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    • 72. 发明申请
    • ACOUSTIC WAVE RESONATOR
    • 声音波共振器
    • US20080309192A1
    • 2008-12-18
    • US12203393
    • 2008-09-03
    • Takeshi NakaoYasuharu NakaiMichio Kadota
    • Takeshi NakaoYasuharu NakaiMichio Kadota
    • H03H9/25H03H9/15
    • H03H9/02818H03H9/02992H03H9/1452
    • In an acoustic wave resonator, an IDT electrode is provided on a piezoelectric substrate. The IDT electrode is apodization-weighted such that a plurality of maximum values of cross widths are provided in acoustic wave propagation directions. Alternatively, in apodization weighting, weighting is applied such that at least one of a pair of envelopes located at outer side portions of the IDT electrode in directions substantially perpendicular to acoustic wave propagation directions includes a plurality of angled envelope portions angled from a central portion of the IDT electrode toward an outer side portion of the IDT electrode in a direction substantially perpendicular to the acoustic wave propagation directions.
    • 在声波谐振器中,在压电基板上设置有IDT电极。 IDT电极被变迹加权,使得在声波传播方向上提供多个最大交叉宽度值。 或者,在变迹加权中,施加加权,使得位于IDT电极的外侧部分的大致垂直于声波传播方向的方向上的一对包络中的至少一个包括多个成角度的包络部分,该包络部分从 IDT电极朝向与声波传播方向大致正交的方向朝向IDT电极的外侧部分。
    • 79. 发明授权
    • Noise suppression method for wave filter
    • 滤波器噪声抑制方法
    • US07057476B2
    • 2006-06-06
    • US10853873
    • 2004-05-25
    • Keh-Long Hwu
    • Keh-Long Hwu
    • H03H9/15H03H9/54
    • H03H9/02118H03H9/0211
    • A noise suppression method of a wave filter used to eliminate standing wave signal interferences in the acoustic wave filter consisted by a plurality of film bulk acoustic resonators (FBARs). The method is to provide a plurality of scatterers in the structured consisted by the FBARs, thereby creating an band-gap structure due to the material characteristics difference, which consequently generates a destructive interfering effect to the transverse higher harmonics vibration within a specific operating frequency range, and ultimately decreases or even eliminates any parasitic effects. Therefore, within the operation frequency range of this band-gap structure, abnormal signals created by any transverse wave modes cannot exist. In addition, an acoustic shield can be provided by phononic crystal structures between different FBARs, thus acoustic shielding any mutual interference within the operation frequency range.
    • 用于消除由多个膜体声波谐振器(FBAR)组成的声波滤波器中的驻波信号干扰的滤波器的噪声抑制方法。 该方法是在由FBAR构成的结构中提供多个散射体,从而由于材料特性差异而产生带隙结构,因此,这在特定工作频率范围内对横向高次谐波振动产生破坏性的干扰效应 ,并最终减少甚至消除任何寄生效应。 因此,在该带隙结构的工作频率范围内,不能存在由任何横波模式产生的异常信号。 另外,可以通过不同FBAR之间的声子晶体结构提供声屏蔽,从而声音屏蔽操作频率范围内的任何相互干扰。