| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric filter capable of easily adjusting characteristics, even if its frequency is raised to be a high frequency in the piezoelectric filter formed with a plurality of electrode configurations, each having two or more poles. SOLUTION: The piezoelectric filter comprises a ceramic package 1, a plurality of crystal oscillators 21, 22 stored in the ceramic package, and a lid 3 for forming hermetic seal of the ceramic package. Each of shield electrodes 11g, 11h is formed on the ceramic package independently, and grounding electrodes of each piezoelectric filter are not connected commonly. COPYRIGHT: (C)2005,JPO&NCIPI
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