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LOADED SERIES RESONATORS FOR ADJUSTING FREQUENCY RESPONSE OF ACOUSTIC WAVE RESONATORS
LOADED SERIES RESONATORS FOR ADJUSTING FREQUENCY RESPONSE OF ACOUSTIC WAVE RESONATORS
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机译:负载串联谐振器,用于调节声波谐振器的频率响应
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摘要
An acoustic wave filter device (710) is disclosed. The device includes an acoustic wave filter element (100), and a first resonator (702) and a second resonator (712) coupled to the acoustic wave filter element. The acoustic wave filter element includes interdigitated input electrodes (150) and output electrodes (170) located on a top surface of a piezoelectric layer (110). Each of the first and the second resonators includes a top electrode (732, 734) on the top surface, and a bottom electrode (736, 738) on the bottom surface of the piezoelectric layer. At least one of each of the first and the second resonators' electrodes is electrically connected to the acoustic wave filter element. The first resonator has a first notch in resonator impedance at a first frequency. The second resonator includes a first mass loading layer (750) on the second resonator electrode such that the second resonator has a second notch in resonator impedance at a second frequency different from the first frequency.
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