器。 低通滤波器包括包括谐振频率和反谐振频率的第一声谐振器，第一电感器和第一电容元件。 高通滤波器包括第二电感器，第二电容元件和第二声谐振器。 在通带的低频侧设置由第一声谐振器的反谐振频率引起的第一衰减频带，并且在第二声谐振器的高频侧设置由第二声谐振器的谐振频率引起的第二衰减频带 通带。 在第一衰减频带的低频侧设置由第一LC谐振电路引起的第三衰减频带，并且在第二衰减频带的高频侧设置由第二LC谐振电路引起的第四衰减频带。

公开(公告)号：US20150222246A1

公开(公告)日：2015-08-06

申请号：US14682184

申请日：2015-04-09

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Koji NOSAKA

IPC: H03H9/54 ,  H03H7/01

CPC classification number: H03H9/542 ,  H03H7/09 ,  H03H7/1775 ,  H03H9/6423 ,  H03H9/6483

Abstract: A filter device includes a first LC parallel resonance circuit having a first inductance and connected between a line connecting an input terminal and an output terminal and a ground potential, a second LC parallel resonance circuit having a second inductance and connected between the line and the ground potential, and at least one elastic wave resonator that is connected between an end portion of the first LC parallel resonance circuit and an end portion of the second LC parallel resonance circuit. Attenuation-frequency characteristics of an LC filter including the first LC parallel resonance circuit, the second LC parallel resonance circuit, and a capacitive property and attenuation-frequency characteristics of the at least one elastic wave resonator are used.

Abstract translation: 滤波器装置包括具有第一电感并连接在连接输入端和输出端的线与地电位之间的第一LC并联谐振电路，具有第二电感并连接在线与地之间的第二LC并联谐振电路 电位和连接在第一LC并联谐振电路的端部与第二LC并联谐振电路的端部之间的至少一个弹性波谐振器。 使用包括第一LC并联谐振电路，第二LC并联谐振电路以及至少一个弹性波谐振器的电容特性和衰减频率特性的LC滤波器的衰减频率特性。

公开(公告)号：US20210006232A1

公开(公告)日：2021-01-07

申请号：US17027725

申请日：2020-09-22

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Koji NOSAKA

IPC: H03H9/64 ,  H03H9/25 ,  H03H9/145 ,  H03H9/72 ,  H03F3/19 ,  H04B1/40

Abstract: A filter includes: a series-arm resonator; and a parallel-arm resonator. The series-arm resonator and the parallel-arm resonator each include: an interdigital transducer (IDT) electrode formed on a substrate and including a plurality of electrode fingers; and a protective film. The protective film included in the parallel-arm resonator is thinner than the protective film included in the series-arm resonator. The parallel-arm resonator has a first fractional bandwidth ((the higher-order resonance frequency−the resonant frequency)/the resonant frequency) greater than the first fractional bandwidth of the series-arm resonator. The parallel-arm resonator has a second fractional bandwidth ((the higher-order antiresonant frequency−the antiresonant frequency)/the antiresonant frequency) greater than the second fractional bandwidth of the series-arm resonator.

公开(公告)号：US20190326884A1

公开(公告)日：2019-10-24

申请号：US16358811

申请日：2019-03-20

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Koji NOSAKA

IPC: H03H9/54 ,  H03H9/13 ,  H03H9/205

Abstract: A variable filter (10) includes a parallel arm resonance circuit and a serial arm resonance circuit, the parallel arm resonance circuit includes a parallel arm resonator (p1) having an IDT electrode (121) and a frequency variable circuit (11) connected to the parallel arm resonator (p1), the frequency variable circuit (11) includes a capacitance element (C1) and a switch (SW), the variable filter (10) further includes a capacitance element (C2) connected between a serial arm and ground, the IDT electrode (121), an IDT wiring connected to the IDT electrode (121), and a capacitance wiring connected to the capacitance element (C1) are formed on the same substrate, a wiring (141 or 144) of the capacitance wirings and a wiring (143) of the IDT wirings intersect with each other, and the capacitance element (C2) is configured of the capacitance wiring and the IDT wiring in the intersection region.

