| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric thin film filter with a broad bandwidth and a low loss that copes with high frequencies. SOLUTION: The filter is characterized in that it consists of piezoelectric resonators electrically connected to each other, placed on a single substrate 11 and each having a laminator comprising thin film piezoelectric bodies and electrodes and at least parts of the electrodes being components of each piezoelectric resonator are made of Au, each piezoelectric body is formed with piezoelectric polarized bodies 14, 16 made of ferroelectric bodies and the polarization direction of the adjacent piezoelectric polarized bodies 14, 16 differs from each other.
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