-
1.发明授权公开(公告)号：US10886892B2
公开(公告)日：2021-01-05
申请号：US16532525
申请日：2019-08-06
发明人： Koji Nosaka
摘要： A filter includes a series arm resonant circuit connected between input/output terminals, and a parallel arm resonant circuit connected between a node on a path connecting the input/output terminals and ground. The series arm resonant circuit includes a series arm resonator having a band width ratio wider than the band width ratio of the parallel arm resonant circuit and a capacitor connected to the series arm resonator.
-
2.发明授权公开(公告)号：US10715110B2
公开(公告)日：2020-07-14
申请号：US16354276
申请日：2019-03-15
发明人： Atsushi Horita , Koji Nosaka
IPC分类号： H03H9/145 , H03H9/64 , H04B1/18 , H03H9/72 , H04B1/00 , H03H9/25 , H04B1/04 , H03H9/54 , H03H9/60 , H03H7/01 , H03H7/09
摘要： 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.
-
公开(公告)号：US10382009B2
公开(公告)日：2019-08-13
申请号：US16056935
申请日：2018-08-07
发明人： Koji Nosaka
摘要： An RF front-end circuit (2) includes an antenna common terminal (20) connected to an antenna element (1), an SPDT switch circuit (21) having a common terminal (21c) and select terminals (21s1 and 21s2), and four filter elements (22A to 22D). The common terminal (21c) and the filter elements (22C and 22D) are connected to the antenna common terminal (20). The filter elements (22A and 22B) are connected to the select terminals (21s1 and 21s2), respectively. Pass bands of the filter elements (22A, 22C and 22D) do not overlap with one another, and pass bands of the filter elements (22B, 22C and 22D) do not overlap with one another. The pass bands of the filter elements (22A and 22B) partly overlap with each other.
-
公开(公告)号：US09673771B2
公开(公告)日：2017-06-06
申请号：US14302548
申请日：2014-06-12
发明人： Koji Nosaka
CPC分类号： H03H7/0115 , H03H5/02 , H03H7/09 , H03H7/1783 , H03H2001/0085
摘要： A multilayer filter includes a plurality of mutually coupled resonant circuits provided within a multilayer body. Capacitor internal electrodes, inductor internal electrodes, and inductor via electrodes, ground via electrodes, and input-output via electrodes are arranged within the multilayer body. The ground via electrodes and the input-output via electrodes are provided on a dielectric layer on a mounting surface, or a second dielectric layer on a first dielectric layer provided on the mounting surface. The capacitor internal electrodes arranged towards the side of the mounting surface do not overlap the input-output electrodes when viewed in plan view. With this configuration, degradation in frequency characteristics of a resonant circuit is effectively prevented by controlling one of an inductive component and a capacitive component of the resonant circuit.
-
公开(公告)号：US11843367B2
公开(公告)日：2023-12-12
申请号：US16984158
申请日：2020-08-04
发明人： Koji Nosaka
CPC分类号： H03H9/6406 , H03H9/58 , H03H9/6433 , H03H9/6489 , H03H9/68 , H03H9/703 , H03H9/725 , H04B1/04 , H04B1/16
摘要： A filter device according to an embodiment of the present disclosure includes a first filter and a second filter that are connected in parallel between a first terminal and a second terminal. The first filter includes multiple series arm resonators. The series arm resonators are disposed in series in a path from the first terminal via the first filter to the second terminal. The series arm resonators include a first series arm resonator and a second series arm resonator. Under a condition that a value obtained by dividing a difference between an antiresonance frequency and a resonance frequency of each series arm resonator by the resonance frequency is defined as a fractional bandwidth, a first fractional bandwidth of the first series arm resonator is different from a second fractional bandwidth of the second series arm resonator.
-
6.发明授权公开(公告)号：US11476835B2
公开(公告)日：2022-10-18
申请号：US16199362
申请日：2018-11-26
发明人： Koji Nosaka
摘要： 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.
-
公开(公告)号：US11031920B2
公开(公告)日：2021-06-08
申请号：US16519596
申请日：2019-07-23
发明人： Koji Nosaka
摘要： A radio-frequency filter (10) includes a series arm circuit (11) and a parallel arm circuit (12). The series arm circuit (11) is disposed on a path connecting an input/output terminal (11m) and an input/output terminal (11n). The parallel arm circuit (12) is connected to a ground and to a node (x1) on the path. The series arm circuit (11) includes a series connecting circuit (11e) and a first variable frequency circuit (11a). The series connecting circuit (11e) includes a series arm resonator (s1) and a capacitor (C1). The first variable frequency circuit (11a) is connected in parallel with the series connecting circuit (11e) and varies the anti-resonant frequency of the series arm circuit (11). The first variable frequency circuit (11a) includes a capacitor (C2) and a switch (SW1) connected in series with each other. The series arm resonator (s1) and the capacitor (C1) are connected in series with each other.
-
公开(公告)号：US10979027B2
公开(公告)日：2021-04-13
申请号：US16364417
申请日：2019-03-26
发明人： Koji Nosaka
摘要： 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.
-
9.发明授权公开(公告)号：US10720903B2
公开(公告)日：2020-07-21
申请号：US16283868
申请日：2019-02-25
发明人： Koji Nosaka
摘要： 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.
-
公开(公告)号：US10659007B2
公开(公告)日：2020-05-19
申请号：US15956032
申请日：2018-04-18
发明人： Takaya Wada , Koji Nosaka
摘要： 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.
-
-
-
-
-
-
-
-
-
搜索结果
53 条记录 (耗时 0.022 秒)
