| 摘要 |
The present invention relates to a ladder type saw filter. A serial resonator is connected in series between an output terminal (Out) and an input terminal (In) on a piezoelectric wafer. A grounded parallel resonator is connected in parallel. Inter digital transducer (IDT) metal layers of the serial resonator and the parallel resonator have a thickness required for a layer thickness/period value of 0.092-0.13. [Reference numerals] (AA) Number of IDT; (BB) Film thickness (Hm); (CC) Cycle (貫) |
