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    • 24. 发明申请
    • TUNABLE Q RESONATOR
    • 可调谐Q谐振器
    • WO2015084456A2
    • 2015-06-11
    • PCT/US2014/056397
    • 2014-09-18
    • THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    • NGUYEN, Clark T.-C.SCHNEIDER, Robert A.
    • H02N2/04
    • H03H9/467H03H9/02259H03H9/02409H03H9/02425H03H9/17H03H9/2436H03H9/505H03H9/54H03H9/58H03H2009/02503
    • A tunable Q resonator using a capacitive-piezoelectric transducer provides a flexible top electrode above an AlN resonator. The top electrode can be pulled electrostatically towards the resonator and substrate, forming a frictional contact with either the resonator or the combined resonator-electrode structure to the substrate, allowing for electrical tuning the Q of the resonator. With a sufficient electrostatic bias voltage Vb, the resonator may be completely turned OFF, allowing for an integrated switchable AlN resonator. Such switchable resonator may be integrated into a radio frequency (RF) front end as a digitally selectable band pass filter element, obviating the need for ancillary micromechanical switches in the signal path. The device has been demonstrated with a Q approaching 9,000, together with ON/OFF switchability and electromechanical coupling up to 0.63%. Flexible positioning of the top electrode allows for actively controlling the series resonant frequency of the resonator through changes in capacitive coupling.
    • 使用电容压电换能器的可调Q谐振器在AlN谐振器上方提供了柔性顶部电极。 顶部电极可以朝着谐振器和基板静电拉伸,与谐振器或组合谐振器电极结构形成与基板的摩擦接触,允许电谐调谐振器的Q. 利用足够的静电偏压Vb,谐振器可以完全关闭,从而允许集成可切换AlN谐振器。 这样的可切换谐振器可以作为数字可选带通滤波器元件集成到射频(RF)前端中,从而不需要信号路径中的辅助微机械开关。 该器件的Q值接近9,000,并具有ON / OFF可切换性和0.63%的机电耦合。 顶部电极的灵活定位允许通过电容耦合的变化主动控制谐振器的串联谐振频率。