| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for improving a frequency adjustment method for a high frequency triple mode piezoelectric filter. SOLUTION: In the frequency adjustment method for the high frequency triple mode piezoelectric filter, a piezoelectric board having a recessed part on one main face is user. An electrode on one edge of three electrodes on the surface and the whole electrode on the rear face function as a driving electrode, and the other electrodes are short-circuited with the whole electrode. According to the resonance characteristics offered from a one terminal pair resonator, a small mass is applied to the central electrode and a large mass is applied to the edge electrode concurrently to carry our frequency adjustment.
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