Patent ID: 7504911

Claim:
A surface acoustic wave resonator comprising a plurality of IDT electrodes arranged on a piezoelectric substrate along a propagation direction of a surface acoustic wave propagating on the piezoelectric substrate and each having a number of electrode fingers extending in a direction perpendicular to the propagation direction, wherein the IDT electrodes comprise a first IDT electrode and a second IDT electrode adjacent to the first IDT electrode, wherein both the first IDT electrode and second IDT electrode comprise a first pitch section and a second pitch section, wherein said second pitch section is closer to a boundary between than the first and second IDT electrodes than the first pitch section, wherein the second pitch section of the first IDT electrode comprises a minimum pitch portion and a first non-minimum pitch portion, wherein the minimum pitch portion has the shortest electrode finger pitch of the first and the second IDT electrodes, and wherein the first non-minimum pitch portion is placed closer to the boundary between the first and the second IDT electrodes than the minimum pitch portion.