Resonator filter based on surface acoustic waves e.g. bandpass filter, has two or more one-port resonator structures and planar cavities of differing lengths

摘要

The filter has several adjacent one-port resonator structures (2,3,4) on a piezoelectric substrate. The number of one-port resonator structures is greater than two. The length of a planar cavity (24) of at least one one-port resonator structure differs from the length of the remaining planar cavities.