Electrode joint structure and manner of multipolar monolithic crystal filter

摘要

(57) Abstract The multipolar monolithic crystal filter has three which is joined acoustic resonators (50,52,54) at least with respect to piezoelectric body blank (56). Each resonator (50,52,54) the top which it is related and has had the lower part electrode (70,72,74,76,78,80). Entry joint (62) is joined by the upper electrode (70) of the 1st resonator (50), earthing connection (64) is joined to the lower part electrode (72) of the 1st resonator (50). Output joint (68) is joined by the lower part electrode (80) of the last resonator (54), earthing connection (66) is joined to the upper electrode (78) of the last resonator (54). Top of the remaining each resonator (52) and the lower part electrode (74,76) is joined mutually.