| 摘要 |
A piezoelectric filter includes a first three-terminal filter having a first input part and a first output part, a second three-terminal filter which has a second input part connected to the first output part and a second output part, a ground part, a relay capacitance connected between the first output part, the second input part, and the ground part, and an additional capacitance connected between the first or second input part and the first or second output part.
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