SAW ELEMENT PIECE AND SAW DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a SAW element piece and a SAW device in which the sharpness of filter characteristics is increased and the neighborhood attenuation amount of a pass band is improved. SOLUTION: In the SAW element piece 10, a plurality of IDTs 20 arranged along the propagation direction of SAW are provided on a piezoelectric substrate 12. Then, at least one IDT 20 is provided with an electrode cell 22 for exciting the SAW and an electrode cell 24 for reflecting the SAW without exciting the SAW. The pitch La of the electrode cell 22 for exciting the SAW and the pitch Lc of the electrode cell 24 for reflecting the SAW without exciting the SAW satisfy the relation of La