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    • 82. 发明授权
    • Piezoelectric thin-film resonator and filter using the same
    • 压电薄膜谐振器和使用其的滤波器
    • US07602101B2
    • 2009-10-13
    • US11976608
    • 2007-10-25
    • Motoaki HaraTokihiro NishiharaMasanori UedaGo Endo
    • Motoaki HaraTokihiro NishiharaMasanori UedaGo Endo
    • H01L41/047
    • H03H9/174H03H3/04H03H9/13H03H9/132H03H9/173H03H9/568H03H2003/023
    • A piezoelectric thin-film resonator includes: a lower electrode supported by a substrate, a space being defined below the lower electrode; a piezoelectric film provided on the lower electrode and the substrate; and an upper electrode provided on the piezoelectric film so as to form a resonance portion in which the upper electrode faces the lower electrode across the piezoelectric film. At least one of the lower electrode and the upper electrode has an interconnection portion used to extract a signal from the resonance portion and located above the space. The at least one of the lower electrode and the upper electrode has a first mass per unit area in which the at least one of the lower electrode and the upper electrode contacts the piezoelectric film and a second mass per unit area in the resonance portion. The first mass per unit area is smaller than the second mass per unit area.
    • 压电薄膜谐振器包括:由基板支撑的下电极,在下电极下方限定空间; 设置在下电极和基板上的压电膜; 以及设置在压电膜上的上电极,以形成谐振部分,其中上电极面向下电极穿过压电膜。 下电极和上电极中的至少一个具有用于从谐振部分提取信号并位于空间上方的互连部分。 下电极和上电极中的至少一个具有每单位面积的第一质量,其中下电极和上电极中的至少一个与压电膜接触,并且在谐振部分中每单位面积具有第二质量。 每单位面积的第一个质量小于每单位面积的第二个质量。