Surface acoustic wave device
    5.
    发明授权
    Surface acoustic wave device 失效
    表面声波装置

    公开(公告)号:US5302877A

    公开(公告)日:1994-04-12

    申请号:US29514

    申请日:1993-03-11

    CPC分类号: H03H9/02543

    摘要: A surface acoustic wave device comprises lithium tetraborate single crystal substrate to make use of surface acoustic waves with higher propagation velocities and smaller propagation losses, whereby frequencies to be signal-processed can be as high as above 1 GHz. The surface acoustic wave device comprises a metal film formed on a surface of a lithium tetraborate single crystal substrate, the metal film being for exciting, receiving, reflecting and/or propagating surface acoustic waves, the metal film being so formed that a cut angle of the substrate, and a propagation direction of the surface acoustic waves are in an Eulerian angle representation of (39.degree.-51.degree., 66.degree.-114.degree., -20.degree.-20.degree.) and directions equivalent thereto. In this propagation direction few Rayleigh waves exit, and only surface acoustic waves of high propagation velocity are generated. Propagation losses can be eliminated.

    摘要翻译: 表面声波装置包括四硼酸锂单晶基板,以利用具有较高传播速度和较小传播损耗的表面声波,由此待信号处理的频率可高达1GHz以上。 表面声波装置包括形成在四硼酸锂单晶基板的表面上的金属膜,金属膜用于激发,接收,反射和/或传播表面声波,金属膜被形成为使得金属膜的切割角度 衬底和表面声波的传播方向处于(39度-51度,66度-114度,-20度-20度)和与此相当的方向的欧拉角度表示。 在这个传播方向上,很少的瑞利波出射,只有高传播速度的表面声波才产生。 传播损失可以消除。

    Surface acoustic wave device
    6.
    发明授权
    Surface acoustic wave device 失效
    表面声波装置

    公开(公告)号:US5434465A

    公开(公告)日:1995-07-18

    申请号:US236015

    申请日:1994-05-02

    IPC分类号: H03H9/25 H03H9/02 H01L41/08

    CPC分类号: H03H9/02543

    摘要: A surface acoustic wave device comprises a piezoelectric substrate of lithium tetraborate single crystal, and a metal film formed on the surface of the piezoelectric substrate for exciting, receiving, reflecting and/or propagating surface acoustic waves, the metal film being so formed that a cut angle of the surface of the piezoelectric substrate and propagation direction of the surface acoustic wave are an Eulerian angle representation of (0.degree.-45.degree., 30.degree.-90.degree., 40.degree.-90.degree.) and directions equivalent thereto, the surface acoustic wave having higher propagation velocity than Rayleigh waves and leaky waves, and a characteristic of radiating part of energy of the surface acoustic wave into the piezoelectric surface while propagating.

    摘要翻译: 表面声波装置包括四硼酸锂单晶的压电基板和形成在压电基板的表面上用于激发,接收,反射和/或传播表面声波的金属膜,金属膜被形成为切割 压电基板表面的角度和表面声波的传播方向是(0°-45°,30°-90°,40°-90°)和与其等效的方向的欧拉角表示,表面声波 具有比瑞利波和泄漏波更高的传播速度,以及在传播时将表面声波的能量的一部分辐射到压电表面中的特性。

    Surface acoustic wave filter with optimally sized gaps between
transducers
    9.
    发明授权
    Surface acoustic wave filter with optimally sized gaps between transducers 失效
    表面声波滤波器,在传感器之间具有最佳尺寸的间隙

    公开(公告)号:US5877661A

    公开(公告)日:1999-03-02

    申请号:US737372

    申请日:1997-06-17

    IPC分类号: H03H9/00 H03H9/64

    摘要: 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.

    摘要翻译: 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。