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    • 11. 发明授权
    • Surface acoustic wave device with an angle .alpha. related to specific
piezoelectric substrates
    • 具有与特定压电基板相关的角度α的表面声波装置
    • US6075426A
    • 2000-06-13
    • US153336
    • 1998-09-15
    • Jun TsutsumiTakashi MatsudaOsamu IkataYoshio Satoh
    • Jun TsutsumiTakashi MatsudaOsamu IkataYoshio Satoh
    • H03H9/145H03H9/64
    • H03H9/14552H03H9/6426
    • A surface acoustic wave device includes a piezoelectric substrate and plural IDTs for sending and receiving SAW mounted on the substrate. At least one of the IDTs includes a positive electrode including plural positive split electrodes (PSEs) and a negative electrode including plural negative split electrodes (NSEs). The PSEs and NSEs are arranged alternately. Each of the PSEs andNSEs has apair of electrode fingers. Two electrode fingers of each of the split electrodes are different in width in a direction in which a SAW is excited. An angle .alpha. determined by a direction transverse to the electrode fingers from one of the two electrode fingers having a smaller reflection factor toward the other one having a larger reflection factor and a direction in which the SAW excited by the IDT including the split electrodes travels to one of the IDTs for receiving the SAW is equal to or larger than 0.degree. and smaller than 90.degree., i.e., 0.ltoreq..alpha.
    • 表面声波装置包括压电基板和用于发送和接收安装在基板上的SAW的多个IDT。 IDT中的至少一个包括包括多个正分裂电极(PSE)的正电极和包括多个负分离电极(NSE)的负电极。 PSEs和NSEs交替排列。 每个PSE和NSE都有电极指的孔。 每个分离电极的两个电极指在SAW被激发的方向上的宽度不同。 由横向于电极指的方向由具有较小反射系数的两个电极指的另一个具有较大反射系数的方向确定的角度α和由包括分离电极的IDT激发的SAW的方向传播到 用于接收SAW的IDT之一等于或大于0°并小于90°,​​即0 <α<90°。
    • 15. 发明授权
    • Saw resonator with improved connections
    • 具有改进连接的锯片谐振器
    • US5955933A
    • 1999-09-21
    • US640948
    • 1996-05-15
    • Tokihiro NishiharaYoshio SatohHidema UchishibaTakashi MatsudaOsamu Ikata
    • Tokihiro NishiharaYoshio SatohHidema UchishibaTakashi MatsudaOsamu Ikata
    • H03H9/02H03H9/145H03H9/64H03H9/25H03H9/52
    • H03H9/6483H03H9/02944H03H9/145H03H9/64H03H9/02984
    • In a surface acoustic wave filter constituted with a ladder of resonators having a resonance frequency or an anti-resonance frequency, an input current flowing into a resonator in a parallel arm at the first stage from the input is so large as to deteriorate its lifetime caused from a heat generation by the resistance of the thin film wiring. As a measure to this problem, bonding wires (30, 31) connected onto points on connection electrodes (130, 131) for connecting an end of each of plural comb teeth electrodes 111 forming the resonators R.sub.s1 & R.sub.p1, or on a lead conductor (130-1) extended longitudinally from the connection electrode, are allotted at both sides of a center line (C1) of the plural comb teeth electrode group. Furthermore, a bonding wire may be connected substantially onto the center line C1 as well. It is preferable for the bonding wires to be located substantially symmetric with respect to the center line C1. It is preferable that the width along the longitudinal direction of the comb teeth electrodes is larger than a width of the comb teeth electrode.
    • PCT No.PCT / JP95 / 02293 Sec。 371日期:1996年5月15日 102(e)日期1996年5月15日PCT提交1995年11月10日PCT公布。 公开号WO96 / 15587 日期:1996年5月23日在由具有共振频率或反共振频率的谐振器的梯形构成的表面声波滤波器中,从输入端流入到并联臂的第一级的并联臂的谐振器的输入电流大到 由于薄膜布线的电阻而产生的热量使其寿命恶化。 作为这个问题的一个措施,连接在连接电极(130,131)上的点上的接合线(30,31)用于连接形成谐振器Rs1和Rp1的多个梳齿电极111的端部,或引线导体 130-1)从连接电极纵向延伸,分配在多个梳齿电极组的中心线(C1)的两侧。 此外,接合线也可以基本上连接在中心线C1上。 接合线优选相对于中心线C1大致对称。 梳齿电极的沿长度方向的宽度优选大于梳齿电极的宽度。
    • 20. 发明授权
    • Surface acoustic wave filter having plural propagation paths and a coupler
    • 具有多个传播路径的表面声波滤波器和耦合器
    • US06577210B1
    • 2003-06-10
    • US09659592
    • 2000-09-11
    • Jun TsutsumiTakashi MatsudaOsamu IkataYoshio Satoh
    • Jun TsutsumiTakashi MatsudaOsamu IkataYoshio Satoh
    • H03H964
    • H03H9/64
    • The present invention relates to a surface acoustic wave filter which is characterized in that it includes a piezoelectric substrate, a plurality of surface acoustic wave propagation paths arranged in parallel on the piezoelectric substrate and a coupler for coupling the surface acoustic wave propagation paths, an input interdigital transducer and a first reflector are disposed on at least one of the surface acoustic wave propagation paths with intervention of the coupler, and an output interdigital transducer and a second reflector are disposed on at least one of the other surface acoustic wave propagation paths with intervention of the coupler. This construction can reduce the length of the surface acoustic wave filter in a surface acoustic wave propagation direction and can improve the shape factor of a frequency characteristic curve.
    • 声表面波滤波器技术领域本发明涉及一种声表面波滤波器,其特征在于,它包括压电基片,压电基片上平行布置的多个表面声波传播路径和用于耦合表面声波传播路径的耦合器,输入 叉指换能器和第一反射器通过耦合器的介入设置在表面声波传播路径中的至少一个上,并且输出叉指式换能器和第二反射器设置在至少一个其它表面声波传播路径上,并具有干预 的耦合器。 这种结构可以降低表面声波滤波器在表面声波传播方向上的长度,并且可以改善频率特性曲线的形状因子。