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    • 6. 发明授权
    • Multimode surface acoustic wave filter with a coupling section not being
a uniform metal film
    • 具有耦合部分的多模表面声波滤波器不是均匀的金属膜
    • US06121860A
    • 2000-09-19
    • US831332
    • 1997-03-31
    • Jun TsutsumiOsamu IkataYoshio Satoh
    • Jun TsutsumiOsamu IkataYoshio Satoh
    • H03H9/145H03H9/00H03H9/64
    • H03H9/6479H03H9/0028H03H9/643H03H9/6463
    • The multimode surface acoustic wave filter includes two surface acoustic wave resonators closely arranged on a piezoelectric substrate in a direction perpendicular to the propagation direction of surface acoustic waves and acoustically coupled by a coupling section, each of the surface acoustic wave resonators including an interdigital transducer and two reflectors disposed closely on both sides of the interdigital transducer in a direction parallel to the propagation direction of the surface acoustic waves, the interdigital transducer having an excitation section for exciting the surface acoustic waves and a signal terminal section for inputting an electric signal, each of the reflectors having a grating section and a terminal section, wherein the velocity of surface acoustic waves propagating through the coupling section is a little larger than the velocity of the surface acoustic waves propagating through the excitation section of the interdigital transducer.
    • 多模声表面波滤波器包括两个表面声波谐振器,其紧密地布置在压电基片上,在与声表面波的传播方向垂直的方向上,并由耦合部分声学耦合,每个声表面波谐振器包括一指叉式换能器和 两个反射器在平行于表面声波的传播方向的方向上紧密地布置在叉指式换能器的两侧上,叉指换能器具有用于激励表面声波的激励部分和用于输入电信号的信号端子部分 具有光栅部分和端子部分的反射器,其中通过耦合部分传播的表面声波的速度比通过叉指换能器的激励部分传播的表面声波的速度稍大。
    • 7. 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°。