| 摘要 |
PROBLEM TO BE SOLVED: To obtain means for suppressing spurious response frequencies which are generated in the high frequency side of passband of a cascade-connected double mode piezoelectric filter composed by arranging two double mode piezoelectric filters in one piece of piezo substrate. SOLUTION: In the cascade-connected double transmission mode piezoelectric filter in which two double mode filters are arranged on the piezo substrate to connect them, the depth and width dimensions of an electrode which is arranged on the backside of one double mode piezoelectric filter are made substantially more than two times of the depth and width dimensions of two facing electrodes.
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