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    • 4. 发明公开
    • Surface acoustic wave filter, balanced type filter and communication device
    • AkustischesOberflächenwellenfilter,对称筛选和公共关系
    • EP1263137A3
    • 2011-08-03
    • EP02011843.6
    • 2002-05-28
    • Panasonic Corporation
    • Nakamura, HiroyukiMita, NarihiroTsuzuki, ShigeruYamada, Toru
    • H03H9/64
    • H03H9/0042H03H9/0038H03H9/0061H03H9/02952H03H9/14588
    • (Problems)
      There is a problem of degradation in balance characteristics with a longitudinal mode type surface acoustic wave filter having unbalanced-balanced type terminals.
      (Constitution)
      A longitudinal mode type surface acoustic wave filter comprising a first IDT electrode 102, second and third IDT electrodes 103 and 104, and first and second reflector electrodes 105 and 106 is formed on a piezoelectric substrate 101. The upper electrode 102a of the first IDT electrode 102 is connected to one of balanced type terminals 107, and the lower electrode 102b of the first IDT electrode 102 is connected to the other balanced type terminal 108. Also, the lower electrode 103a of the second IDT electrode 103 is connected to an unbalanced type terminal 109, and the lower electrode 103b is grounded. The lower electrode 104b of the third IDT electrode 104 is connected to the unbalanced type terminal 109, and the upper electrode 103a is grounded.
    • (问题)具有不平衡型端子的纵模式表面声波滤波器存在平衡特性劣化的问题。 (构成)在压电基板101上形成包括第一IDT电极102,第二和第三IDT电极103,104以及第一和第二反射器电极105和106的纵向模式型表面声波滤波器。 第一IDT电极102连接到平衡型端子107中的一个,并且第一IDT电极102的下部电极102b连接到另一个平衡型端子108.另外,第二IDT电极103的下部电极103a连接到 不平衡型端子109,下电极103b接地。 第三IDT电极104的下部电极104b与不平衡型端子109连接,上部电极103a接地。