| 摘要 |
An energy-trap piezoelectric resonator utilizing thickness extensional vibration includes a piezoelectric substrate and first and second resonance electrodes. The piezoelectric substrate is polarized in the thickness direction thereof and has first and second main surfaces. The first resonance electrode is partially disposed on the first main surface of the piezoelectric substrate, and the second resonance electrode is partially disposed on the second main surface of the piezoelectric substrate. The second resonance electrode is arranged to oppose the first resonance electrode with the piezoelectric substrate disposed therebetween and has an external dimension that is different from that of the first resonance electrode.
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