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    • 31. 发明授权
    • High frequency narrow-band multi-mode filter
    • 高频窄带多模滤波器
    • US4542356A
    • 1985-09-17
    • US517511
    • 1983-07-26
    • Yuzo NakazawaKazuo OnoMasaki TanakaTakao MoritaTakefumi Kurosaki
    • Yuzo NakazawaKazuo OnoMasaki TanakaTakao MoritaTakefumi Kurosaki
    • H03H3/08H03H9/02H03H9/145H03H9/25H03H9/64
    • H03H9/6433H03H9/02944H03H9/1455H03H9/6463
    • A high frequency narrow-band pass multi-mode filter in constructed in such manner that SAW of SSBW resonators are closely disposed to each other on a single piezo-electric substrate to generate different vibration modes of different resonance frequencies, conditions that the resonators are acoustically coupled to each other to cause these vibration modes, are experimentally found, and the above conditions are satisfied by the filter.In order to reduce the ohmic loss of a very narrow common bus bar, the number of strip pairs of electrode in both interdigital transducers (hereinafter referred to as IDT) is minimized and instead reflectors are provided on the both sides of said TDTs to compensate for the reduction of its Q value. A part of the bus bar for the IDT electrodes is formed integral with some or all of gratings of the reflectors, whereby the connecting positions of the grating electrodes with respect to lead terminals can be positioned with a high freedom.
    • 一种高频窄带通多模滤波器,其结构使得SSBW谐振器的SAW在单个压电基板上彼此紧密地布置,以产生不同谐振频率的不同振动模式,声谐振器的条件 彼此耦合以引起这些振动模式,通过实验发现,并且上述条件由滤波器满足。 为了减小非常狭窄的公共母线的欧姆损耗,两个叉指式换能器(以下称为IDT)中的电极条形对数量被最小化,并且反射器设置在所述TDT的两侧以补偿 降低其Q值。 用于IDT电极的母线的一部分与反射器的一些或全部光栅形成一体,由此可以高度自由地定位光栅电极相对于引线端子的连接位置。