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    • 6. 发明专利
    • Filter, portable terminal, and electronic component
    • 过滤器,便携式终端和电子元件
    • JP2010035132A
    • 2010-02-12
    • JP2009024581
    • 2009-02-05
    • Nippon Dempa Kogyo Co Ltd日本電波工業株式会社
    • ONZUKA TATSUNORI
    • H03H9/64H03H9/17H03H9/24H03H9/54H03H9/58H04B1/16
    • H03H7/075H03H7/1758H03H9/542H03H9/547H03H9/605H03H9/6409H03H9/6483
    • PROBLEM TO BE SOLVED: To obtain sharp and high attenuation in the attenuation ranges close to each other outside of the TV radio wave band and to provide a filter for suppressing the number of inductors used and contributing to device miniaturization.
      SOLUTION: A plurality of elastic wave resonators connected in the form of parallel arms for forming a plurality of attenuation ranges are connected to the isopotential points of a signal path without any inductor. Alternatively, series circuits of a plurality of element sections which cause series resonance are connected to the signal path as the parallel arms. Thus, high attenuation is achieved in each of the attenuation ranges. However, ranges equivalent to, as it were, zero points exist between the adjacent poles. However, even if the zero points exist, a characteristic of sharply attenuating at both sides of each zero point is achieved. Pairs of the elastic wave resonators (pairs of resonators) connected to the isopotential points or the parallel arms consisting of the series circuits are cascade-connected to the signal path and inductors for inverting the phases are interposed between the arms.
      COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:为了在TV无线电波段外部彼此接近的衰减范围获得锐利和高的衰减,并且提供用于抑制所使用的电感器的数量并有助于器件小型化的滤波器。 解决方案:以并联臂形式连接形成多个衰减范围的多个弹性波谐振器连接到信号路径的等势点,而没有任何电感器。 或者,引起串联谐振的多个元件部分的串联电路作为并联臂连接到信号路径。 因此,在每个衰减范围内实现高衰减。 然而,相邻极点之间存在相当于零点的范围。 然而,即使存在零点,也可以实现在每个零点的两侧急剧衰减的特性。 连接到等势点的弹性波谐振器(谐振器对)与由串联电路组成的并联臂的对成对地连接到信号路径,并且用于反相的电感器插入在臂之间。 版权所有(C)2010,JPO&INPIT