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    • 5. 发明授权
    • Surface acoustic wave device
    • 表面声波装置
    • US5585684A
    • 1996-12-17
    • US567805
    • 1995-12-06
    • Hidenori Abe
    • Hidenori Abe
    • H03H9/00H03H9/02H03H9/145H03H9/64H01L41/08
    • H03H9/02543H03H9/1455H03H9/6426
    • A surface acoustic wave device comprises, on a lithium tetraborate substrate 10, a central interdigital transducer 21, 31, and first and second interdigital transducers 22, 23, 32, 33 disposed adjacently on both sides of the central interdigital transducer 21, 31 in a propagation direction of surface acoustic waves, or comprises a first such row of transducers 20 and a second such row of transducers 30 connected in cascade to each other. A sum Nc+Ns of a number of the central interdigital transducer pairs Nc, and a total number of the first and second interdigital transducers pairs Ns is set at a suitable range. The surface acoustic wave device has flat group delay times, relatively wide specific band widths, small insertion losses and large attenuation outside the pass band.
    • 表面声波装置在四硼酸锂基板10上包括中央叉指式换能器21,31以及相邻设置在中央叉指式换能器21,31的两侧上的第一和第二叉指式换能器22,23,32,33, 表面声波的传播方向,或者包括彼此级联连接的第一这样的换能器行20和第二排换能器30。 多个中央叉指式换能器对Nc的总和Nc + Ns以及第一和第二指数间换能器对Ns的总数被设定在合适的范围。 声表面波器件具有平坦的延迟时间,相对宽的特定带宽,小的插入损耗和通带外的大的衰减。
    • 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。