Patent ID: 7408429

Claim:
A coupled FBAR filter, comprising: a vibration portion including at least a first input/output vibration portion and a second input/output vibration portion which are located adjacently in contact with each other, wherein the first input/output vibration portion includes a first lower electrode, a first upper electrode, and a part of a piezoelectric portion interposed therebetween, and the second input/output vibration portion includes a second lower electrode, a second upper electrode, and a part of the piezoelectric portion interposed therebetween; a common vibration guaranteeing portion, having the vibration portion provided thereon, for commonly guaranteeing at least a vibration of the first input/output vibration portion and a vibration of the second input/output vibration portion so as to couple the plurality of vibrations; and at least one insulator for forming a stepped portion for electrically insulating at least either the first lower electrode and the second lower electrode from each other, or the first upper electrode and the second upper electrode from each other.