| 摘要 |
<p>A multilayer type piezoelectric filter (F) is provided which includes at least two chambers (6a, 6b or 6b, 6c) for receiving therewithin resonators (S, P or P, S), respectively. The chambers (6a, 6b or 6b, 6c) are partly defined by a top printed circuit board (4) and an intermediate printed circuit board (3a or 3b). The top printed circuit board (4) and the intermediate printed circuit board (3a or 3b) are formed with communication holes (20, 21a or 21b) for communicating the chambers (6a, 6b or 6b, 6c) with the outside.</p> |
