| 摘要 |
An acoustic resonator device includes a substrate, a first acoustic resonator and a second acoustic resonator. The first acoustic resonator is formed on the substrate, and has a first upper electrode, a first piezoelectric layer, and a first lower electrode layer, and resonates in a lambda/4 mode at a first resonant frequency. The second acoustic resonator is formed on the substrate, and has a second upper electrode layer, a second piezoelectric layer, and a second lower electrode layer, and resonates in a lambda/2 mode at a second resonant frequency different from the first frequency. In the acoustic resonator device, materials and thicknesses of the first lower electrode layer and the second lower electrode layer are common and substantially equal, and materials and thicknesses of the first piezoelectric layer and the second piezoelectric layer are common and substantially equal.
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