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    • 4. 发明授权
    • Piezoelectric bulk acoustic wave device
    • 压电体波器件
    • US06259187B1
    • 2001-07-10
    • US09472806
    • 1999-12-28
    • Hidenori AbeHisatoshi Saitou
    • Hidenori AbeHisatoshi Saitou
    • H03H925
    • H03H9/174H03H9/177
    • An object of the invention is to provide a piezoelectric bulk acoustic wave device having a high effective electromechanical coupling constant and allowing a fractional bandwidth to be broadened when applied to a filter and a normalized frequency variable width to be broadened when applied to an oscillator. Another object of the invention is to provide a miniature piezoelectric bulk acoustic wave device capable of operating at a high frequency of several hundreds of megahertz while maintaining a high electromechanical coupling constant. The piezoelectric bulk acoustic wave device includes a piezoelectric substrate constructed of a single crystal or oriented crystal body of potassium niobate and having a pair of major surfaces, and at least one pair of opposed electrodes formed on the major surfaces of the piezoelectric substrate, respectively, wherein the device utilizes thickness vibration propagating along the major surfaces.
    • 本发明的目的是提供一种具有高有效机电耦合常数的压电体声波器件,并且当施加到滤波器时允许分数带宽变宽,并且当应用于振荡器时,可以使归一化的频率可变宽度变宽。 本发明的另一个目的是提供一种能够在保持高机电耦合常数的同时以几百兆赫兹的高频率工作的微型压电体声波器件。 压电体振子装置包括由铌酸钾的单晶或取向晶体构成并具有一对主表面的压电基片和分别形成在压电基板的主表面上的至少一对相对电极, 其中该装置利用沿主表面传播的厚度振动。
    • 8. 发明授权
    • Surface acoustic wave filter with optimally sized gaps between
transducers
    • 表面声波滤波器,在传感器之间具有最佳尺寸的间隙
    • US5877661A
    • 1999-03-02
    • US737372
    • 1997-06-17
    • Masashi OhmuraHiroshi HonmoHidenori Abe
    • Masashi OhmuraHiroshi HonmoHidenori Abe
    • H03H9/00H03H9/64
    • H03H9/0028H03H9/6433H03H9/6469
    • A surface acoustic wave filter comprises a first electrode structure array which is formed on the piezoelectric substrate, and includes an input/output IDT, two receipt IDTs formed outside the input/output IDT and two reflectors formed outside the two receipt IDTs, and a second electrode structure array which is formed on the piezoelectric substrate and includes an input/output IDT, two receipt IDTs formed outside the input/output IDT and two reflectors formed outside the two receipt IDTs, which are concatenated with each other. In a case that the surface acoustic wave filter is represented by a symmetrical lattice-type circuit which is expressed by a serial arm impedance and a parallel arm impedance and is electrically equivalent to the same, at least two resonances of the serial arm impedance and at least three resonances of the parallel arm impedance are used to form a passband. The surface acoustic wave filter can have wide bands and low spurious signal.
    • PCT No.PCT / JP96 / 00691 Sec。 371日期:1997年6月17日 102(e)日期1997年6月17日PCT 1996年3月15日PCT公布。 公开号WO96 / 28886 日期1996年9月19日一种表面声波滤波器,包括形成在压电基板上的第一电极结构阵列,并且包括输入/​​输出IDT,形成在输入/输出IDT外部的两个接收IDT,以及形成在两个接收之外的两个反射器 IDT,以及形成在压电基板上并包括输入/​​输出IDT,形成在输入/输出IDT外部的两个接收IDT和形成在两个接收IDT之外的两个反射器的第二电极结构阵列,它们彼此并联。 在表面声波滤波器由以串联臂阻抗和并联臂阻抗表示的并且与之相当的对称晶格型电路表示的情况下,串联臂阻抗和串联臂阻抗的至少两个谐振 使用并联臂阻抗的至少三个谐振来形成通带。 表面声波滤波器可以具有宽带和低杂散信号。