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    • 2. 发明授权
    • Elastic wave apparatus and duplexer
    • 弹性波装置和双工器
    • US08319582B2
    • 2012-11-27
    • US13306018
    • 2011-11-29
    • Ayaka YamamotoYuichi Takamine
    • Ayaka YamamotoYuichi Takamine
    • H03H9/72H03H9/64
    • H03H9/0061H03H9/0057H03H9/725
    • An elastic wave apparatus includes a balanced-unbalanced transforming function, and an elastic wave filter and a multilayer wiring board on which the elastic wave filter is mounted. The elastic wave filter includes an unbalanced terminal and first and second balanced terminals. External electrodes used are provided on the multilayer wiring board. A first internal line connects the first balanced terminal and the external electrode. A second internal line connects the second balanced terminal and the external electrode. The lengths or shapes of the first internal line and the second internal line are set so that a capacitance used for the improvement of a balance is generated in an adjacent area A where the first internal line and the second internal line are adjacent to each other. In the adjacent area A, the directions of currents passing through the first internal line and the second internal line are the same.
    • 弹性波装置包括平衡不平衡变换功能,弹性波滤波器和安装弹性波滤波器的多层布线板。 弹性波滤波器包括不平衡端子和第一和第二平衡端子。 使用的外部电极设置在多层布线板上。 第一内部线路连接第一平衡端子和外部电极。 第二内部线路连接第二平衡端子和外部电极。 第一内部线路和第二内部线路的长度或形状被设定为在第一内部线路和第二内部线路彼此相邻的相邻区域A中产生用于改善平衡的电容。 在相邻区域A中,通过第一内部线路和第二内部线路的电流的方向相同。