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    • 2. 发明授权
    • Multiple-stage ladder type SAW filter having series resonators with
decreasing electrode pitches
    • 具有串联谐振器的多级梯型SAW滤波器具有减小的电极间距
    • US6031435A
    • 2000-02-29
    • US239961
    • 1999-01-29
    • Naoto InoseHok Huor Ou
    • Naoto InoseHok Huor Ou
    • H03H9/25H03H3/08H03H9/64
    • H03H9/6483H03H3/08
    • In a multiple stage ladder type SAW filter constructed by cascade-connecting several SAW resonators in the form of a multiple-stage ladder, the electrode pitches of the first stage series-arm SAW resonator through the last stage series-arm SAW resonator, respectively, are gradually decreased. In this case, each stage has a series-arm SAW resonator and a shunt-arm SAW resonator. As a result, the resonance frequencies of the first stage series-arm SAW resonator through the last stage series-arm SAW resonator are increased monotonically from the first stage to the last stage. As a consequence, the frequencies of the upper poles of attenuation generated by the series-arm SAW resonators differ from each other. Therefore, a desired amount of attenuation can be obtained over a wide band.
    • 在通过级联多个阶梯形式的多个SAW谐振器构成的多级梯型SAW滤波器中,分别通过最后级串联臂SAW谐振器的第一级串联SAW谐振器的电极间距, 逐渐减少。 在这种情况下,每个级具有串联臂SAW谐振器和分流臂SAW谐振器。 结果,通过最后一级串联臂SAW谐振器的第一级串联SAW谐振器的谐振频率从第一级到最后阶段单调地增加。 结果,由串联臂SAW谐振器产生的衰减的上极的频率彼此不同。 因此,可以在宽带上获得期望的衰减量。