| 摘要 |
PURPOSE:To obtain a piezoelectric porcelain filter provided with the construction of axial symmetry and enabled to use the same components without causing short-circuit due to a capillary tube phenomenon, even if components are mutually bonded with a conductive adhesives. CONSTITUTION:Input and output resonance electrodes 1a, 1b split at the side of piezoelectric element chips and input and output electrodes 2a, 2b for leads are provided with baking or vacuum-deposition. The other element chip is symmetrically provided with resonance electrodes 1c, 1d and output electrodes 2c, 2d for leads. The upper side of the element chips is provided with common electrodes 3a, 3b to connect piezoelectric elements 10, 11 to the other components. The back side of the chips is provided with earth electrodes 4a, 4b at the surface corresponding to the electrodes 1a, 1b, 1c and 1d. |
