Ladder filter with piezoresonators and folded electrode terminals stacked in a case

摘要

A ladder filter has a terminal which has a first electrode portion and a second electrode portion which is folded back on the first electrode portion, the first electrode portion and the second electrode portion having a first projection and a second projection respectively which are in contact with piezoresonators. The folding position of the second electrode portion and the whole second electrode portion are inside peripheral sides of the piezoresonators. The second projection is lower than the first projection.