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    • 2. 发明授权
    • Surface acoustic wave filter
    • 表面声波滤波器
    • US4939487A
    • 1990-07-03
    • US219250
    • 1988-07-15
    • Akitsuna YuharaHitoshi WatanabeJun YamadaTetsuya Hirashima
    • Akitsuna YuharaHitoshi WatanabeJun YamadaTetsuya Hirashima
    • H03H3/08H03H9/145H03H9/64
    • H03H9/6426H03H9/1455
    • When SAW filter is used as a receiving filter of an antenna duplexer filter in a cellular radio equipment, since a transmitting signal of an out-band frequency has a large power for the SAW filter, the large power can leak into the SAW filter to generate inter-modulation disturbances in the SAW filter. Since the inter-modulation disturbances are generated when the transmission power density of the surface acoustic wave is made too large, input converters are divided, and the divided converters are disposed in the direction perpendicular to the propagation direction of the surface acoustic wave to lower the transmission power density. Since the divided converters are connected in series, reduction in the impedence together with increase of the aperture length can be compensated.
    • 当在蜂窝无线电设备中使用SAW滤波器作为天线双工器滤波器的接收滤波器时,由于带外频率的发射信号对SAW滤波器具有较大的功率,因此大功率可能泄漏到SAW滤波器中以产生 SAW滤波器中的互调扰动。 由于当声表面波的发射功率密度变得太大时产生互调扰乱,所以输入转换器被分割,并且分离的转换器被设置在与声表面波的传播方向垂直的方向上,以降低 传输功率密度。 由于分频转换器串联连接,可以补偿阻抗的减小以及孔径长度的增加。
    • 5. 发明授权
    • Surface elastic wave device
    • 表面弹性波装置
    • US4689586A
    • 1987-08-25
    • US869979
    • 1986-06-02
    • Jun YamadaAkitsuna YuharaTakashi ShibaYuji Fujita
    • Jun YamadaAkitsuna YuharaTakashi ShibaYuji Fujita
    • H03H9/02H03H9/145H03H9/42
    • H03H9/14505
    • A surface acoustic wave (SAW) device comprises a piezo-electric surface acoustic substrate, and plural sets of input/output interdigital electrodes disposed on the substrate. A phase shifter is provided between a sending electrode and a reflecting electrode included in the input or output interdigital electrodes for producing an electrical phase difference to implement a unidirectional electrode. The sending electrode and the reflecting electrode are mutually connected through the phase shifter including two pure reactance elements serially connected between the sending and the reflecting electrodes and a pure reactance element connected to the junction between the two serially connected reactance elements so as to form a T-circuit. When the two serially connected pure reactance elements are selected equal to each other, the operating frequency band is broadened. The phase shifter includes no ohmic resistance and thus is lossless.
    • 表面声波(SAW)器件包括压电表面声学衬底和设置在衬底上的多组输入/输出叉指电极。 在发送电极和包括在输入或输出叉指电极中的反射电极之间提供移相器,用于产生电相差以实现单向电极。 发送电极和反射电极通过移相器相互连接,该移相器包括串联连接在发送电极和反射电极之间的两个纯电抗元件和连接到两个串联的电抗元件之间的接点的纯电抗元件,从而形成T 电路 当选择两个串联的纯电抗元件彼此相等时,工作频带变宽。 移相器不包含欧姆电阻,因此无损耗。