ELASTIC SURFACE WAVE FILTER

摘要

An elastic surface wave filter includes a piezoelectric substrate (201) on which a first IDT (202) and a second IDT (203) are formed. The first IDT (202) is arranged between one terminal (204) of the I/O terminals and the other terminal (205) of the I/O terminals, i.e., in series to a signal path. The second IDT (203) is arranged in parallel to the signal path from a portion between the one terminal (204) of the I/O terminals and the first IDT (202). Furthermore, the first IDT (202) and the second IDT (203) are arranged in proximity to each other on the same propagation path of the elastic surface wave excited by their respective resonators.