公开(公告)号：US20190267969A1

公开(公告)日：2019-08-29

申请号：US16353088

申请日：2019-03-14

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Hideki TSUKAMOTO ,  Koji NOSAKA

IPC: H03H9/54 ,  H03H9/02 ,  H03H9/64 ,  H03H9/205 ,  H03H9/70 ,  H03H9/72

Abstract: A filter includes a series arm resonator, a first parallel arm resonance circuit and a second parallel arm resonance circuit. The each of the first parallel arm resonance circuit and the second parallel arm resonance circuit includes: a parallel arm resonator that is connected to a node; a pair of elements consisting of a capacitor and a switch, which are connected in parallel with each other, that is connected in series with the parallel arm resonator; and an inductor that is provided on a path that connects the node and ground to each other via the switch. The inductance value of the inductor of the first parallel arm resonance circuit and the inductance value of the inductor of the second parallel arm resonance circuit are substantially equal to each other.

公开(公告)号：US20190245517A1

公开(公告)日：2019-08-08

申请号：US16364417

申请日：2019-03-26

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Koji NOSAKA

IPC: H03H9/64 ,  H03H9/145 ,  H03H9/25 ,  H03F3/19

CPC classification number: H03H9/6479 ,  H03F3/19 ,  H03F2200/165 ,  H03F2200/231 ,  H03F2200/294 ,  H03F2200/451 ,  H03H9/145 ,  H03H9/14541 ,  H03H9/25 ,  H03H9/6483 ,  H03H9/72 ,  H03H2210/012 ,  H04B1/00 ,  H04B1/18 ,  H04B1/40

Abstract: A variable filter includes a serial arm resonator and a parallel arm resonance circuit, the parallel arm resonance circuit includes a parallel arm resonator and a capacitance element connected to the parallel arm resonator, the serial arm resonator and the parallel arm resonator respectively include IDT electrodes each formed of a plurality of electrode fingers formed on a substrate, and a film thickness of the plurality of electrode fingers of the parallel arm resonator is larger than a film thickness of the plurality of electrode fingers of the serial arm resonator.

公开(公告)号：US20190222198A1

公开(公告)日：2019-07-18

申请号：US16365839

申请日：2019-03-27

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Hideki TSUKAMOTO ,  Koji NOSAKA

IPC: H03H9/64 ,  H03H9/72 ,  H03H9/02 ,  H03H9/17 ,  H03H9/205 ,  H03H9/54 ,  H04B1/525

CPC classification number: H03H9/64 ,  H03H9/02007 ,  H03H9/171 ,  H03H9/205 ,  H03H9/542 ,  H03H9/72 ,  H04B1/00 ,  H04B1/403 ,  H04B1/525

Abstract: A filter includes a series arm resonator, a first parallel arm resonance circuit, and a second parallel arm resonance circuit. The first parallel arm resonance circuit includes: a first parallel arm resonator connected to a first node; a first capacitor and a first switch connected together in parallel and connected in series with the first parallel arm resonator; and a first inductor provided on a path connecting the node and ground to each other via the first switch. The second parallel arm resonance circuit includes: a second parallel arm resonator connected to a second node; a second capacitor and a second switch connected together in parallel and connected in series with the second parallel arm resonator; and a second inductor provided on a path connecting the second node and ground to each other via the second switch. The first and second inductor have different inductance values.

公开(公告)号：US20190214970A1

公开(公告)日：2019-07-11

申请号：US16354276

申请日：2019-03-15

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Atsushi HORITA ,  Koji NOSAKA

IPC: H03H9/64 ,  H03H9/145 ,  H03H9/25 ,  H03H9/72 ,  H04B1/00 ,  H04B1/18

Abstract: An acoustic wave filter device includes a first resonant circuit, a second resonant circuit, a first interconnect line, and a second interconnect line. The second resonant circuit includes a second parallel-arm resonator, and a frequency-tuning circuit that allows tuning of the resonant frequency of the second parallel-arm resonator. The frequency-tuning circuit includes a capacitor, and a switching element connected in parallel with the capacitor. The first interconnect line is an interconnect line connected to the portion of the series-arm resonator located adjacent to the first input/output terminal. The second interconnect line is an interconnect line connecting the parallel-arm resonator with the switching element, or an interconnect line connecting the parallel-arm resonator with the capacitor. A first transmission line formed by the first interconnect line, and a second transmission line formed by the second interconnect line are magnetically coupled with each other.