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    • 4. 发明公开
    • 필터
    • 过滤
    • KR1020080066555A
    • 2008-07-16
    • KR1020080000111
    • 2008-01-02
    • 후지쓰 메디아 데바이스 가부시키가이샤
    • 오노사토루카와치오사무쿠보이히데미츠오오쿠보코우타
    • H03H9/64
    • H03H9/0057H03H9/14597H03H9/6433H03H9/6469H03H9/6473H03H9/76
    • A filter is provided to perform an impedance matching simply by adjusting an opening length of two multi-mode filters. A filter includes a first elastic wave(10), and a second elastic wave(20). The first elastic wave is dependently coupled to the second elastic wave. The first elastic wave filter has an input terminal of a first multi-mode filter. The second elastic filter has an input terminal of a second multi-mode filter having a different opening length from the first multi-mode filter. The second elastic filter receives an unbalanced signal such as the first elastic filter. The second elastic filter has a pass band which is not overlapped with the fist elastic filter. At least one side of the first elastic filter and the second elastic filter has a balanced output. Two output signals of the balanced output have a different phase of 180°.
    • 提供滤波器以简单地通过调节两个多模滤波器的开口长度来执行阻抗匹配。 滤波器包括第一弹性波(10)和第二弹性波(20)。 第一弹性波依赖地耦合到第二弹性波。 第一弹性波滤波器具有第一多模滤波器的输入端。 第二弹性滤波器具有与第一多模式滤波器不同的开口长度的第二多模式滤波器的输入端。 第二弹性滤波器接收诸如第一弹性滤波器的不平衡信号。 第二弹性滤波器具有与第一弹性滤波器不重叠的通带。 第一弹性过滤器和第二弹性过滤器的至少一侧具有平衡的输出。 平衡输出的两个输出信号具有180°的不同相位。