| 摘要 |
A chip piezoelectric filter has a plurality of energy-trap piezoelectric filters and effectively minimizes unnecessary spurious components in areas other than passbands. In the chip piezoelectric filter, first and second piezoelectric substrates on which first and second energy-trap piezoelectric filter sections are provided, respectively, are stacked on each other and separated from each other via a spacer. Also, first and second housing substrates are individually stacked on upper and lower portions of the first and second piezoelectric substrates. A first cavity is provided in the spacer to prevent interference of vibrations of the first and second piezoelectric substrates. The area of the first cavity is larger than the area of each of second and third cavities individually formed on outer surfaces of the first and second piezoelectric substrates.
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