| 摘要 |
In the piezoelectric ceramic filter according to the invention, two (4, 5 and 6, 7) each of four rod-shaped piezoelectric ceramic resonators (4, 5, 6, 7) are arranged in one recess (2, 3) each of an insulating-material plate (1) which carries three metallisations (8, 9, 10) on one side. Of the three metallisations (8, 9, 10), two (9, 10) are connected to one ceramic resonator (4, 7) each, arranged in one recess (2, 3) each, and the third metallisation (8) is connected to two ceramic resonators (5, 6) arranged in one recess (2, 3) each. The connections are made by wires (11, 12, 13) which are mounted in resonance nodes of the ceramic resonators (4, 5, 6, 7). On the opposite side, at least the two ceramic resonators (4, 5 and 6, 7) arranged in a recess (2, 3) of the insulating-material plate (1) are mechanically coupled to one another by coupling wires (15) arranged outside the resonance node. The coupling wires (15) can form at the same time the feedline to the opposite electrode of the resonators. The recesses (2, 3) in the insulating-material plate (1) can be arranged both adjacent to one another and opposite to one another. <IMAGE>
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