| 摘要 |
Piezoelectric filter which comprises a piezoelectric substrate 10 which has an upper 15 and a lower 20 opposing main surface. A number of N-connected resonators 25, 45, 30, 50, 35, 55, 40, 60, where N is a whole number which is greater than two, are arranged on the surfaces of the substrate. A number of installation bases 320, 365 are used to connect the resonators to earth in such a way that no pair of non-adjacent resonators are connected to any base. This installation plan suppresses unwanted parasitic damping coils and improves the selectivity of the piezoelectric filter. <IMAGE> |
