中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

30 records (took 0.018 seconds)

    Acoustic wave device, filter, and composite filter device
    6.
    发明授权
    Acoustic wave device, filter, and composite filter device 有权

    公开(公告)号：US11165409B2

    公开(公告)日：2021-11-02

    申请号：US16658211

    申请日：2019-10-21

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Tomio Kanazawa ,  Hiroshi Shimizu ,  Syunsuke Kido ,  Ryo Nakagawa

    IPC: H03H9/145 ,  H03H9/64 ,  H03H9/25 ,  H03H9/72

    Abstract: An acoustic wave device includes an interdigital transducer electrode provided on a piezoelectric substrate, the interdigital transducer electrode includes first and second electrode fingers. The second electrode fingers are connected to an electric potential different from that of the first electrode fingers. A direction orthogonal or substantially orthogonal to a direction in which the first electrode fingers and the second electrode fingers extend is an acoustic wave propagation direction, the interdigital transducer electrode includes a first area centrally provided in the acoustic wave propagation direction, second areas provided on one side and another side of the first area in the acoustic wave propagation direction, and third areas each provided on a side of each of the second areas opposite to the first area in the acoustic wave propagation direction.

    Multiplexer including filters with resonators and parallel inductor
    7.
    发明授权
    Multiplexer including filters with resonators and parallel inductor 有权

    公开(公告)号：US10727805B2

    公开(公告)日：2020-07-28

    申请号：US16273192

    申请日：2019-02-12

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Masanori Kato ,  Syunsuke Kido

    IPC: H03H7/01 ,  H03H9/54 ,  H03H9/60 ,  H03H9/64 ,  H03H7/38 ,  H03H9/46 ,  H04J1/04 ,  H03H9/02

    Abstract: A filter includes two series arm resonators electrically connected in series between two input/output terminals, a parallel arm resonator electrically connected between a ground and a series arm between the two series arm resonators, an inductor electrically connected in parallel to the two series arm resonators, and a matching circuit electrically connected between one of the two series arm resonators and one of the input/output terminals, wherein the two series arm resonators and the parallel arm resonator define a pass band of a bandpass filter, the two series arm resonators and the inductor define an LC resonant circuit, respective anti-resonant frequencies of each of the two series arm resonators and a resonant frequency of the parallel arm resonator are located in a pass band of the LC resonant circuit, and a resonant frequency of the LC resonant circuit is lower than the resonant frequency of the parallel arm resonator.

    Acoustic wave device, and ladder filter including the same
    9.
    发明授权
    Acoustic wave device, and ladder filter including the same 有权

    公开(公告)号：US12255635B2

    公开(公告)日：2025-03-18

    申请号：US17869808

    申请日：2022-07-21

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kentaro Nakamura ,  Shinichi Okada ,  Syunsuke Kido

    IPC: H03H9/64 ,  H03H9/02 ,  H03H9/145 ,  H03H9/25

    Abstract: An acoustic wave device includes a substrate, a first resonator, a second resonator, and a shared reflector. The second resonator is adjacent to the first resonator and has different frequency characteristics different than the first resonator. The first resonator includes a first interdigital transducer electrode. The second resonator includes a second interdigital transducer electrode. The shared reflector has frequency characteristics that are the same as both frequency characteristics of the first resonator and frequency characteristics of the second resonator or between the frequency characteristics of the first resonator and the frequency characteristics of the second resonator. a higher-order mode frequency of the first resonator and a higher-order mode frequency of the second resonator coincides. When the number of electrode fingers of the shared reflector is even, an electrode finger facing the shared reflector in the first interdigital transducer electrode and an electrode finger facing the shared reflector in the second interdigital transducer electrode have the same polarity. When the number of electrode fingers of the shared reflector is odd, an electrode finger facing the shared reflector in the first interdigital transducer electrode and an electrode finger facing the shared reflector in the second interdigital transducer electrode have opposite polarities.

    Filter device and multiplexer
    10.
    发明授权
    Filter device and multiplexer 有权

    公开(公告)号：US12199589B2

    公开(公告)日：2025-01-14

    申请号：US17452474

    申请日：2021-10-27

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Keisuke Nishio ,  Syunsuke Kido ,  Masanori Kato ,  Hiroshi Matsubara

    IPC: H03H9/02 ,  H03H7/01 ,  H03H7/075 ,  H03H7/46 ,  H03H9/54 ,  H03H9/60 ,  H03H9/64 ,  H03H9/70 ,  H03H9/72

    Abstract: A filter device having a pass band and a stop band on a lower frequency side than the pass band includes a filter having a pass band including the pass band, a series arm resonator connected in series to the filter, a first inductor directly connected in series to the series arm resonator, and a parallel arm resonator connected between a node on a path connecting the filter and the series arm resonator and the ground. The parallel arm resonator constitutes a resonance circuit having a resonant frequency at which an attenuation pole corresponding to a high frequency end of the first stop band, and the series arm resonator and the inductor constitute a resonance circuit having an anti-resonant frequency on a lower frequency side than the pass band and having a sub-resonant frequency higher than a resonant frequency of the resonance circuit.

Patent Agency Ranking